METHOD OF PRODUCING COMPOSITION FOR USE IN ORGANIC ELECTROLUMINESCENT ELEMENT, COMPOSITION FOR USE IN ORGANIC ELECTROLUMINESCENT ELEMENT, METHOD OF PRODUCING ORGANIC ELECTROLUMINESCENT ELEMENT, ORGANIC ELECTROLUMINESCENT ELEMENT, ORGANIC EL DISPLAY DEVICE, AND ORGANIC EL LIGHTING

摘要

To provide a process of producing an organic electroluminescence element having a high current efficiency and a long drive life by a wet film formation process. The present invention relates to a process of producing an organic electroluminescence element composition, comprising a filtration step of filtering a solution containing an organic electroluminescence element material and a solvent, wherein the composition is obtained after a time-elapsing step wherein 8 hours or more elapses after the filtration step, and the composition is used for a wet film formation of an organic layer in an organic electroluminescence element.