Organic electroluminescent materials and devices

摘要

A compound having a formula M(LA)x(LB)y(LC)z, where ligand LA is;
ligand LB is
;
and ligand LC is
;
is disclosed. In the structure of M(LA)x(LB)y(LC)z, M is a metal; x is 1, or 2; y and z are 0, 1, or 2; X1, X2, X3, X4, X5, X6, X7, and X8 are each independently C or N; rings C and D are each independently a 5 or 6-membered carbocyclic or heterocyclic ring; two adjacent RB form a six-member aromatic carbocyclic or heterocyclic ring E fused to ring B and, when ring E is heterocyclic, the only heteroatom is nitrogen; and ring E can be further substituted by RE. Additionally, any adjacent substituents R11, R12, RB, RC, RD, RE, R1, R2, R3, R4, R′ and R″ are optionally joined to form a ring. Formulations and devices that include the compound of formula M(LA)x(LB)y(LC)z, are also described.

主权项

1. 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.