Patent ID: 8703304

Claim:
An organic electroluminescence device which comprises one or more organic thin film layers including at least one light emitting layer sandwiched between a cathode and an anode, wherein at least one of the organic thin film layers is a hole transporting layer which comprises at least one aromatic amine compound represented by formula (1): wherein Ar 1 is represented by formula (2): wherein R 1 and R 2 each independently represents a substituted or unsubstituted aryl group having the number of carbon atoms of 6 to 50 forming the aromatic ring, or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms respectively; a represents an integer of 0 to 4; b represents an integer of 0 to 3; c represents an integer of 1 to 3; plural R 1 's or R 2 's together may be bonded to each other to form a saturated or unsaturated, five- or six-membered ring structure which may be substituted; Ar 4 represents a substituted or unsubstituted arylene group having the number of carbon atoms of 6 to 50 forming the aromatic ring, or a substituted or unsubstituted fluorenylene group; Ar 2 is represented by formula (3): wherein R 3 to R 5 are each independently a substituted or unsubstituted aryl group having the number of carbon atoms of 6 to 50 forming the aromatic ring, or a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms; e and f each independently represents an integer of 0 to 4; g represents an integer of 0 to 5; and two R 3 's, two R 4 's, two R 5 's, R 3 and R 4 , or R 4 and R 5 may be bonded to each other to form a saturated or unsaturated, five- or six-membered ring structure which may be substituted; and Ar 3 is a group represented by formula (2), a group represented by formula (3), or a substituted or unsubstituted aryl group having the number of carbon atoms of 6 to 50 forming the aromatic ring wherein the substituent is an aryl group having the number of carbon atoms of 6 to 50 forming the aromatic ring or an alkyl group having 1 to 50 carbon atoms, with the proviso that it does not include the structure of formula (3).