| abstract |
The present disclosure relates to organic electroluminescent materials and organic electroluminescent devices, in particular, discloses a compound of formula (1), wherein R 1 , R 2 , R 3 and R 4 are each independently selected from hydrogen, a substituted or unsubstituted C 1-20 alkyl, a substituted or unsubstituted C 3-20 cycloalkyl, a substituted or unsubstituted aromatic hydrocarbyl, or a substituted or unsubstituted aromatic heterocyclic group; and at least one of R 1 , R 2 , R 3 and R 4 contains a group having a hole-transporting ability; and at least one of R 1 , R 2 , R 3 and R 4 contains a group having an electron-transporting ability; A and B each independently represent hydrogen, a substituted or unsubstituted, fused aromatic ring, or a substituted or unsubstituted, fused heteroaromatic ring containing a heteroatom(s) selected from O, N and S. |