Patent ID: 8431250

Claim:
An aromatic amine derivative represented by the following formula (1): wherein R 1 to R 8 are independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 ring carbon atoms, a substituted or unsubstituted silyl group, a cyano group or a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, and Ar 1 to Ar 4 are independently a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, provided that at least one of Ar 1 to Ar 4 is a heterocyclic group represented by the following formula (2): wherein R 11 to R 17 are independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted silyl group, a cyano group, a substituted or unsubstituted aryl group having 6 to 20 ring carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 20 ring atoms, adjacent substituents of R 11 to R 17 may be bonded to form a saturated or unsaturated ring, and X 1 is an oxygen atom or a sulfur atom.