Patent ID: 9627638
Date: 2017-04-18
CPC Classifications: C09K,H01L,H05B

Claim:
1. An organic electroluminescence device comprising: an anode, a cathode, an organic layer disposed between the anode and the cathode, the organic layer containing a hole injection layer, a hole transport layer and an emission layer containing a host material, wherein the hole injection layer, the hole transport layer and the emission layer each contain a phosphorescent light-emitting material, wherein the phosphorescent light-emitting material in the hole injection layer, the hole transport layer and the emission layer are each the same, wherein the hole injection layer contains the phosphorescent light-emitting material in an amount of 10% by mass or more but less than 50% by mass, and wherein a concentration of the phosphorescent light-emitting material contained in the hole transport layer is lower than that in the hole injection layer, and a concentration of the phosphorescent light-emitting material contained in the emission layer is lower than that in the hole injection layer and higher than that in the hole transport layer, wherein the host material is selected from the group consisting of a compound represented by General Formula (2) or General Formula (3): where R represents a t-butyl group, a t-amyl group, a trimethylsilyl group, or a triphenylsilyl group, and R where R represents a t-butyl group, a t-amyl group, a trimethylsilyl group, a triphenylsilyl group or a phenyl group, and R