Patent ID: 7132789
Filing Date: 2006-11-07
Classification: H01L

Abstract:
1. An organic electroluminescent (EL) device which includes a plurality of light-emitting elements comprising: a light-transmitting layer including a transparent electrode, a first insulating layer having a refractive index about equal to that of the transparent electrode, a counter electrode having an optical reflectance; and an organic functional layer including a hole injecting layer and a light-emitting layer disposed between the light-transmitting layer and the counter electrode; wherein in green light-emitting elements among the plurality of light-emitting elements, a first optical length, which is the sum of the product of film thickness and refractive index of the hole injecting layer and the product of film thickness and refractive index of the light-emitting layer, is 250 nm or less, in blue light-emitting elements, a second optical length, which is the sum of the product of film thickness and refractive index of the hole injecting layer and the product of film thickness and refractive index of the light-emitting layer, is 230 nm or less, and the light-transmitting layer has a refractive index larger than the refractive index of the transparent substrate, and a third optical length, which is the product of film thickness and refractive index of the light-transmitting layer, is 300 nm or less.