Patent ID: 8409729

Claim:
A compound of Formula I comprising: wherein Ar and Ar′ are independently selected from the group consisting of phenyl, biphenyl, naphthyl, dibenzothiophene, and dibenzofuran, which are optionally further substituted; wherein Z is selected from Si and Ge; wherein L is a single bond or comprises aryl, amino, or combinations thereof; wherein L is optionally further substituted; wherein A is a group directly bonded to Z and is selected from the group consisting of dibenzofuran, dibenzothiophene, azadibenzofuran, azadibenzothiophene, dibenzoselenophene, azadibenzoselenophene, and combinations thereof, which are optionally further substituted with at least one group selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, aryl, aryloxy, arylthio, arylseleno, pyridine, triazine, imidazole, benzimidazole, nitrile, isonitrile, and combinations thereof, and wherein the substitution is optionally fused to the group directly bonded to Z; and wherein B contains a group selected from the group consisting of carbazole, azacarbazole, and combinations thereof, which are optionally further substituted with at least one group selected from the group consisting of 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, and wherein the substitution is optionally fused to the carbazole or azacarbazole group.