CA2380444A1 - Led-based white-emitting illumination unit - Google Patents
Led-based white-emitting illumination unit Download PDFInfo
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- CA2380444A1 CA2380444A1 CA002380444A CA2380444A CA2380444A1 CA 2380444 A1 CA2380444 A1 CA 2380444A1 CA 002380444 A CA002380444 A CA 002380444A CA 2380444 A CA2380444 A CA 2380444A CA 2380444 A1 CA2380444 A1 CA 2380444A1
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- Prior art keywords
- white
- emitting
- illumination unit
- led
- phosphors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77342—Silicates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32245—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
The invention relates to a white-light emitting luminescent conversion LED using a chlorosilicate luminous substance which is doped with europium in addition to containing Ca and Ma and a garnet luminous rare-earth substance, especially Y and/or Tb, offering high quality colour reproduction and highly constant lighting properties at various temperatures.
Description
a LED-based white-emitting illusainatioa nait Technical field The invention relates to an LED-based white-emitting illumination unit, in which the LED emits primary W
radiation or blue light. Moreover, at least one yellow-emitting phosphor and one green-emitting phosphor are used for partial conversion of the primary radiation.
The yellow phosphor used is a Ce-activated garnet which contains in particular Y and/or Tb. The green phosphor used is an Eu-activated calcium magnesium chlorosilicate (CaeMg ( Si04 ) 4C12 ) .
Prior art J. Electrochem. Soc. 1992, p. 622 has already disclosed a chlorosilicate phosphor and its use for UV and blue-light excitation, which is doped with Eu (Luminescence Properties and Energy Transfer of Eu2+ Doped Ca$Mg ( Si04 ) 4C12 Phosphors ) . It lights up in the green spectral region. A specific application for this phosphor is not described.
Luminescence conversion LEDs which emit white light are currently produced by combining a blue Ga(In)N LED
which emits at approximately 460 nm and a yellow-emitting YAG:Ce3+ phosphor (US 5,998,925 and EP 862 794). However, these white light LEDs can only be used to a limited extent for general-purpose illumination, on account of their poor color rendering caused by the absence of color components (primarily the red component). An alternative is to mix three colors RGB (red, green, blue), which together result in white, cf. for example WO 98/39805.
' CA 02380444 2002-O1-25 Su~oary of the invention It is an obj ect of the present invention to provide an illumination unit based on an LED in accordance with the preamble of claim 1 which emits white light and in particular has a high color rendering.
These objects are achieved by the characterizing features of claim 1. Particularly advantageous configurations are given in the dependent claims.
Previous solutions for a white LED have been based in particular either on the RGB approach, i.e. on mixing three colors, namely red, green and blue, in which case the latter component may be provided by a phosphor or by the primary emission of the LED, or, in a second, simplified solution, on mixing blue and yellow (BY
approach), as discussed in the introduction.
According to the invention, a completely new concept which is based on a BYG mixture, i.e. the combination of a blue, yellow and green color, is used for the first time. The essential factor is that the yellow phosphors are so broad-banded that they also have a sufficient proportion of the emission in the red spectral region, in particular a proportion of at least 20~ of their total emission in the visible region lies in a spectral region > 620 nm.
A Ce-activated garnet of the rare earths (RE), preferably with RE selected from Y, Tb, Gd, Lu and/or La, has proven to be a particularly suitable yellow-emitting phosphor. A combination of Y and Tb is preferred. In this case, the long-wave shift caused by Tb has a particularly positive effect with a view to achieving a sufficient red proportion.
A CaMg chlorosilicate framework which, according to the invention, is doped with europium (Eu), is preferably a ' CA 02380444 2002-O1-25 - 2a -particularly suitable green-emitting phosphor (its peak emission wavelength preferably lies in the 500 to 525 nm region). If appropriate, it is also possible for small quantities of further dopants, in particular of manganese (Mn) to be added in small proportions for fine-tuning. A further alternative is a green phosphor of type SrAlz04 : Euz+ or Sr4A1140z5 : Euz+.
radiation or blue light. Moreover, at least one yellow-emitting phosphor and one green-emitting phosphor are used for partial conversion of the primary radiation.
The yellow phosphor used is a Ce-activated garnet which contains in particular Y and/or Tb. The green phosphor used is an Eu-activated calcium magnesium chlorosilicate (CaeMg ( Si04 ) 4C12 ) .
Prior art J. Electrochem. Soc. 1992, p. 622 has already disclosed a chlorosilicate phosphor and its use for UV and blue-light excitation, which is doped with Eu (Luminescence Properties and Energy Transfer of Eu2+ Doped Ca$Mg ( Si04 ) 4C12 Phosphors ) . It lights up in the green spectral region. A specific application for this phosphor is not described.
Luminescence conversion LEDs which emit white light are currently produced by combining a blue Ga(In)N LED
which emits at approximately 460 nm and a yellow-emitting YAG:Ce3+ phosphor (US 5,998,925 and EP 862 794). However, these white light LEDs can only be used to a limited extent for general-purpose illumination, on account of their poor color rendering caused by the absence of color components (primarily the red component). An alternative is to mix three colors RGB (red, green, blue), which together result in white, cf. for example WO 98/39805.
' CA 02380444 2002-O1-25 Su~oary of the invention It is an obj ect of the present invention to provide an illumination unit based on an LED in accordance with the preamble of claim 1 which emits white light and in particular has a high color rendering.
These objects are achieved by the characterizing features of claim 1. Particularly advantageous configurations are given in the dependent claims.
Previous solutions for a white LED have been based in particular either on the RGB approach, i.e. on mixing three colors, namely red, green and blue, in which case the latter component may be provided by a phosphor or by the primary emission of the LED, or, in a second, simplified solution, on mixing blue and yellow (BY
approach), as discussed in the introduction.
According to the invention, a completely new concept which is based on a BYG mixture, i.e. the combination of a blue, yellow and green color, is used for the first time. The essential factor is that the yellow phosphors are so broad-banded that they also have a sufficient proportion of the emission in the red spectral region, in particular a proportion of at least 20~ of their total emission in the visible region lies in a spectral region > 620 nm.
A Ce-activated garnet of the rare earths (RE), preferably with RE selected from Y, Tb, Gd, Lu and/or La, has proven to be a particularly suitable yellow-emitting phosphor. A combination of Y and Tb is preferred. In this case, the long-wave shift caused by Tb has a particularly positive effect with a view to achieving a sufficient red proportion.
A CaMg chlorosilicate framework which, according to the invention, is doped with europium (Eu), is preferably a ' CA 02380444 2002-O1-25 - 2a -particularly suitable green-emitting phosphor (its peak emission wavelength preferably lies in the 500 to 525 nm region). If appropriate, it is also possible for small quantities of further dopants, in particular of manganese (Mn) to be added in small proportions for fine-tuning. A further alternative is a green phosphor of type SrAlz04 : Euz+ or Sr4A1140z5 : Euz+.
In the color diagram, the color locus of the green phosphor, together with the color locus of the yellow phosphor and that of the blue LED (or of the blue phosphor), encloses a broad triangle, creating additional possibilities for adapting to specific requirements. The variation range of the color locus of different garnets, by contrast, is considerably less.
Therefore, it is also possible for the color temperature which can be achieved to be scattered over a wide range, typically from 4000 to 10 000 K.
The invention is particularly advantageous in connection with the development of a white-emitting illumination unit. This is an illumination unit which is based either on an LED array or on individual LEDs or is a direct luminescence conversion LED in which the phosphors are in direct or indirect contact with the chip, i.e. are applied directly to the chip or are embedded in the resin surrounding it.
White light can be generated by a combination of LEDs which emit W or blue light (referred to overall in the present description as "short-wave" light) with an emission wavelength (peak) of between 300 and 470 nm and the phosphor mixture according to the invention, which completely or partially absorbs the radiation from the LED and itself emits in spectral regions in which its additive mixture with the light of the LED
results in white light with good color rendering. It may be necessary to add an additional blue-emitting phosphor component (for example BAM). Particularly efficient excitation is achieved, in the case of a W
LED, at an emission wavelength (peak) of approximately 330 to 350 nm and, in the case of a blue LED, at an emission wavelength (peak) of approximately 450 to 470 nm.
The result is an improved color rendering of the known white LED based on a garnet phosphor, for - 3a -example by admixing 20 to 50~ by weight of the chlorosilicate phosphor. The yellow-emitting phosphor is a garnet of the rare earths (RE) Y, Gd, Lu, La and/or Tb, in accordance with the formula RE3 (A1, Ga) 5O12:Ce, in particular where RE = Y and/or Tb, in particular in accordance with the formula YAG:Ce or TbAG:Ce.
The phosphor Ca$Mg ( Si04 ) 4C12 : Eu2+ is known from the scientific literature, without this literature indicating any specific application for the phosphor.
According to the invention, this phosphor is emanately suitable for use in white LEDs, particularly advantageously based on a three-color mixture which is excited by a primary W light source (300 to 390 nm). However, it is also suitable for special applications in a white LED with blue primary light source (430 to 470 nm). The proportion x of the europium is advantageously between x = 0.005 and 1.6, and in particular between x = 0.01 and x = 1Ø
This provides the empirical formula Ca8_XEuXMg ( Si04 ) 4C12 .
The addition of Mn as further dopant in addition to Eu, in small quantities (up to approximately 20~ of the molar proportion of Eu), allows the emission to be shifted in a controlled manner out of the green spectral region more toward the long-wave region, i.e.
into the yellow spectral region. This has the advantage of enabling the emission to be better matched to the human eye and therefore also of improving the visual use effect. The proportion y of the Mn should be at most y = 0.1. It is particularly preferable for the proportion of the europium to be between x = 0.05 and 0.8, without manganese being added.
The europium concentration influences the color locus of the emission light when used in a light source, in particular an LED. The color locus of this phosphor can be additionally fine-tuned using the ratio of the two concentrations Eu:Mn, which simplifies or optimizes adaptation to any further (yellow or blue) phosphors in the LED.
The phosphors according to the invention can also be used, for example, in an appliance in which an LED
array (W or blue primary emission) illuminates phosphors on a transparent plate or in which individual LEDs illuminate phosphors which are arranged on a lens.
It is particularly advantageous for the phosphors according to the invention to be used to produce a - 4a -white LED of high color rendering. For this purpose, the phosphors are applied either separately or in a mixture, and if appropriate are combined with a binder which as far as possible is transparent (EP 862 794).
The phosphors completely or partially absorb the light from the LED which emits W/blue light and emit it again in other spectral regions (primarily yellow and green) in a sufficiently broadband (specifically with a significant proportion of red) that an overall emission with the desired color locus is formed. Hitherto, there has been scarcely any knowledge of phosphors which satisfy these requirements as well as the phosphors in their combination described here. They have a high quantum efficiency (around 70$) and, at the same time, a spectral emission which is found to be bright, on account of the sensitivity of the eye. The color locus can be set within a wide range.
A suitable light source is an LED (light-emitting diode), which generates white light, either by directly mixing the green- or yellow-emitting phosphor with the primary radiation in the blue spectral region (430 to 470 nm) or by converting radiation which is primarily emitted as W radiation into white by means of a plurality of phosphors (complete BYG mixing by means of three phosphors). In general, in the present context the terms blue, yellow and green will be understood as meaning emission maxima in the regions blue: 430 to 470 nm, green: 490 to 525 nm and yellow: 545 to 590 nm.
The primary light source used is the radiation from a W-emitting or blue-emitting chip. Particularly good results are achieved with a W-QED whose emission maximum lies at 330 to 370 nm. An optimum has been found to lie at 355 to 365 nm, taking particular account of the excitation spectrum of the garnets and chlorosilicates. The blue phosphor used here is, for example, BAM. In the case of a blue chip, particularly good results can be achieved with a peak wavelength of 430 to 470 nm. An optimum has been found to lie at 445 to 460 nm, taking particular account of the excitation spectrum of the garnets and chlorosilicates.
A variant with particularly good color rendering is the joint use of two phosphors, namely a phosphor with a high Tb content, preferably pure TbAG:Ce, together with chlorosilicate:Eu. A variant with particularly good temperature stability is the joint use of two phosphors, namely a phosphor with a high Y content, preferably pure YAG:Ce, together with chlorosilicate:
Eu.
- 5a -A particularly suitable LED which emits W or blue radiation (referred to as short-wave radiation for short below) as primary radiation is a Ga ( In) N LED, or alternatively any other short-wave emitting LED which emits in the 300 to 470 nm region. In particular, it is recommended for the main emission region to lie in the W region (320 to 360 nm) and in the blue region (430 to 470 nm), since this is when the efficiency is highest.
Therefore, it is also possible for the color temperature which can be achieved to be scattered over a wide range, typically from 4000 to 10 000 K.
The invention is particularly advantageous in connection with the development of a white-emitting illumination unit. This is an illumination unit which is based either on an LED array or on individual LEDs or is a direct luminescence conversion LED in which the phosphors are in direct or indirect contact with the chip, i.e. are applied directly to the chip or are embedded in the resin surrounding it.
White light can be generated by a combination of LEDs which emit W or blue light (referred to overall in the present description as "short-wave" light) with an emission wavelength (peak) of between 300 and 470 nm and the phosphor mixture according to the invention, which completely or partially absorbs the radiation from the LED and itself emits in spectral regions in which its additive mixture with the light of the LED
results in white light with good color rendering. It may be necessary to add an additional blue-emitting phosphor component (for example BAM). Particularly efficient excitation is achieved, in the case of a W
LED, at an emission wavelength (peak) of approximately 330 to 350 nm and, in the case of a blue LED, at an emission wavelength (peak) of approximately 450 to 470 nm.
The result is an improved color rendering of the known white LED based on a garnet phosphor, for - 3a -example by admixing 20 to 50~ by weight of the chlorosilicate phosphor. The yellow-emitting phosphor is a garnet of the rare earths (RE) Y, Gd, Lu, La and/or Tb, in accordance with the formula RE3 (A1, Ga) 5O12:Ce, in particular where RE = Y and/or Tb, in particular in accordance with the formula YAG:Ce or TbAG:Ce.
The phosphor Ca$Mg ( Si04 ) 4C12 : Eu2+ is known from the scientific literature, without this literature indicating any specific application for the phosphor.
According to the invention, this phosphor is emanately suitable for use in white LEDs, particularly advantageously based on a three-color mixture which is excited by a primary W light source (300 to 390 nm). However, it is also suitable for special applications in a white LED with blue primary light source (430 to 470 nm). The proportion x of the europium is advantageously between x = 0.005 and 1.6, and in particular between x = 0.01 and x = 1Ø
This provides the empirical formula Ca8_XEuXMg ( Si04 ) 4C12 .
The addition of Mn as further dopant in addition to Eu, in small quantities (up to approximately 20~ of the molar proportion of Eu), allows the emission to be shifted in a controlled manner out of the green spectral region more toward the long-wave region, i.e.
into the yellow spectral region. This has the advantage of enabling the emission to be better matched to the human eye and therefore also of improving the visual use effect. The proportion y of the Mn should be at most y = 0.1. It is particularly preferable for the proportion of the europium to be between x = 0.05 and 0.8, without manganese being added.
The europium concentration influences the color locus of the emission light when used in a light source, in particular an LED. The color locus of this phosphor can be additionally fine-tuned using the ratio of the two concentrations Eu:Mn, which simplifies or optimizes adaptation to any further (yellow or blue) phosphors in the LED.
The phosphors according to the invention can also be used, for example, in an appliance in which an LED
array (W or blue primary emission) illuminates phosphors on a transparent plate or in which individual LEDs illuminate phosphors which are arranged on a lens.
It is particularly advantageous for the phosphors according to the invention to be used to produce a - 4a -white LED of high color rendering. For this purpose, the phosphors are applied either separately or in a mixture, and if appropriate are combined with a binder which as far as possible is transparent (EP 862 794).
The phosphors completely or partially absorb the light from the LED which emits W/blue light and emit it again in other spectral regions (primarily yellow and green) in a sufficiently broadband (specifically with a significant proportion of red) that an overall emission with the desired color locus is formed. Hitherto, there has been scarcely any knowledge of phosphors which satisfy these requirements as well as the phosphors in their combination described here. They have a high quantum efficiency (around 70$) and, at the same time, a spectral emission which is found to be bright, on account of the sensitivity of the eye. The color locus can be set within a wide range.
A suitable light source is an LED (light-emitting diode), which generates white light, either by directly mixing the green- or yellow-emitting phosphor with the primary radiation in the blue spectral region (430 to 470 nm) or by converting radiation which is primarily emitted as W radiation into white by means of a plurality of phosphors (complete BYG mixing by means of three phosphors). In general, in the present context the terms blue, yellow and green will be understood as meaning emission maxima in the regions blue: 430 to 470 nm, green: 490 to 525 nm and yellow: 545 to 590 nm.
The primary light source used is the radiation from a W-emitting or blue-emitting chip. Particularly good results are achieved with a W-QED whose emission maximum lies at 330 to 370 nm. An optimum has been found to lie at 355 to 365 nm, taking particular account of the excitation spectrum of the garnets and chlorosilicates. The blue phosphor used here is, for example, BAM. In the case of a blue chip, particularly good results can be achieved with a peak wavelength of 430 to 470 nm. An optimum has been found to lie at 445 to 460 nm, taking particular account of the excitation spectrum of the garnets and chlorosilicates.
A variant with particularly good color rendering is the joint use of two phosphors, namely a phosphor with a high Tb content, preferably pure TbAG:Ce, together with chlorosilicate:Eu. A variant with particularly good temperature stability is the joint use of two phosphors, namely a phosphor with a high Y content, preferably pure YAG:Ce, together with chlorosilicate:
Eu.
- 5a -A particularly suitable LED which emits W or blue radiation (referred to as short-wave radiation for short below) as primary radiation is a Ga ( In) N LED, or alternatively any other short-wave emitting LED which emits in the 300 to 470 nm region. In particular, it is recommended for the main emission region to lie in the W region (320 to 360 nm) and in the blue region (430 to 470 nm), since this is when the efficiency is highest.
~'iQures The invention is to be explained in more detail below with reference to a number of exemplary embodiments. In the drawing:
Figure 1 shows the excitation and emission spectrum of an europium-doped chlorosilicate;
Figure 2 shows the reflection and emission spectrum of a further europium-doped chlorosilicate;
Figure 3 shows a semiconductor component which is used as light source (LED) for white light;
Figure 4 shows the emission spectrum of the LED from Figure 3, using the phosphors TbAG and CS:Eu in accordance with the present invention;
Figure 5 shows the emission spectrum of a further LED
using the phosphors TbAG and CS:Eu in accordance with the present invention;
Figure 5 shows the temperature behavior of an LED
using the phosphors YAG and CS:Eu in accordance with the present invention;
Figure 7 shows the emission spectrum of an LED using the phosphors YAG and CS:Eu in accordance with the present invention;
Figure 8 shows an illumination unit using phosphors in accordance with the present invention.
Description of the figures The following text provides a more detailed description, by way of example, of the synthesis of an Eu-doped and Mn-doped chlorosilicate CaeMg(Si04)4C12:
(Eu2',Mn2+) . Then, the suitability of this phosphor is documented on the basis of a number of exemplary measurements.
The phosphor powder is produced by means of a high-temperature solid-state reaction. For this purpose, by way of example, the highly pure starting materials - 6a -CaC03, MgO, Si02 and CaCl2 are mixed together in a molar ratio of 7:1:4:1.5. A small quantity of Eu203 or MnC03 is added for doping purposes, replacing the corresponding molar quantity of CaC03. This corresponds to the empirical formula Ca8_X-YEuXMnyMg (Si04) 4Clz plus 0 . 5 CaCl2.
After the individual components have been well mixed, the powder is heated at 1000 - 1200°C for 1 - 4 h in a reducing atmosphere (Hz/N2) , so that it reacts with the compound described above. To remove excess CaClz and other water-soluble foreign phases, the powder can be washed again using fully deionized water. The result is a phosphor powder with high quantum efficiencies (typically approximately 70~) when excited in the short-wave wavelength region around 400 nm.
Figure 1 shows a typical excitation and emission spectrum of a europium-doped powder. The amount of Eu203 added is 0.03 mol, i.e. x = 0.06. The efficiency of excitation over a very wide wavelength region from 300 to 470 nm, primarily 360 to 400 nm, is quite clear from this figure. The reduction in excitability at greater wavelengths is caused by the Eu'+ absorption band.
However, at 460 nm, quantum efficiencies which are comparable to those at 400 nm or even shorter wavelengths (down to approximately 340 nm) are still measured.
The emission spectrum has an Euz+ emission band with a maximum at about 507 nm. This emission appears green to the eye. If desired, the emission behavior of the phosphor can be better matched to the sensitivity of the eye by co-doping with a small quantity of manganese.
Figure 2 shows a further exemplary embodiment of an Eu-doped chlorosilicate CaaMg ( Si04 ) 4C12 : Eu2+ (CS : Eu for short). The amount of Eu203 added is 0.2 mol, i.e.
x = 0.4. The peak wavelength is at 509 nm, the mean wavelength at 522 nm. The color coordinates are x = 0.185 and y = 0.615. The emission when irradiated at 400 nm is shown in arbitrary units in Figure 2a.
Furthermore, the reflection (in percent) is also indicated in Figure 2b.
- 7a -For use in a white LED together with a GaInN chip, by way of example a structure similar to that described in US 5,998,925 is used. The structure of a light source of this type for white light is specifically shown in Figure 3. The light source is a semiconductor component (chip 1) of type InGaN with a peak emission wavelength of 450 nm, having a first and a second electrical connection 2, 3 embedded in an opaque base housing 8 in the region of a recess 9. One of the connections 3 is connected to the chip 1 via a bonding wire 14. The recess. has a wall 17 which serves as reflector for the blue primary radiation from the chip 1. The recess 9 is filled with a potting compound 5, the principal constituents of which are an epoxy casting resin (80 to 90~ by weight) and phosphor pigments 6 ( less than 15~ by weight ) . Any other small fractions are methyl ether and aerosil, inter alia.
In this arrangement, the chlorosilicate phosphor (CS:Eu) of the second exemplary embodiment together with TbAG:Ce are used for the phosphor pigments. The mixing ratio (CS:Eu) to TbAG is 4:6 (parts by weight).
This exemplary embodiment is distinguished by a particularly high color rendering of Ra = 85. The emission spectrum of this exemplary embodiment is shown in Figure 4.
A direct comparison between a conventional solution (BG) and a solution according to the invention (BYG) reveals the following result: the BG solution selected was a blue-emitting InGaN chip (peak at 450 nm) together with conventional YAG:Ce. The BYG solution according to the invention selected was the same LED
together with TbAG:Ce and CS:Eu. This in each case leads to a color temperature of 6000 K at a color locus with x = 0.322 and y = 0.366. While the simple BG
solution only achieves a color rendering of Ra = 72, the BYG solution achieves a color rendering of Ra = 80.
The red rendering is also considerably improved, namely from R9 = -22 to R9 = 10. The emission spectrum of the BYG solution is shown in Figure 5.
A further preferred exemplary embodiment of a white LED
uses, in addition to the InGaN chip (blue emission at 450 nm), the combination of the abovementioned chlorosilicate phosphor (CS:Eu) with YAG:Ce. This exemplary embodiment is distinguished by an extremely similar temperature-extinguishing behavior of both phosphors, as can be seen from Figure 6. The temperature-extinguishing behavior of both phosphors is practically identical over the permissible range of use (up to approximately 100°C) and is only slightly temperature-dependent. Other garnets, such as for - 8a -example the mixed garnet (Yo.33Gdo.63Cep.oa)Als4~a. which was also investigated for comparative purposes, have a considerably worse constancy of temperature (in Figure 6, this mixed garnet is referred to as (Y,Gd)AG:Ce). Therefore, particular constancy of the color locus and of further lighting data is ensured under a very wide range of temperature conditions in this exemplary embodiment, which contains a high level of Y (or alternatively Tb) as RE (at least 60 mold of the RE lattice position). The emission spectrum of this exemplary embodiment is shown in Figure 7. It corresponds to a color temperature of 8000 K and a color locus having the coordinates x = 0.294 and y - 0.309. The color rendering is Ra = 77. The mixing ratio of the two phosphors is 4.6:1.
Figure 8 shows a surface-lighting fitting 20 as illumination unit. It comprises a common support 21, to which a cuboidal outer housing 22 is adhesively bonded.
Its upper side is provided with a common cover 23. The cuboidal housing has cutouts in which individual semiconductor components 24 are accommodated. They are UV-emitting LEDs with a peak emission of 360 nm. The conversion into white light takes place by means of conversion layers 25 which are arranged on all surfaces which are accessible to the W radiation. These include the inner surfaces of the side walls of the housing, of the cover and of the base part. The conversion layers consist of three phosphors which emit in the yellow, green and blue spectral regions using the phosphors according to the invention.
Figure 1 shows the excitation and emission spectrum of an europium-doped chlorosilicate;
Figure 2 shows the reflection and emission spectrum of a further europium-doped chlorosilicate;
Figure 3 shows a semiconductor component which is used as light source (LED) for white light;
Figure 4 shows the emission spectrum of the LED from Figure 3, using the phosphors TbAG and CS:Eu in accordance with the present invention;
Figure 5 shows the emission spectrum of a further LED
using the phosphors TbAG and CS:Eu in accordance with the present invention;
Figure 5 shows the temperature behavior of an LED
using the phosphors YAG and CS:Eu in accordance with the present invention;
Figure 7 shows the emission spectrum of an LED using the phosphors YAG and CS:Eu in accordance with the present invention;
Figure 8 shows an illumination unit using phosphors in accordance with the present invention.
Description of the figures The following text provides a more detailed description, by way of example, of the synthesis of an Eu-doped and Mn-doped chlorosilicate CaeMg(Si04)4C12:
(Eu2',Mn2+) . Then, the suitability of this phosphor is documented on the basis of a number of exemplary measurements.
The phosphor powder is produced by means of a high-temperature solid-state reaction. For this purpose, by way of example, the highly pure starting materials - 6a -CaC03, MgO, Si02 and CaCl2 are mixed together in a molar ratio of 7:1:4:1.5. A small quantity of Eu203 or MnC03 is added for doping purposes, replacing the corresponding molar quantity of CaC03. This corresponds to the empirical formula Ca8_X-YEuXMnyMg (Si04) 4Clz plus 0 . 5 CaCl2.
After the individual components have been well mixed, the powder is heated at 1000 - 1200°C for 1 - 4 h in a reducing atmosphere (Hz/N2) , so that it reacts with the compound described above. To remove excess CaClz and other water-soluble foreign phases, the powder can be washed again using fully deionized water. The result is a phosphor powder with high quantum efficiencies (typically approximately 70~) when excited in the short-wave wavelength region around 400 nm.
Figure 1 shows a typical excitation and emission spectrum of a europium-doped powder. The amount of Eu203 added is 0.03 mol, i.e. x = 0.06. The efficiency of excitation over a very wide wavelength region from 300 to 470 nm, primarily 360 to 400 nm, is quite clear from this figure. The reduction in excitability at greater wavelengths is caused by the Eu'+ absorption band.
However, at 460 nm, quantum efficiencies which are comparable to those at 400 nm or even shorter wavelengths (down to approximately 340 nm) are still measured.
The emission spectrum has an Euz+ emission band with a maximum at about 507 nm. This emission appears green to the eye. If desired, the emission behavior of the phosphor can be better matched to the sensitivity of the eye by co-doping with a small quantity of manganese.
Figure 2 shows a further exemplary embodiment of an Eu-doped chlorosilicate CaaMg ( Si04 ) 4C12 : Eu2+ (CS : Eu for short). The amount of Eu203 added is 0.2 mol, i.e.
x = 0.4. The peak wavelength is at 509 nm, the mean wavelength at 522 nm. The color coordinates are x = 0.185 and y = 0.615. The emission when irradiated at 400 nm is shown in arbitrary units in Figure 2a.
Furthermore, the reflection (in percent) is also indicated in Figure 2b.
- 7a -For use in a white LED together with a GaInN chip, by way of example a structure similar to that described in US 5,998,925 is used. The structure of a light source of this type for white light is specifically shown in Figure 3. The light source is a semiconductor component (chip 1) of type InGaN with a peak emission wavelength of 450 nm, having a first and a second electrical connection 2, 3 embedded in an opaque base housing 8 in the region of a recess 9. One of the connections 3 is connected to the chip 1 via a bonding wire 14. The recess. has a wall 17 which serves as reflector for the blue primary radiation from the chip 1. The recess 9 is filled with a potting compound 5, the principal constituents of which are an epoxy casting resin (80 to 90~ by weight) and phosphor pigments 6 ( less than 15~ by weight ) . Any other small fractions are methyl ether and aerosil, inter alia.
In this arrangement, the chlorosilicate phosphor (CS:Eu) of the second exemplary embodiment together with TbAG:Ce are used for the phosphor pigments. The mixing ratio (CS:Eu) to TbAG is 4:6 (parts by weight).
This exemplary embodiment is distinguished by a particularly high color rendering of Ra = 85. The emission spectrum of this exemplary embodiment is shown in Figure 4.
A direct comparison between a conventional solution (BG) and a solution according to the invention (BYG) reveals the following result: the BG solution selected was a blue-emitting InGaN chip (peak at 450 nm) together with conventional YAG:Ce. The BYG solution according to the invention selected was the same LED
together with TbAG:Ce and CS:Eu. This in each case leads to a color temperature of 6000 K at a color locus with x = 0.322 and y = 0.366. While the simple BG
solution only achieves a color rendering of Ra = 72, the BYG solution achieves a color rendering of Ra = 80.
The red rendering is also considerably improved, namely from R9 = -22 to R9 = 10. The emission spectrum of the BYG solution is shown in Figure 5.
A further preferred exemplary embodiment of a white LED
uses, in addition to the InGaN chip (blue emission at 450 nm), the combination of the abovementioned chlorosilicate phosphor (CS:Eu) with YAG:Ce. This exemplary embodiment is distinguished by an extremely similar temperature-extinguishing behavior of both phosphors, as can be seen from Figure 6. The temperature-extinguishing behavior of both phosphors is practically identical over the permissible range of use (up to approximately 100°C) and is only slightly temperature-dependent. Other garnets, such as for - 8a -example the mixed garnet (Yo.33Gdo.63Cep.oa)Als4~a. which was also investigated for comparative purposes, have a considerably worse constancy of temperature (in Figure 6, this mixed garnet is referred to as (Y,Gd)AG:Ce). Therefore, particular constancy of the color locus and of further lighting data is ensured under a very wide range of temperature conditions in this exemplary embodiment, which contains a high level of Y (or alternatively Tb) as RE (at least 60 mold of the RE lattice position). The emission spectrum of this exemplary embodiment is shown in Figure 7. It corresponds to a color temperature of 8000 K and a color locus having the coordinates x = 0.294 and y - 0.309. The color rendering is Ra = 77. The mixing ratio of the two phosphors is 4.6:1.
Figure 8 shows a surface-lighting fitting 20 as illumination unit. It comprises a common support 21, to which a cuboidal outer housing 22 is adhesively bonded.
Its upper side is provided with a common cover 23. The cuboidal housing has cutouts in which individual semiconductor components 24 are accommodated. They are UV-emitting LEDs with a peak emission of 360 nm. The conversion into white light takes place by means of conversion layers 25 which are arranged on all surfaces which are accessible to the W radiation. These include the inner surfaces of the side walls of the housing, of the cover and of the base part. The conversion layers consist of three phosphors which emit in the yellow, green and blue spectral regions using the phosphors according to the invention.
Claims (10)
1. A white-emitting illumination unit, having at least one LED as light source, the LED emitting primary radiation in the 300 to 470 nm region, this radiation being partially or completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation of the LED, characterized in that the conversion takes place at least with the aid of a green-emitting phosphor which originates from the class of the Eu-activated calcium magnesium chlorosilicates and of at least one yellow-emitting phosphor which originates from the class of the Ce-activated rare earth garnets.
2. The white-emitting illumination unit as claimed in claim 1, characterized in that the green-emitting phosphor satisfies the empirical formula Ca8-x-y-Eu x Mn y Mg(SiO4)4Cl2, where x is between x = 0.005 and x = 1.6 and y is between y = 0 and y = 0.1 (in each case including cut-off values).
3. The white-emitting illumination unit as claimed in claim 1, characterized in that the yellow-emitting phosphor is a garnet of the rare earths (RE) Y, Gd, Lu, La and/or Tb, in accordance with the formula RE3(Al,Ga)5O12:Ce, in particular where RE = Y and/or Tb, in particular in accordance with the formula YAG:Ce or TbAG:Ce.
4. The white-emitting illumination unit as claimed in claim 1, characterized in that the primary emitted radiation lies in the 330 to 370 nm wavelength range, the primary emitted radiation being exposed to three phosphors with emission maxima in the blue region (430 to 470 nm), the green region (490 to 525 nm) and the yellow region (545 to 590 nm).
-10a-
-10a-
5. The white-emitting illumination unit as claimed in claim 1, characterized in that the primary emitted radiation lies in the blue wavelength region from 430 to 470 nm, the primary emitted blue radiation being exposed to two phosphors with emission maxima in the yellow region (545 nm to 590 nm) and in the green region (490 to 525 nm) as set forth in one of the preceding claims.
6. The white-emitting luminescence conversion LED as set forth in claim 1, characterized in that a short-wave light-emitting diode, in particular based on Ga(In)N, is used as primary radiation source.
7. The white-emitting illumination unit as claimed in claim 1, characterized in that the proportion of europium is between x = 0.1 and x = 1.0, without Mn additionally being used.
8. The white-emitting illumination unit as claimed in claim 1, characterized in that the illumination unit is a luminescence conversion LED in which the phosphors are in direct or indirect contact with the chip.
9. The white-emitting illumination unit as claimed in claim 1, characterized in that the illumination unit is an array of LEDs.
10. The white-emitting illumination unit as claimed in claim 9, characterized in that at least one of the phosphors is arranged on an optical device which has been arranged in front of the LED array.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10026435A DE10026435A1 (en) | 2000-05-29 | 2000-05-29 | Calcium-magnesium-chlorosilicate phosphor and its application in luminescence conversion LEDs |
DE10026435.2 | 2000-05-29 | ||
DE20108013.3 | 2001-05-11 | ||
DE20108013U DE20108013U1 (en) | 2001-05-11 | 2001-05-11 | White-emitting LED-based lighting unit |
PCT/DE2001/001955 WO2001093342A1 (en) | 2000-05-29 | 2001-05-23 | Led-based white-light emitting lighting unit |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2380444A1 true CA2380444A1 (en) | 2001-12-06 |
Family
ID=26005867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA002380444A Abandoned CA2380444A1 (en) | 2000-05-29 | 2001-05-23 | Led-based white-emitting illumination unit |
Country Status (9)
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US (1) | US6504179B1 (en) |
EP (1) | EP1206802B1 (en) |
JP (1) | JP4695819B2 (en) |
KR (1) | KR100784573B1 (en) |
CN (1) | CN1203557C (en) |
CA (1) | CA2380444A1 (en) |
DE (1) | DE50113755D1 (en) |
TW (1) | TW555832B (en) |
WO (1) | WO2001093342A1 (en) |
Families Citing this family (179)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100450647B1 (en) * | 1999-07-23 | 2004-10-01 | 파텐트-트로이한트-게젤샤프트 퓌어 엘렉트리쉐 글뤼람펜 엠베하 | Luminescent array, wavelength-converting sealing material and light source |
JP2003505582A (en) * | 1999-07-23 | 2003-02-12 | パテント−トロイハント−ゲゼルシヤフト フユール エレクトリツシエ グリユーラムペン ミツト ベシユレンクテル ハフツング | Light emitting material for light source and light source having light emitting material |
US20050073839A1 (en) * | 2003-09-18 | 2005-04-07 | The Litebook Company Ltd | Light therapy device |
CA2317319A1 (en) | 2000-03-14 | 2001-09-14 | The Litebook Company Ltd | Light therapy device |
DE10026435A1 (en) * | 2000-05-29 | 2002-04-18 | Osram Opto Semiconductors Gmbh | Calcium-magnesium-chlorosilicate phosphor and its application in luminescence conversion LEDs |
US20030015708A1 (en) * | 2001-07-23 | 2003-01-23 | Primit Parikh | Gallium nitride based diodes with low forward voltage and low reverse current operation |
DE20115914U1 (en) * | 2001-09-27 | 2003-02-13 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Lighting unit with at least one LED as a light source |
ATE369854T1 (en) * | 2001-10-19 | 2007-09-15 | Ortho Mcneil Pharm Inc | 2-PHENYL BENZIMIDAZOLE AND IMIDAZO-[4,5]-PYRIDINES AS CDS1/CHK2 INHIBITORS AND ADJUVANTS IN CHEMOTHERAPY OR RADIATION THERAPY FOR THE TREATMENT OF CANCER |
JP2003147351A (en) * | 2001-11-09 | 2003-05-21 | Taiwan Lite On Electronics Inc | Manufacturing method of white light source |
AU2003211509A1 (en) * | 2002-02-15 | 2003-09-04 | Mitsubishi Chemical Corporation | Light emitting device and illuminating device using it |
JP4191937B2 (en) * | 2002-02-15 | 2008-12-03 | 株式会社日立製作所 | White light source and image display apparatus using the same |
KR100457864B1 (en) * | 2002-02-23 | 2004-11-18 | 삼성전기주식회사 | Phosphor for white LED lamp |
SG173925A1 (en) * | 2002-03-22 | 2011-09-29 | Nichia Corp | Nitride phosphor and production process thereof, and light emitting device |
JP2003306674A (en) * | 2002-04-15 | 2003-10-31 | Sumitomo Chem Co Ltd | Fluorescent material for white led, and white led using the same |
KR100554453B1 (en) * | 2002-08-21 | 2006-03-03 | 서울반도체 주식회사 | White light emitting device |
JP3498290B1 (en) * | 2002-12-19 | 2004-02-16 | 俊二 岸村 | White LED lighting device |
US20040142098A1 (en) * | 2003-01-21 | 2004-07-22 | Eastman Kodak Company | Using compacted organic materials in making white light emitting oleds |
US6885033B2 (en) * | 2003-03-10 | 2005-04-26 | Cree, Inc. | Light emitting devices for light conversion and methods and semiconductor chips for fabricating the same |
KR101100467B1 (en) | 2003-03-13 | 2011-12-29 | 오스람 옵토 세미컨덕터스 게엠베하 | Luminescence conversion of led with phosphorescence effect and use thereof |
WO2004087831A1 (en) * | 2003-03-28 | 2004-10-14 | Osram Opto Semiconductors Gmbh | Method for producing a coating on the surface of a particle or on a material and corresponding product |
US20040252488A1 (en) * | 2003-04-01 | 2004-12-16 | Innovalight | Light-emitting ceiling tile |
US7279832B2 (en) * | 2003-04-01 | 2007-10-09 | Innovalight, Inc. | Phosphor materials and illumination devices made therefrom |
JP2004317891A (en) * | 2003-04-17 | 2004-11-11 | Nec Saitama Ltd | Mobile electronic equipment with camera |
KR20040092512A (en) * | 2003-04-24 | 2004-11-04 | (주)그래픽테크노재팬 | A semiconductor light emitting device with reflectors having a cooling function |
DE10319091A1 (en) * | 2003-04-28 | 2004-09-09 | Siemens Ag | Luminous material for conversion of primary into secondary radiation and doped with calcium orthosilicate and europium useful for light emitting diodes |
US7884804B2 (en) * | 2003-04-30 | 2011-02-08 | Microsoft Corporation | Keyboard with input-sensitive display device |
US7005679B2 (en) * | 2003-05-01 | 2006-02-28 | Cree, Inc. | Multiple component solid state white light |
US6869812B1 (en) * | 2003-05-13 | 2005-03-22 | Heng Liu | High power AllnGaN based multi-chip light emitting diode |
US7521667B2 (en) * | 2003-06-23 | 2009-04-21 | Advanced Optical Technologies, Llc | Intelligent solid state lighting |
US7145125B2 (en) * | 2003-06-23 | 2006-12-05 | Advanced Optical Technologies, Llc | Integrating chamber cone light using LED sources |
US7088038B2 (en) | 2003-07-02 | 2006-08-08 | Gelcore Llc | Green phosphor for general illumination applications |
US7026755B2 (en) * | 2003-08-07 | 2006-04-11 | General Electric Company | Deep red phosphor for general illumination applications |
CN100383988C (en) * | 2003-08-20 | 2008-04-23 | 刘行仁 | White light LED and light converting luminophore |
JP2005093913A (en) * | 2003-09-19 | 2005-04-07 | Nichia Chem Ind Ltd | Light-emitting device |
JP2005093912A (en) * | 2003-09-19 | 2005-04-07 | Nichia Chem Ind Ltd | Light-emitting device |
CN100466308C (en) * | 2003-09-29 | 2009-03-04 | 松下电器产业株式会社 | Linear light source and production method therefor and surface emission device |
JP4834827B2 (en) * | 2003-10-03 | 2011-12-14 | 独立行政法人物質・材料研究機構 | Oxynitride phosphor |
US7252787B2 (en) * | 2003-10-29 | 2007-08-07 | General Electric Company | Garnet phosphor materials having enhanced spectral characteristics |
US7442326B2 (en) | 2003-10-29 | 2008-10-28 | Lumination Llc | Red garnet phosphors for use in LEDs |
US7094362B2 (en) | 2003-10-29 | 2006-08-22 | General Electric Company | Garnet phosphor materials having enhanced spectral characteristics |
DE10360546A1 (en) * | 2003-12-22 | 2005-07-14 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Phosphor and light source with such phosphor |
TW200525779A (en) * | 2004-01-27 | 2005-08-01 | Super Nova Optoelectronics Corp | White-like light emitting device and its manufacturing method |
KR100605211B1 (en) | 2004-04-07 | 2006-07-31 | 엘지이노텍 주식회사 | Phosphor and white led using the same |
KR100605212B1 (en) * | 2004-04-07 | 2006-07-31 | 엘지이노텍 주식회사 | Phosphor and white led using the same |
US20050236958A1 (en) * | 2004-04-23 | 2005-10-27 | Harvatek Corporation | White light-emitting device |
KR100865624B1 (en) * | 2004-04-27 | 2008-10-27 | 파나소닉 주식회사 | Phosphor composition and method for producing the same, and light-emitting device using the same |
TWI228841B (en) * | 2004-04-29 | 2005-03-01 | Lite On Technology Corp | Luminescence method and apparatus for color temperature adjustable white light |
US7534633B2 (en) * | 2004-07-02 | 2009-05-19 | Cree, Inc. | LED with substrate modifications for enhanced light extraction and method of making same |
WO2006005005A2 (en) * | 2004-07-06 | 2006-01-12 | Sarnoff Corporation | Efficient, green-emitting phosphors, and combinations with red-emitting phosphors |
US8017035B2 (en) * | 2004-08-04 | 2011-09-13 | Intematix Corporation | Silicate-based yellow-green phosphors |
US7267787B2 (en) * | 2004-08-04 | 2007-09-11 | Intematix Corporation | Phosphor systems for a white light emitting diode (LED) |
DE102004038199A1 (en) * | 2004-08-05 | 2006-03-16 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | LED with low color temperature |
US7750352B2 (en) * | 2004-08-10 | 2010-07-06 | Pinion Technologies, Inc. | Light strips for lighting and backlighting applications |
KR100485673B1 (en) | 2004-10-11 | 2005-04-27 | 씨엠에스테크놀로지(주) | White photoluminescence device |
KR100666265B1 (en) * | 2004-10-18 | 2007-01-09 | 엘지이노텍 주식회사 | Phosphor and LED using the same |
US20060097385A1 (en) * | 2004-10-25 | 2006-05-11 | Negley Gerald H | Solid metal block semiconductor light emitting device mounting substrates and packages including cavities and heat sinks, and methods of packaging same |
US7821023B2 (en) * | 2005-01-10 | 2010-10-26 | Cree, Inc. | Solid state lighting component |
US7564180B2 (en) * | 2005-01-10 | 2009-07-21 | Cree, Inc. | Light emission device and method utilizing multiple emitters and multiple phosphors |
US8125137B2 (en) | 2005-01-10 | 2012-02-28 | Cree, Inc. | Multi-chip light emitting device lamps for providing high-CRI warm white light and light fixtures including the same |
US20070114562A1 (en) * | 2005-11-22 | 2007-05-24 | Gelcore, Llc | Red and yellow phosphor-converted LEDs for signal applications |
US7648649B2 (en) * | 2005-02-02 | 2010-01-19 | Lumination Llc | Red line emitting phosphors for use in led applications |
US7497973B2 (en) * | 2005-02-02 | 2009-03-03 | Lumination Llc | Red line emitting phosphor materials for use in LED applications |
US7358542B2 (en) * | 2005-02-02 | 2008-04-15 | Lumination Llc | Red emitting phosphor materials for use in LED and LCD applications |
US7274045B2 (en) | 2005-03-17 | 2007-09-25 | Lumination Llc | Borate phosphor materials for use in lighting applications |
TWI249867B (en) * | 2005-03-24 | 2006-02-21 | Lighthouse Technology Co Ltd | Light-emitting diode package, cold cathode fluorescence lamp and photoluminescence material thereof |
US7276183B2 (en) * | 2005-03-25 | 2007-10-02 | Sarnoff Corporation | Metal silicate-silica-based polymorphous phosphors and lighting devices |
US7329371B2 (en) | 2005-04-19 | 2008-02-12 | Lumination Llc | Red phosphor for LED based lighting |
US20060279196A1 (en) * | 2005-06-02 | 2006-12-14 | Wei-Jen Hsu | White LED |
KR100533922B1 (en) * | 2005-08-05 | 2005-12-06 | 알티전자 주식회사 | Yellow phosphor and white light emitting device using there |
KR100704267B1 (en) * | 2005-10-17 | 2007-04-06 | 타이완 오아시스 테크놀러지 컴퍼니 리미티드 | White color multiwave diode and manufacturing method thereof |
US20070125984A1 (en) * | 2005-12-01 | 2007-06-07 | Sarnoff Corporation | Phosphors protected against moisture and LED lighting devices |
US8906262B2 (en) * | 2005-12-02 | 2014-12-09 | Lightscape Materials, Inc. | Metal silicate halide phosphors and LED lighting devices using the same |
CN101449097B (en) | 2005-12-21 | 2012-03-07 | 科锐公司 | Lighting device and lighting method |
CN101460779A (en) * | 2005-12-21 | 2009-06-17 | 科锐Led照明技术公司 | Lighting device |
US20070145879A1 (en) * | 2005-12-22 | 2007-06-28 | Abramov Vladimir S | Light emitting halogen-silicate photophosphor compositions and systems |
BRPI0620397A2 (en) * | 2005-12-22 | 2011-11-16 | Cree Led Lighting Solutions | lighting device |
US7772604B2 (en) | 2006-01-05 | 2010-08-10 | Illumitex | Separate optical device for directing light from an LED |
JP2007231250A (en) | 2006-02-02 | 2007-09-13 | Nichia Chem Ind Ltd | Phosphor and light-emitting device using the same |
JP2007227573A (en) * | 2006-02-22 | 2007-09-06 | Harison Toshiba Lighting Corp | Light emitting device |
US20090105065A1 (en) * | 2006-03-23 | 2009-04-23 | Koninklijke Philips Electronics N.V. | Light emitting device with a ceramic garnet material |
US9084328B2 (en) | 2006-12-01 | 2015-07-14 | Cree, Inc. | Lighting device and lighting method |
US8513875B2 (en) | 2006-04-18 | 2013-08-20 | Cree, Inc. | Lighting device and lighting method |
US7821194B2 (en) | 2006-04-18 | 2010-10-26 | Cree, Inc. | Solid state lighting devices including light mixtures |
BRPI0711255A2 (en) * | 2006-04-18 | 2011-08-30 | Cree Led Lighting Solutions | lighting device and lighting method |
US7997745B2 (en) | 2006-04-20 | 2011-08-16 | Cree, Inc. | Lighting device and lighting method |
US7722220B2 (en) | 2006-05-05 | 2010-05-25 | Cree Led Lighting Solutions, Inc. | Lighting device |
JP2009538532A (en) * | 2006-05-23 | 2009-11-05 | クリー エル イー ディー ライティング ソリューションズ インコーポレイテッド | Lighting device |
US8596819B2 (en) * | 2006-05-31 | 2013-12-03 | Cree, Inc. | Lighting device and method of lighting |
US9659493B2 (en) | 2006-06-06 | 2017-05-23 | R.D. Jones, Stop Experts, Inc. | Traffic beacon |
CN100448004C (en) * | 2006-06-06 | 2008-12-31 | 任慰 | Day-light diode light-source and making method for fluorescent powder |
DE102006029203B9 (en) * | 2006-06-26 | 2023-06-22 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Light Emitting Device |
KR101303179B1 (en) * | 2006-07-21 | 2013-09-09 | 삼성전자주식회사 | A phosphor for white LED, and white light emitting device including the same |
DE102007020782A1 (en) * | 2006-09-27 | 2008-04-03 | Osram Opto Semiconductors Gmbh | Radiation emitting device comprises a radiation-emitting functional layer emitting primary radiation in blue region, radiation conversion material arranged in beam path of the functional layer, and radiation conversion luminescent material |
US20090275266A1 (en) * | 2006-10-02 | 2009-11-05 | Illumitex, Inc. | Optical device polishing |
JP2010506402A (en) | 2006-10-02 | 2010-02-25 | イルミテックス, インコーポレイテッド | LED system and method |
EP2084242A4 (en) * | 2006-10-03 | 2009-12-16 | Sarnoff Corp | Metal silicate halide phosphors and led lighting devices using the same |
US8029155B2 (en) | 2006-11-07 | 2011-10-04 | Cree, Inc. | Lighting device and lighting method |
US7769066B2 (en) * | 2006-11-15 | 2010-08-03 | Cree, Inc. | Laser diode and method for fabricating same |
US9441793B2 (en) | 2006-12-01 | 2016-09-13 | Cree, Inc. | High efficiency lighting device including one or more solid state light emitters, and method of lighting |
US7918581B2 (en) | 2006-12-07 | 2011-04-05 | Cree, Inc. | Lighting device and lighting method |
US7834367B2 (en) | 2007-01-19 | 2010-11-16 | Cree, Inc. | Low voltage diode with reduced parasitic resistance and method for fabricating |
US20080197378A1 (en) * | 2007-02-20 | 2008-08-21 | Hua-Shuang Kong | Group III Nitride Diodes on Low Index Carrier Substrates |
US8506114B2 (en) * | 2007-02-22 | 2013-08-13 | Cree, Inc. | Lighting devices, methods of lighting, light filters and methods of filtering light |
US8203260B2 (en) * | 2007-04-13 | 2012-06-19 | Intematix Corporation | Color temperature tunable white light source |
US20080252609A1 (en) * | 2007-04-16 | 2008-10-16 | Yan-Zhi Lu | Image display and touch input integration module |
US7703943B2 (en) * | 2007-05-07 | 2010-04-27 | Intematix Corporation | Color tunable light source |
US8038317B2 (en) | 2007-05-08 | 2011-10-18 | Cree, Inc. | Lighting device and lighting method |
BRPI0811561A2 (en) | 2007-05-08 | 2015-06-16 | Cree Led Lighting Solutions | Lighting device and lighting method |
CN101711326B (en) | 2007-05-08 | 2012-12-05 | 科锐公司 | Lighting device and lighting method |
WO2008137975A1 (en) | 2007-05-08 | 2008-11-13 | Cree Led Lighting Solutions, Inc. | Lighting device and lighting method |
JP2010527510A (en) | 2007-05-08 | 2010-08-12 | クリー エル イー ディー ライティング ソリューションズ インコーポレイテッド | Lighting device and lighting method |
JP5360857B2 (en) * | 2007-05-17 | 2013-12-04 | Necライティング株式会社 | Green light emitting phosphor, manufacturing method thereof, and light emitting device using the same |
US10389736B2 (en) | 2007-06-12 | 2019-08-20 | Icontrol Networks, Inc. | Communication protocols in integrated systems |
TWI365546B (en) * | 2007-06-29 | 2012-06-01 | Ind Tech Res Inst | Light emitting diode device and fabrication method thereof |
US7847309B2 (en) | 2007-07-16 | 2010-12-07 | GE Lighting Solutions, LLC | Red line emitting complex fluoride phosphors activated with Mn4+ |
US20090039375A1 (en) * | 2007-08-07 | 2009-02-12 | Cree, Inc. | Semiconductor light emitting devices with separated wavelength conversion materials and methods of forming the same |
US7863635B2 (en) * | 2007-08-07 | 2011-01-04 | Cree, Inc. | Semiconductor light emitting devices with applied wavelength conversion materials |
US7591564B1 (en) * | 2007-08-28 | 2009-09-22 | Ball Bradley A | Underwater lighting system |
JP5122268B2 (en) * | 2007-08-30 | 2013-01-16 | 凸版印刷株式会社 | Liquid crystal display device and color filter used therefor |
RU2423756C1 (en) * | 2007-08-30 | 2011-07-10 | Нития Корпорейшн | Light-emitting device |
US8519437B2 (en) * | 2007-09-14 | 2013-08-27 | Cree, Inc. | Polarization doping in nitride based diodes |
DE102008012316B4 (en) * | 2007-09-28 | 2023-02-02 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Semiconductor light source with a primary radiation source and a luminescence conversion element |
CN101821544B (en) * | 2007-10-10 | 2012-11-28 | 科锐公司 | Lighting device and method of making |
US9012937B2 (en) * | 2007-10-10 | 2015-04-21 | Cree, Inc. | Multiple conversion material light emitting diode package and method of fabricating same |
US8119028B2 (en) * | 2007-11-14 | 2012-02-21 | Cree, Inc. | Cerium and europium doped single crystal phosphors |
WO2009069345A1 (en) | 2007-11-30 | 2009-06-04 | Nichia Corporation | Phosphor, light-emitting device using the same, and method for producing phosphor |
CN101925665B (en) * | 2008-01-21 | 2013-04-03 | 日亚化学工业株式会社 | Light emitting device |
US20090189168A1 (en) * | 2008-01-29 | 2009-07-30 | Kai-Shon Tsai | White Light Emitting Device |
DE102008029191A1 (en) * | 2008-01-31 | 2009-08-06 | Osram Opto Semiconductors Gmbh | Illumination device for backlighting a display and a display with such a lighting device |
US7829358B2 (en) * | 2008-02-08 | 2010-11-09 | Illumitex, Inc. | System and method for emitter layer shaping |
US9287469B2 (en) * | 2008-05-02 | 2016-03-15 | Cree, Inc. | Encapsulation for phosphor-converted white light emitting diode |
US8240875B2 (en) * | 2008-06-25 | 2012-08-14 | Cree, Inc. | Solid state linear array modules for general illumination |
JP2010021202A (en) * | 2008-07-08 | 2010-01-28 | Ushio Inc | Light emitting device |
JP2010027645A (en) * | 2008-07-15 | 2010-02-04 | Ushio Inc | Light emitting device and fabrication process therefor |
KR101266205B1 (en) | 2008-07-08 | 2013-05-21 | 우시오덴키 가부시키가이샤 | Light emitting device and method for manufacturing the same |
JP5301904B2 (en) * | 2008-07-09 | 2013-09-25 | ウシオ電機株式会社 | Light emitting device |
KR101266226B1 (en) * | 2008-07-09 | 2013-05-21 | 우시오덴키 가부시키가이샤 | Light emitting device and method for manufacturing the same |
DE102008047933A1 (en) | 2008-09-19 | 2010-04-15 | Osram Gesellschaft mit beschränkter Haftung | Lighting device with a light emitting diode |
TW201034256A (en) * | 2008-12-11 | 2010-09-16 | Illumitex Inc | Systems and methods for packaging light-emitting diode devices |
KR20100070731A (en) * | 2008-12-18 | 2010-06-28 | 삼성전자주식회사 | Halosilicate phosphors and white light emitting devices including same |
JP5310087B2 (en) * | 2009-02-26 | 2013-10-09 | 日亜化学工業株式会社 | Phosphor and light emitting device using the same |
KR101004713B1 (en) * | 2009-04-22 | 2011-01-04 | 주식회사 에피밸리 | Method for dimming control of a display |
JP5326777B2 (en) * | 2009-04-27 | 2013-10-30 | 日亜化学工業株式会社 | Phosphor and method for producing the same |
US8921876B2 (en) * | 2009-06-02 | 2014-12-30 | Cree, Inc. | Lighting devices with discrete lumiphor-bearing regions within or on a surface of remote elements |
US8415692B2 (en) | 2009-07-06 | 2013-04-09 | Cree, Inc. | LED packages with scattering particle regions |
US8449128B2 (en) * | 2009-08-20 | 2013-05-28 | Illumitex, Inc. | System and method for a lens and phosphor layer |
US8585253B2 (en) | 2009-08-20 | 2013-11-19 | Illumitex, Inc. | System and method for color mixing lens array |
TWI361216B (en) * | 2009-09-01 | 2012-04-01 | Ind Tech Res Inst | Phosphors, fabricating method thereof, and light emitting device employing the same |
RU2537442C2 (en) * | 2009-09-24 | 2015-01-10 | Конинклейке Филипс Электроникс Н.В. | System of floor covering including lighting system |
CN102630288B (en) | 2009-09-25 | 2015-09-09 | 科锐公司 | There is the lighting apparatus of low dazzle and high brightness levels uniformity |
US9435493B2 (en) | 2009-10-27 | 2016-09-06 | Cree, Inc. | Hybrid reflector system for lighting device |
WO2011068433A1 (en) * | 2009-12-04 | 2011-06-09 | Vishnyakov Anatoly Vasilyevich | Composite luminescent material for solid-state sources of white light |
US8604461B2 (en) * | 2009-12-16 | 2013-12-10 | Cree, Inc. | Semiconductor device structures with modulated doping and related methods |
US8536615B1 (en) | 2009-12-16 | 2013-09-17 | Cree, Inc. | Semiconductor device structures with modulated and delta doping and related methods |
CN102141721B (en) * | 2010-02-01 | 2012-07-18 | 鸿富锦精密工业(深圳)有限公司 | Projector |
US9275979B2 (en) | 2010-03-03 | 2016-03-01 | Cree, Inc. | Enhanced color rendering index emitter through phosphor separation |
US8684559B2 (en) | 2010-06-04 | 2014-04-01 | Cree, Inc. | Solid state light source emitting warm light with high CRI |
US8304797B2 (en) | 2010-07-29 | 2012-11-06 | Osram Sylvania Inc. | Light emitting diode light source having a ceramic substrate |
US8829777B2 (en) * | 2010-09-27 | 2014-09-09 | Osram Sylvania Inc. | Ceramic wavelength converter and LED light source containing same |
WO2012043567A1 (en) | 2010-09-28 | 2012-04-05 | 三菱化学株式会社 | Phosphor and light-emitting device using same |
US8556469B2 (en) | 2010-12-06 | 2013-10-15 | Cree, Inc. | High efficiency total internal reflection optic for solid state lighting luminaires |
US11251164B2 (en) | 2011-02-16 | 2022-02-15 | Creeled, Inc. | Multi-layer conversion material for down conversion in solid state lighting |
CN103682030B (en) * | 2012-09-07 | 2017-05-31 | 深圳市龙岗区横岗光台电子厂 | LED, LED matrix and LED manufacture crafts |
CN104241262B (en) | 2013-06-14 | 2020-11-06 | 惠州科锐半导体照明有限公司 | Light emitting device and display device |
LT6215B (en) | 2013-10-22 | 2015-08-25 | Vilniaus Universitetas | PHOTOBIOLOGICALLY FRIENDLY CONVERSION LEDs |
JP6682433B2 (en) * | 2013-11-13 | 2020-04-15 | エルジー イノテック カンパニー リミテッド | Blue-green phosphor, light emitting device package including the same, and lighting device |
JP2015188050A (en) * | 2014-03-12 | 2015-10-29 | 株式会社東芝 | light-emitting device |
DE102015206972A1 (en) * | 2015-04-17 | 2016-10-20 | Tridonic Jennersdorf Gmbh | LED module for emitting white light |
US9871173B2 (en) | 2015-06-18 | 2018-01-16 | Cree, Inc. | Light emitting devices having closely-spaced broad-spectrum and narrow-spectrum luminescent materials and related methods |
US9735323B2 (en) | 2015-06-30 | 2017-08-15 | Nichia Corporation | Light emitting device having a triple phosphor fluorescent member |
JP6384468B2 (en) | 2015-12-22 | 2018-09-05 | 日亜化学工業株式会社 | Light emitting device |
WO2017200097A1 (en) * | 2016-05-20 | 2017-11-23 | 株式会社 東芝 | White light source |
JP7237815B2 (en) * | 2017-02-27 | 2023-03-13 | シチズン電子株式会社 | Semiconductor light emitting device and lighting device |
JP2019016632A (en) | 2017-07-04 | 2019-01-31 | 日亜化学工業株式会社 | Light-emitting device |
JP6940764B2 (en) | 2017-09-28 | 2021-09-29 | 日亜化学工業株式会社 | Light emitting device |
JP7164800B2 (en) | 2017-09-28 | 2022-11-02 | 日亜化学工業株式会社 | light emitting device |
US10541353B2 (en) | 2017-11-10 | 2020-01-21 | Cree, Inc. | Light emitting devices including narrowband converters for outdoor lighting applications |
JP6891797B2 (en) * | 2017-12-21 | 2021-06-18 | 日亜化学工業株式会社 | Display device |
CN115315821A (en) | 2020-03-27 | 2022-11-08 | 日亚化学工业株式会社 | Light emitting device and lamp provided with same |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3875449A (en) | 1969-10-02 | 1975-04-01 | U S Radium Corp | Coated phosphors |
US3602753A (en) * | 1970-02-02 | 1971-08-31 | Sylvania Electric Prod | Cathode ray tube screen comprising a single phosphor system |
US4405880A (en) * | 1981-06-11 | 1983-09-20 | North American Philips Consumer Electronics Corp. | Data display CRT having a yellow-emitting screen |
DE3248448A1 (en) * | 1982-12-29 | 1984-07-05 | Philips Patentverwaltung Gmbh, 2000 Hamburg | FLUORESCENT FOR CATHODE RADIATION TUBES |
DE3669728D1 (en) * | 1985-05-01 | 1990-04-26 | Philips Corp | LUMINESCENT EARTH ALKALINE METAL SILICATE AND A LOW-PRESSURE MERCURY STEAM LAMP CONTAINING SUCH A SILICATE. |
JPH0586364A (en) * | 1991-09-27 | 1993-04-06 | Toshiba Lighting & Technol Corp | Fluorescent lamp |
KR100277050B1 (en) * | 1995-08-31 | 2001-01-15 | 이시즈까 가즈오 | Green-emitting phosphors and cathode ray tubes using them |
DE19638667C2 (en) | 1996-09-20 | 2001-05-17 | Osram Opto Semiconductors Gmbh | Mixed-color light-emitting semiconductor component with luminescence conversion element |
TW383508B (en) | 1996-07-29 | 2000-03-01 | Nichia Kagaku Kogyo Kk | Light emitting device and display |
JPH10163535A (en) * | 1996-11-27 | 1998-06-19 | Kasei Optonix Co Ltd | White light-emitting element |
DE59814117D1 (en) * | 1997-03-03 | 2007-12-20 | Philips Intellectual Property | WHITE LUMINESCENCE DIODE |
US6294800B1 (en) * | 1998-02-06 | 2001-09-25 | General Electric Company | Phosphors for white light generation from UV emitting diodes |
US6255670B1 (en) * | 1998-02-06 | 2001-07-03 | General Electric Company | Phosphors for light generation from light emitting semiconductors |
US6278135B1 (en) * | 1998-02-06 | 2001-08-21 | General Electric Company | Green-light emitting phosphors and light sources using the same |
WO2000057490A1 (en) * | 1999-03-19 | 2000-09-28 | Eurolight Illumination Technologies Gmbh | Lamp |
KR20010080796A (en) * | 2000-01-07 | 2001-08-25 | 허영덕 | Fluorescence Material for the use of white color emitting and preparation thereof and the white color emitting method therefor |
-
2001
- 2001-05-23 JP JP2002500459A patent/JP4695819B2/en not_active Expired - Lifetime
- 2001-05-23 CN CNB018014879A patent/CN1203557C/en not_active Expired - Fee Related
- 2001-05-23 KR KR1020027001040A patent/KR100784573B1/en active IP Right Grant
- 2001-05-23 EP EP01943141A patent/EP1206802B1/en not_active Expired - Lifetime
- 2001-05-23 WO PCT/DE2001/001955 patent/WO2001093342A1/en active IP Right Grant
- 2001-05-23 DE DE50113755T patent/DE50113755D1/en not_active Expired - Lifetime
- 2001-05-23 CA CA002380444A patent/CA2380444A1/en not_active Abandoned
- 2001-05-23 US US10/031,578 patent/US6504179B1/en not_active Expired - Lifetime
- 2001-05-28 TW TW090112781A patent/TW555832B/en not_active IP Right Cessation
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KR100784573B1 (en) | 2007-12-10 |
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EP1206802B1 (en) | 2008-03-19 |
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TW555832B (en) | 2003-10-01 |
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