Patent ID: 7906169

Claim:
A method of manufacturing an organic light emitting device, the method comprising: mixing a first electrically neutral emissive material in a first organic solvent to make a first mixed solution; coating a substrate with the first mixed solution to form a first-coated layer; mixing a second electrically neutral emissive material in a second organic solvent to make a second mixed solution; coating the first-coated layer with the second mixed solution to form a second-coated layer, the first-coated layer being dissolved into the second organic solvent; and heat-treating the substrate, on which the first-coated layer and the second-coated layer are formed, to form a single emissive layer, an n o −n e parameter of the single emissive layer being greater than an n o −n e parameter of the first-coated layer, where n o is an ordinary refractive index and n e is a extraordinary refractive index.