| 主权项 |
1. A compound having a formula selected from the group consisting of: wherein m is an integer from 0 to 20, n is an integer from 1 to 10; wherein when morn is more than 1, each R7 and R8 can be same or different; wherein R1 to R8 are each independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and wherein at least one of R1 to R8 comprises at least one chemical group selected from the group consisting of naphthalene, phenanthrene, pyridine, pyrimidine, pyrazine, triazine, furan, thiophene, imidazole, oxazole, thiazole, triphenylene, fluorene, indole, carbazole, benzothiophene, dibenzothiophene, benzofuran, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-fluorene, aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophene. |
