| abstract |
An object of the present invention is to provide a long-life organic EL device, in addition to lowering a driving voltage. The aromatic amine derivative of the present invention is represented by the following formula (1); In the formula (1), Ar 1 and Ar 2 are an aryl group or a heteroaryl group; L 1 and L 2 are a single bond, an arylene group or a heteroarylene group; R 1 to R 4 independently represent an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, an aralkyl group, an aryloxy group, an arylthio group, an alkoxycarbonyl group, a halogen atom, a cyano group, a nitro group, Or a carboxyl group; a and b are integers from 0 to 4; R 5 to R 12 are a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group or a silyl group. However, R 5 and R 7 is not at least any one of a hydrogen atom, if R 5 is not hydrogen atom is R 6 is not a hydrogen atom, when R 7 is not hydrogen atom R 8 is not a hydrogen atom. |