Organic electroluminescent materials and devices

An organic electroluminescent 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 structure of Formula II
• wherein:
• each of XA1 to XA4 is independently C or N;
• the B—C bond is a carbene-boron bond;
• RAa represents mono to the maximum allowable substitution, or no substitution;
• each RAa, R′a, R″a, R1a, R2a, and R3a is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, germyl, selenyl, 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;
• if one of R′a and R″a is fused to R1a, then R′a and R″a each comprise at least two carbon atoms;
• any two adjacent RAa, R′a, R″a, R1a, R2a, and R3a can be joined or fused to form a ring;
• at least one of R′a and R1a, or R″a and R3a are joined or fused to form a ring;
• at least one of the following three conditions is true:
• (1) an RAa substituent and R″a are joined to form a ring;
• (2) R2a and R3a are both unsubstituted aryl groups;
• (3) at least one of R2a and R3a is not aryl.

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:
• each of XA1 to XA4 is independently C or N;
• the B—C bond is a carbene-boron bond;
• RAa represents mono to the maximum allowable substitution, or no substitution;
• each RAa, R′a, R″a, R1a, R2a, and R3a is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl, germyl, selenyl, 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;
• if one of R′a and R″a is fused to R1a, then R′a and R″a each comprise at least two carbon atoms;
• any two adjacent RAa, R′a, R″a, R1a, R2a, and R3a can be joined or fused to form a ring;
• at least one of R′a and R1a, or R″a and R3a are joined or fused to form a ring;
• at least one of the following three conditions is true:
• (1) an RAa substituent and R″a are joined to form a ring;
• (2) R2a and R3a are both unsubstituted aryl groups;
• (3) at least one of R2a and R3a is not aryl.