CPC H01L 51/0067 (2013.01) [C07F 15/0033 (2013.01); C09K 11/06 (2013.01); H01L 51/0068 (2013.01); H01L 51/0085 (2013.01); H01L 51/0094 (2013.01); C07D 209/82 (2013.01); C07D 239/70 (2013.01); C07D 333/76 (2013.01); C09K 2211/1007 (2013.01); C09K 2211/1029 (2013.01); C09K 2211/1088 (2013.01); C09K 2211/185 (2013.01); H01L 51/0071 (2013.01); H01L 51/0073 (2013.01); H01L 51/5016 (2013.01)] | 20 Claims |
1. A compound comprising a first ligand LA having Formula I:
wherein RB represents mono to the possible maximum number of substitution, or no substitution;
wherein A1, A2, A3, and A4 are each independently CR or N;
wherein A5, A6, A7, and A8 are each independently CR or N, and at least two adjacent A1, A2, A3, A4, A5, A6, A7, and A8 are CR and the Rs are joined together to form a six-membered ring fused to ring A or ring C;
wherein X is O, S, or Se;
wherein each R and RB is independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof;
wherein any adjacent substituents are optionally joined or fused into a ring;
wherein the ligand LA is coordinated to a metal M;
wherein the metal M is bonded to ring A through a M-C bond;
wherein the metal M can be coordinated to other ligands; and
wherein the ligand LA is optionally linked with other ligands to comprise a tridentate, tetradentate, pentadentate or hexadentate ligand.
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