A metal iridium complexes, devices containing the same, and formulations including the same described. The complexes can have the formula Ir(L1)n(L2)3−n, wherein the first ligand L1 has Formula I, the second ligand L2 has Formula II, L1 is different from L2; R1 is a partially or fully deuterated group consisting of alkyl and cycloalkyl; R2 represents mono, di, tri substitutions or no substitution; R3, R4 and R5 each represent mono, di, tri, tetra substitutions or no substitution; R2 and R3 are each independently selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, and combinations thereof; R4 and R5 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 n is 1 or 2. Homoleptic, tris-iridium complex including deuterated alkyl groups are also described.