| 摘要 |
PROBLEM TO BE SOLVED: To provide high luminance and stable red color light emission by including at least one kind of indole compound in an organic layer as an organic light emitting material. SOLUTION: A compound expressed by formula I is used as an indole compound contained in an organic layer. In formula I, R1, R2, R3 and R4 are mutually the same or different groups, and are an aryl group expressed by formula II. Here, in formula II, R11, R12, R13, R14 and R15 are mutually the same or different groups, and are a hydrogen atom or at least one of them is a saturated or unsaturated alkoxyl group, an alkyl group, an amino group or an alkyl amino group. The alkyl group is desirably a methyl group and a t-butyl group. In formula I, R5, R6, R7 and R8 are mutually the same or different groups, and at least one of them is a cyano group, a nitro group or a halogen atom.
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