Patent ID: 7615921

Claim:
An organic electroluminescent devices, comprising: a metal electrode; a transparent electrode; an organic electroluminescent light-emitting layer between the metal electrode and the transparent electrode; a transparent electrically conductive film on a surface of the metal electrode, on the organic electroluminescent light-emitting layer side thereof, first means, disposed between the organic electroluminescent light-emitting layer and the transparent electrically conductive film, for injecting first carriers and transporting the first carriers to the organic electroluminescent light-emitting layer, the first means comprising at least one layer of material; second means, disposed between the organic electroluminescent light-emitting layer and the transparent electrode, for injecting second carriers and transporting the second carriers to the organic electroluminescent light-emitting layer, the first means comprising at least one further layer of material, wherein the first carriers are one of holes and electrons and the second carriers are the other of holes and electrons; and wherein the transparent electrically conductive film has a thickness that is set so as to satisfy the following equation, where L is the optical distance from the organic light-emitting layer to the metal electrode, and λ is the wavelength of light emitted by the organic light-emitting layer: L =(2 n+ 1)λ/4 ( n= 0,1,2, . . . ).