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 of Formula I,
• wherein Moiety B is a monocyclic ring comprising one 5-membered to 10-membered carbocyclic or heterocyclic ring, or a multicyclic fused ring system comprising at least two fused 5-membered to 10-membered carbocyclic or heterocyclic rings;
• X1 to X5 are each independently C or N;
• at least one of X1 to X4 is N;
• RA and RB are mono to the maximum allowable substitution or no substitution;
• each RA and RB is independently hydrogen or a substituent selected from the groups 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, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;
• R1 is a substituent selected from the group consisting of carbazole, azacarbazole, 5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, aza-5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, silyl, and germyl, any of which may be further substituted;
• R2 is a substituent selected from the group consisting of carbazole, azacarbazole, 5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, and aza-5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, any of which may be further substituted;
• and
• any two substituents may be joined or fused to form a ring,
• wherein the compound is not

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 of Formula I,
• wherein Moiety B is a monocyclic ring comprising one 5-membered to 10-membered carbocyclic or heterocyclic ring, or a multicyclic fused ring system comprising at least two fused 5-membered to 10-membered carbocyclic or heterocyclic rings;
• X1 to X5 are each independently C or N;
• at least one of X1 to X4 is N;
• RA and RB are mono to the maximum allowable substitution or no substitution;
• each RA and RB is independently hydrogen or a substituent selected from the groups 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, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, selenyl, and combinations thereof;
• R1 is a substituent selected from the group consisting of carbazole, azacarbazole, λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, aza-5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, silyl, and germyl, any of which may be further substituted;
• R2 is a substituent selected from the group consisting of carbazole, azacarbazole, 5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, and aza-5λ2-benzo[d]benzo[4,5]imidazo[3,2-a]imidazole, any of
• which may be further substituted;
• and
• any two substituents may be joined or fused to form a ring,
• wherein the compound is not