A first compound capable of functioning as an emitter in an organic light emitting device at room temperature and is a metal coordination complex having a metal-carbon bond, wherein the metal is selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Au, and Cu; wherein the first compound has the formula of M(L 1) x (L 2) y (L 3) z; wherein L 1, L 2 and L 3 can be the same or different; wherein at least one of L 1, L 2 and L 3 is not acetylacetonate ligand; wherein x is 1, 2, or 3; wherein y is 0, 1, or 2; wherein z is 0, 1, or 2; wherein x+y+z is the oxidation state of the metal M; wherein L 1, L 2 and L 3 are each independently selected from the group consisting of: wherein each X 1 to X 17 are independently selected from the group consisting of carbon and nitrogen; wherein X is selected from the group consisting of BR', NR', PR', O, S, Se, C=O, S=O, SO 2, CR'R", SiR'R", and GeR'R"; wherein R' and R" are optionally fused or joined to form a ring; wherein each R a, R b, R c, and R d may represent from mono substitution to the possible maximum number of substitution, or no substitution; wherein R', R", R a, R b, R c, and R d 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; and wherein any two adjacent substituents of R a, R b, R c, and R d are optionally fused or joined to form a ring or form a multidentate ligand; and wherein at least one of the R a, R b, R c, and R d includes at least one R; wherein each of the at least one R is directly bonded to one of the aromatic rings; wherein each of the at least one R has the formula of wherein L is a direct bond or an organic linker; wherein X 1 and X 2 are each independently selected from the group consisting of carbon and silicon; wherein R 1 and R 2 each represent mono to the possible maximum number of substitution, or no substitution; wherein R 1 to R 6 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; and wherein any adjacent substituents of R 3 to R 6 are optionally joined or fused into a ring. wherein each X 1 to X 17 are independently selected from the group consisting of carbon and nitrogen; wherein X is selected from the group consisting of BR', NR', PR', O, S, Se, C=O, S=O, SO 2, CR'R", SiR'R", and GeR'R"; wherein R' and R" are optionally fused or joined to form a ring; wherein each R a, R b, R c, and R d may represent from mono substitution to the possible maximum number of substitution, or no substitution; wherein R', R", R a, R b, R c, and R d 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; and wherein any two adjacent substituents of R a, R b, R c, and R d are optionally fused or joined to form a ring or form a multidentate ligand; and wherein at least one of the R a, R b, R c, and R d includes at least one R; wherein each of the at least one R is directly bonded to one of the aromatic rings; wherein each of the at least one R has the formula of wherein L is a direct bond or an organic linker; wherein X 1 and X 2 are each independently selected from the group consisting of carbon and silicon; wherein R 1 and R 2 each represent mono to the possible maximum number of substitution, or no substitution; wherein R 1 to R 6 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; and wherein any adjacent substituents of R 3 to R 6 are optionally joined or fused into a ring.