The invention provides an electroluminescent device having a structure that may include a light-emitting layer composed of, for example, at least an organic polymer between an anode and a cathode, and may also include a thin-film layer disposed between the light-emitting layer and the cathode, the thin-film...http://www.google.co.uk/patents/US7061176?utm_source=gb-gplus-sharePatent US7061176 - Electroluminescent device having a thin-film layer, and electronic device having the electroluminescent device
