Organic electroluminescent materials and devices

A first device comprising a first organic light emitting device, the 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 a formula M(LA)x(LB)y(LC)z:
• wherein ligand LA is
• wherein ligand LB is
• wherein ligand LC is
• wherein M is a metal having an atomic number greater than 40;
• wherein x is 1, or 2;
• 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 X1, X2, X3, X4, X5, X6, X7, and X8 are each independently C or N;
• wherein rings C and D are each independently a 5 or 6-membered carbocyclic or heterocyclic ring;
• wherein RB represents di, tri, or tetra-substitution;
• wherein RC, RD, and R4 each independently represent mono, di, tri, or tetra-substitution, or no substitution;
• wherein two adjacent RB form a six-member aromatic carbocyclic or heterocyclic ring E fused to ring B;
• wherein, when ring E is heterocyclic, the only heteroatom is nitrogen;
• wherein ring E can be further substituted by RE;
• wherein RE represents mono, di, tri, or tetra-substitution, or no substitution;
• wherein R11 is selected from the group consisting of 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 each of R12, RB, RC, RD, RE, R1, R2, R3, R4, R′ and R″ are 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 R11, R12, RB, RC, RD, RE, R1, R2, R3, R4, R′ and R″ are optionally joined to form a ring.

A formulation comprising a compound having a formula M(LA)x(LB)y(LC)z:

• wherein ligand LA is
• wherein ligand LB is
• wherein ligand LC is
• wherein M is a metal having an atomic number greater than 40;
• wherein x is 1, or 2;
• 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 X1, X2, X3, X4, X5, X6, X7, and X8 are each independently C or N;
• wherein rings C and D are each independently a 5 or 6-membered carbocyclic or heterocyclic ring;
• wherein RB represents di, tri, or tetra-substitution;
• wherein RC, RD, and R4 each independently represent mono, di, tri, or tetra-substitution, or no substitution;
• wherein two adjacent RB form a six-member aromatic carbocyclic or heterocyclic ring E fused to ring B;
• wherein, when ring E is heterocyclic, the only heteroatom is nitrogen;
• wherein ring E can be further substituted by RE;
• wherein RE represents mono, di, tri, or tetra-substitution, or no substitution;
• wherein R11 is selected from the group consisting of 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 each of R12, RB, RC, RD, RE, R1, R2, R3, R4, R′ and R″ are 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 R11, R12, RB, RC, RD, RE, R1, R2, R3, R4, R′ and R″ are optionally joined to form a ring.