Patent ID: 6124024
Filing Date: 2000-09-26
Classification: H01L,H05B,Y10S,Y10T

Abstract:
An organic electroluminescence device comprising:a transparent substrate, a transparent electrode having a refractive index of 1.80 or more, an electroluminescent organic multi-layer part having a refractive index of 1.6 to 1.8 which emits electroluminescent light, and a cathode, which components are laminated in this order and which layer configuration selectively reflects a wavelength band of electroluminescent light, wherein the organic multi-layer part comprises an adhesion improving layer laminated to said cathode, wherein the optical thickness of the organic multi-layer part and the transparent electrode expressed as the sum: are set at values which satisfy the equation: 4.pi./.lambda.=2m.pi. or (2m-1).pi., where (nd).sub.1 indicates the optical thickness of the organic multi-layer part, (nd).sub.2 indicates the optical thickness of the transparent electrode, m is an integer of 1 to 10, n is the refractive index of each respective part, d is the thickness of each respective part, and .lambda. is the central wavelength of the selectively reflected band of electroluminescent light, the choice of the 2m.pi. equation or the (2m-1).pi. equation being dependent on the refractive index of the cathode relative to the refractive index of the organic multi-layer part, and the optical thickness values (nd).sub.1 and (nd).sub.2 being set so that the central wavelength .lambda. of the selectively reflected band of electroluminescent light has a specific wavelength value within a wavelength range of 440 to 490 nm, 500 to 550 nm or 600 to 650 nm.