Organic electroluminescent element and its manufacturing method

1. 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 layer 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, two layers of the light emission layer and the at least one layer being adjacent to each other, the method comprising (a) providing a first coating solution employing a first organic solvent for one layer of the two layers, a second coating solution employing a second solvent for the other layer of the two layers, and a third solvent, the third solvent being immiscible with both the first solvent and second solvent; (b) simultaneously coating the first and second coating solutions, and the third solvent on a substrate so that the third solvent is in contact with the first and second coating solutions and is provided between the first coating solution and the second coating solution; and (c) drying the coating solutions to form the two layers on the substrate.

2. The method of claim 1 , wherein one of the first and second solvents is water and the other is an organic solvent.

3. The method of claim 1 , further comprising the step of forming a layer other than the two layers on the substrate according to a method selected from the group consisting of a vacuum deposition method, an ink jet method, a printing method and a spin coating method.

4. The method of claim 1 , wherein the simultaneously coating is carried out employing a slide coating method or a slot coating method.

5. The method of claim 1 , wherein the substrate is flexible.