Organic electroluminescent materials and devices

A first device comprising a first organic light emitting device, comprising:

• an anode;
• a cathode;
• and
• an organic layer, disposed between the anode and the cathode, comprising a compound having the formula Ir(L1)n(L2)3−n:
• wherein the ligand L1 is a first ligand having Formula I,
• wherein the ligand L2 is a second ligand having Formula II,
• wherein L1 is different from L2;
• wherein R1 is a partially or fully deuterated group selected from the group consisting of alkyl and cycloalkyl;
• wherein R2 represents mono, di, tri substitutions or no substitution;
• wherein R3, R4, and R5 each represent mono, di, tri, tetra substitutions or no substitution;
• wherein R2 and R3 are each independently selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, and combinations thereof,
• wherein 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,
• wherein at least one of R2, R3, R4, or R5 is alkyl;
• wherein two R4 can be joined or fused to form an aromatic ring;
• and
• wherein n is 1 or 2.

A heteroleptic iridium compound having the formula Ir(L1)n(L2)3−n:

• wherein the ligand L1 is a first ligand having Formula I,
• wherein the ligand L2 is a second ligand having Formula II,
• wherein L1 is different from L2;
• wherein R1 is a partially or fully deuterated group selected from the group consisting of alkyl and cycloalkyl;
• wherein R2 represents mono, di, tri substitutions or no substitution;
• wherein R3, R4, and R5 each represent mono, di, tri, tetra substitutions or no substitution;
• wherein R2 and R3 are each independently selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, and combinations thereof,
• wherein 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,
• wherein at least one of R2, R3, R4, or R5 is alkyl;
• wherein two R4 are joined or fused to form an aromatic ring;
• and
• wherein n is 1 or 2.