Organic electroluminescent materials and devices

An organic light emitting device (OLED) comprising:

• an anode;
• a cathode;
• and
• an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound comprising a first ligand LA of Formula I:
• wherein:
• rings A, B, C, and D are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring;
• each RA, RB, RC, and RD independently represents mono to the maximum allowable substitution, or no substitution;
• L1 is selected from the group consisting of CR, SiR, GeR, N, and B;
• L2 is selected from the group consisting of CRR′, SiRR′, GeRR′, NR, O, S, Se, and C═X, wherein X is CRR′, O, or S;
• each of Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, and Z9 is independently C or N;
• each R, R′, RA, RB, RC, and RD is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, selenyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• LA is coordinated to a metal M through the indicated dashed lines;
• metal M can be coordinated to other ligands;
• LA can be joined with other ligands to comprise a pentadentate or hexadentate ligand;
• if L2 is NR where the R is joined or fused to an RC or an RD to form a ring, then LA is not joined to another ligand or ligands to form a hexadentate ligand;
• if LA is a hexadentate ligand, then at least one of Z1 or Z3 is C and the other one of Z1 or Z3 is N or carbene C;
• and
• any two R, R′, RA, RB, RC, and RD can be joined or fused to form a ring.

A consumer product comprising an organic light-emitting device comprising:

• an anode;
• a cathode;
• and
• an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a compound comprising a first ligand LA of Formula I:
• wherein:
• rings A, B, C, and D are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring;
• each RA, RB, RC, and RD independently represents mono to the maximum allowable substitution, or no substitution;
• L1 is selected from the group consisting of CR, SiR, GeR, N, and B;
• L2 is selected from the group consisting of CRR′, SiRR′, GeRR′, NR, O, S, Se, and C═X, wherein X is CRR′, O, or S;
• each of Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, and Z9 is independently C or N;
• each R, R′, RA, RB, RC, and RD is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, selenyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• LA is coordinated to a metal M through the indicated dashed lines;
• metal M can be coordinated to other ligands;
• LA can be joined with other ligands to comprise a pentadentate or hexadentate ligand;
• if L2 is NR where the R is joined or fused to an RC or an RD to form a ring, then LA is not joined to another ligand or ligands to form a hexadentate ligand;
• if LA is a hexadentate ligand, then at least one of Z1 or Z3 is C and the other one of Z1 or Z3 is N or carbene C;
• and
• any two R, R′, RA, RB, RC, and RD can be joined or fused to form a ring.