Patent ID: 9048440
Filing Date: 2015-06-02
Classification: C09K,H01L,H05B

Abstract:
1. A material for an organic electroluminescence device, which comprises: (a) a phosphorescent metal complex represented by the following formula (A10-1): wherein, each of R 1a to R 1i independently represents a hydrogen atom or a substituent, (b) a structural isomer represented by the same chemical formula as that of the phosphorescent metal complex (a) but different sterically in a coordination method of the ligand, wherein the structural isomer (b) is contained in an amount of 0.05 mass % or greater but not greater than 1 mass % relative to the phosphorescent metal complex (a), wherein the structural isomer of phosphorescent metal complex (a) is a facial isomer, while the structural isomer (b) is a meridional isomer.