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, comprising a compound comprising a first ligand LX of Formula II
• wherein F is a 5-membered or 6-membered carbocyclic or heterocyclic ring;
• wherein RF and RG independently represent mono to the maximum possible number of substitutions, or no substitution;
• wherein Z3 and Z4 are each independently C or N and coordinated to a metal M to form a 5-membered chelate ring;
• wherein G is a fused ring structure comprising five or more fused heterocyclic or carbocyclic rings, of which at least one ring is of Formula III
• wherein the fused heterocyclic or carbocyclic rings comprised by Ring G are 5-membered or 6-membered;
• of which if two or more 5-membered rings are present, at least two of the 5-membered rings are fused to one another;
• wherein Y is selected from the group consisting of BR′, NR′, PR′, O, S, Se, C═O, S═O, SO2, CR′R″, SiR′R″, and GeR′R″;
• wherein each R′, R″, RF , and RG is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• wherein metal M is optionally coordinated to other ligands;
• and
• wherein the ligand LX is optionally linked with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand..

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, comprising a compound comprising a first ligand LX of Formula II
• wherein F is a 5-membered or 6-membered carbocyclic or heterocyclic ring;
• wherein RF and RG independently represent mono to the maximum possible number of substitutions, or no substitution;
• wherein Z3 and Z4 are each independently C or N and coordinated to a metal M to form a 5-membered chelate ring;
• wherein G is a fused ring structure comprising five or more fused heterocyclic or carbocyclic rings, of which at least one ring is of Formula III
• wherein the fused heterocyclic or carbocyclic rings comprised by Ring G are 5-membered or 6-membered;
• of which if two or more 5-membered rings are present, at least two of the 5-membered rings are fused to one another;
• wherein Y is selected from the group consisting of BR′, NR′, PR′, O, S, Se, C═O, S═O, SO2, CR′R″, SiR′R″, and GeR′R″;
• wherein each R′, R″, RF , and RG is independently hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• wherein metal M is optionally coordinated to other ligands;
• and
• wherein the ligand LX is optionally linked with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand.