Method for manufacturing organic electroluminescent device
View Patent ↗Disclosed is an organic EL device having high external quantum efficiency, long emission life and low driving voltage. Also disclosed are an illuminating device and a display. Specifically disclosed is an organic electroluminescent device comprising, on a supporting substrate, at least an anode, a cathode and an organic compound layer which is arranged between the anode and the cathode and includes at least one light-emitting layer. This electroluminescent device is characterized in that the anode, cathode and organic compound layer are respectively formed by coating.
1. A method of manufacturing an organic electroluminescent device comprising a cathode, an anode and a plurality of organic compound layers placed between the cathode and the anode, the method comprising:
forming at least two of the organic compound layers on the cathode or on the anode by a coating method,
wherein at least one of the organic compound layers other than the organic compound layer adjacent to the anode is formed by coating a dispersion and then subjecting the coated dispersion to a smoothing treatment, and
wherein the coated dispersion contains a component of the organic electroluminescent device dispersed in a solid state; and
organic compounds contained in the plurality of organic compound layers each has a dissolvable range of solubility parameter of from 8.3 to 10.6 (cal/cm 3 ) 1/2 and a solvent in the dispersion has a solubility parameter of from 7.0 to 8.2 or 10.7 (cal/cm 3 ) 1/2 to 23.0 (cal/cm 3 ) 1/2 .
2. The method of manufacturing an organic electroluminescent device of claim 1 , wherein the plurality of organic compound layers comprises at least three layers.
3. The method of manufacturing an organic electroluminescent device of claim 2 , wherein the at least three organic compound layers on top of each other are formed by the coating method.
4. The method for manufacturing an organic electroluminescent device of claim 3 , wherein glass transition temperatures of organic compounds in the three organic compound layers on top of each other are in a decreasing order of the glass transition temperatures from the layer nearest the anode.
5. The method for manufacturing an organic electroluminescent device described of claim 2 , wherein the at least three organic compound layers on top of each other are formed by the coating method using the dispersion and subjected to the smoothing treatment.
6. The method for manufacturing an organic electroluminescent device described of claim 1 , wherein all of the plurality of organic compound layers are formed by the coating method.
7. The method for manufacturing an organic electroluminescent device of claim 1 , wherein the coating liquid comprises a non-aqueous solvent.
8. The method for manufacturing an organic electroluminescent device described of claim 1 , wherein at least one of the plurality of organic compound layers comprises a phosphorescence emitting material.