| 主权项 |
1. A compound having the formula: wherein Ar and Ar′ are independently selected from the group consisting of phenyl, biphenyl, naphthalene, dibenzothiophene and dibenzofuran, which are optionally further substituted; Z is selected from Si and Ge; L is a single bond or comprises an aryl or heteroaryl group having from 5-20 carbon atoms, which is optionally further substituted; B is a group selected from the group consisting of carbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, aza-carbazole, aza-dibenzofuran, aza-dibenzothiophene, azadibenzoselenophene, and combinations thereof, which are optionally further substituted with one or more groups selected from hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein the substitution is optionally fused to the carbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, aza carbazole, aza-dibenzofuran, aza-dibenzothiophene or azadibenzoselenophene group, wherein A is wherein K1 to K12 are independently selected from N and C—R; and wherein R′ is selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, aryl, aryloxy, and combinations thereof, wherein R′ does not exist on one of K1 to K4 when said one of K1 to K4 is bonded to Z is C. |
