| abstract |
The present disclosure provides a novel compound of formula (I) and organic electroluminescent devices using the same: n n n n n n n n n n wherein, X 1 and A 1 each independently represent a substituted or unsubstituted (C6-C30) aryl, a substituted or unsubstituted 5- to 30-membered heteroaryl; and n is an integer of 1 or 2, and when n is 1, X 1 is the substituted or unsubstituted (C6-C30) aryl. |