Light emitting diodes include a substrate having first and second opposing faces and that is transparent to optical radiation in a predetermined wavelength range and that is patterned to define, in cross-section, a plurality of pedestals that extend into the substrate from the first face towards the...http://www.google.co.uk/patents/US7026659?utm_source=gb-gplus-sharePatent US7026659 - Light emitting diodes including pedestals
