Patent ID: 7699680

Claim:
A method of manufacturing an organic electroluminescent element comprising a substrate and provided thereon, a light emission layer containing a light emission material and at least one adjacent layer selected from the group consisting of a hole injecting layer containing a hole injecting material, a hole transporting layer containing a hole transporting material, an electron injecting layer containing an electron injecting material, and an electron transporting layer containing an electron transporting material, the method comprising the steps of (a) providing a first coating solution employing a first organic solvent for a selected one of the light emission layer and the at least one adjacent layer and a second coating solution employing a second solvent for the other one of the selected one of the light emission layer and the at least one adjacent layer, the first solvent being immiscible with the second solvent; (b) simultaneously coating the first and second coating solutions on the substrate so that the first coating solution is in contact with the second coating solution; and (c) drying the coating solutions to form the light emission layer and the at least one adjacent layer on the substrate, wherein the first solvent being immiscible with the second solvent is such that after the first solvent is added to the second solvent in the same amount as the first solvent at 25° C. while stirring, and allowed to stand at 25° C. for 30 to 60 minutes, the resulting liquid is separated into two liquid phases to form an interface between the two liquid phases.