A dibenzo[1,4]azaborine comprising compound, and devices and formulations including the same are described. The compound includes a ligand L1 including wherein E1 is N; E2 is B; and R3 and R4 represent mono, di, tri, tetra substitutions or no substitution; wherein R1, R2, R3 and R4 are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein any two adjacent R1, R2, R3, and R4 are optionally joined to form a ring, which may be further substituted; wherein L1 is coordinated to a metal M, provided that the metal M does not form bond with E1 and E2; and wherein L1 may be linked with other ligands to comprise a bidentate, tridentate, tetradentate, pentadentate or hexadentate ligand.