| 摘要 |
PROBLEM TO BE SOLVED: To improve emission stability and preservation stability of an organic EL element. SOLUTION: A hexaamine compound of the formula (I) is used as a material of the hole transport layer. Provided that, R1 , R2 express hydrogen atom, lower alkyl group, lower alkoxy group, and substituted or unsubstituted aryl group, and R3 expresses hydrogen atom, methyl group, methoxy group, and chlorine atom. And X expresses a substituted group having the structure as the formula (II). In the formula (II), R4 expresses hydrogen atom, methyl group, methoxy group and chlorine atom.
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