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:
• Formula I;
• wherein:
• moiety A is a monocyclic ring comprising one 5-membered or 6-membered carbocyclic or heterocyclic ring, or a multicyclic fused ring system comprising at least two fused 5-membered or 6-membered carbocyclic or heterocyclic rings;
• one of X1, X2, and X3 is C and is connected to X4;
• one of X1, X2, and X3 is N and is coordinated to a metal M;
• and the remaining one of X1, X2, and X3 is CR or N;
• X4 is C or N;
• Y is selected from the group consisting of O, S, Se, NR, BR, BRR′, CRR′, SiRR′, GeRR′, C═O, C═CRR′, and C═NR;
• each of RA and RB independently represents mono to the maximum allowable substitution, or no substitution;
• each R, R′, RA, and RB is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;
• K1 and K2 are each independently selected from the group consisting of a direct bond, O, and S;
• LA is coordinated to a metal M via the indicated dashed lines;
• metal M is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au;
• LA can be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, and hexadentate ligand;
• and
• any two substituents can be joined or fused to form a ring.

A consumer product comprising 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:
• Formula I;
• wherein:
• moiety A is a monocyclic ring comprising one 5-membered or 6-membered carbocyclic or heterocyclic ring, or a multicyclic fused ring system comprising at least two fused 5-membered or 6-membered carbocyclic or heterocyclic rings;
• one of X1, X2, and X3 is C and is connected to X4;
• one of X1, X2, and X3 is N and is coordinated to a metal M;
• and the remaining one of X1, X2, and X3 is CR or N;
• X4 is C or N;
• Y is selected from the group consisting of O, S, Se, NR, BR, BRR′, CRR′, SiRR′, GeRR′, C═O, C—CRR′, and C═NR;
• each of RA and RB independently represents mono to the maximum allowable substitution, or no substitution;
• each R, R′, RA, and RB is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;
• K1 and K2 are each independently selected from the group consisting of a direct bond, O, and S;
• LA is coordinated to a metal M via the indicated dashed lines;
• metal M is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au;
• LA can be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, and hexadentate ligand;
• and
• any two substituents can be joined or fused to form a ring.