| 主权项 |
1. A compound comprising a ligand L of Formula I: wherein Y is a carbon or nitrogen; wherein R has a structure of Formula IIand uses two adjacent carbons from the four carbons marked with * to fuse to ring B;
wherein, when R is fused to Y, Y is carbon; wherein X is selected from the group consisting of NR′, CR′R″, SiR′R″, O, S and Se; wherein ring A is a 5-membered or 6-membered carbocyclic or heterocyclic ring; wherein Z is nitrogen or carbon; wherein R1, R2, R3, and R4 each independently represents from mono-substitution to the possible maximum number of substitution, or no substitution; wherein R1, R2, R3, R4, R′ and R″ are each independently 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; wherein any two adjacent substituents of R1, R2, R3, R4, R′ and R″ are optionally joined to form a ring; wherein the ligand L is coordinated to a metal M; and wherein the ligand L is optionally linked with other ligands to comprise a tridentate, tetradentate, pentadentate or hexadentate ligand. |
