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 moiety X represents a fused multicyclic ring system comprising two or more 5-membered or 6-membered carbocyclic or heterocyclic rings;
• wherein rings A and B are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring;
• wherein Z1, Z2, and Z3 are each independently C or N;
• wherein K3 and K4 are each independently selected from the group consisting of a direct bond, O, and S;
• wherein each RA, RB, and RX represents mono to the maximum allowable substitution, or no substitution;
• wherein each RA, RB, and RX is independently a hydrogen or a substituent selected from the group consisting of deuterium, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, partially or fully fluorinated variants thereof, and combinations thereof;
• wherein at least one of the following conditions is true:
• (1) ring B is partially or fully deuterated, and
• (2) at least one RB is an aryl or heteroaryl group that is partially or fully deuterated;
• wherein LA is coordinated to a metal M through the indicated dashed lines to form a 5-membered or 6-membered chelate ring;
• wherein M may be coordinated to other ligands;
• wherein LA may be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand;
• wherein any two substituents may be joined or fused to form a ring;
• and
• with the proviso that the compound does not comprise an adamantyl group.

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:
• wherein moiety X represents a fused multicyclic ring system comprising two or more 5-membered or 6-membered carbocyclic or heterocyclic rings;
• wherein rings A and B are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring;
• wherein Z1, Z2, and Z3 are each independently C or N;
• wherein K3 and K4 are each independently selected from the group consisting of a direct bond, O, and S;
• wherein each RA, RB, and RX represents mono to the maximum allowable substitution, or no substitution;
• wherein each RA, RB, and RX is independently a hydrogen or a substituent selected from the group consisting of deuterium, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, partially or fully fluorinated variants thereof, and combinations thereof;
• wherein at least one of the following conditions is true:
• (1) ring B is partially or fully deuterated, and
• (2) at least one RB is an aryl or heteroaryl group that is partially or fully deuterated;
• wherein LA is coordinated to a metal M through the indicated dashed lines to form a 5-membered or 6-membered chelate ring;
• wherein M may be coordinated to other ligands;
• wherein LA may be joined with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand;
• wherein any two substituents may be joined or fused to form a ring;
• and
• with the proviso that the compound does not comprise an adamantyl group.