Patent ID: 6929872

Claim:
A triarylamine derivative represented by general formula (1) wherein Ar 1, Ar 2 and Ar 3 are independently phenyl group, phenyl group containing a lower alkyl substituent, phenyl group containing a lower alkoxy substituent, cyanophenyl group, phenoxyphenyl group, halophenyl group, naphthyl group, naphthyl group containing a lower alkyl substituent, naphthyl group containing a lower alkoxy substituent, cyanonaphthyl group, halonaphthyl group, fluorenyl group, carbazolyl group, carbazolyl group containing a lower alkyl substituent, biphenylyl group, biphenylyl group containing a lower alkyl substituent, biphenylyl group containing a lower alkoxy substituent, thiophenyl group, indolyl group, pyridyl group or 9-phenanthryl group represented by general formula (2) and at least two of Ar 1, Ar 2 and Ar 3 are 9-phenanthryl groups represented by general formula (2); wherein R 1 -R 9 are independently hydrogen, halogen, alkyl group, cyano group, acyl group, alkoxycarbonyl group, alkoxy group, alkylsulfonyl group, or haloalkyl group.