| abstract |
The present disclosure provides phenyl biphenylpyrimidine compounds of formula (I) and an organic electroluminescent device using the same: n n n n n n n n n n wherein X1 and A1 each independently represents substituted or unsubstituted C6-30 aryl or substituted or unsubstituted C5-30 heteroaryl having at least one heteroatom selected from the group consisting of N, O, and S, and n represents an integer of 1 or 2. |