| 摘要 |
A compound of formula (I) wherein: X is0, S, NR11, CR11 2or SiR11 2wherein R11 in each occurrence is independently a substituent; R1is a substituent; R2, R3, and R4are each independently H or a substituent;R5and R6independently in each occurrence is a substituent;m independently in each occurrence is 0, 1 or 2; and n independently in each occurrence is 0, 1, 2, 3 or 4. The compound may be used as a host for a phosphorescent light-emitting material in an organic light-emitting device. |
