Metal-assisted delayed fluorescent emitters containing tridentate ligands

A compound represented by Formula B

• wherein:
• M is Ir or Rh,
• each of X1 and X2 is independently present or absent;
• wherein when X1 is present, then X1 represents a carbon atom and L1 is a six-membered aryl or a six-membered heteroaryl;
• wherein when X2 is present, then X2 represents a carbon atom and L4 is a six-membered aryl or a six-membered heteroaryl;
• wherein when X1 is absent, then L2 binds to Y4;
• Y4 binds to V1;
• and L1 is a five-membered heterocyclyl, five-membered heteroaryl, five-membered carbene, or five-membered N-heterocyclic carbene;
• wherein when X2 is absent, then L5 binds to Y8;
• Y8 binds to V4;
• and L4 is a five-membered heterocyclyl, five-membered heteroaryl, five-membered carbene, or five-membered N-heterocyclic carbene;
• each of L2, L3, L5, and L6 is independently substituted or unsubstituted aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocyclyl, carbene, or N-heterocyclic carbene,
• each of LP1, LP2, LP3, LP4, LP5, and LP6 is independently a fluorescent luminophore, each of LP1, LP2, LP3, LP4, LP5, and LP6 is independently present or absent, and at least one of LP1, LP2, LP3, LP4, LP5, and LP6 is present,
• each of A1 and A2 is independently CH2, CR1R2, C═O, CH2, SiR1R2, GeH2, GeR1R2, NH, NR3, PH, PR3, R3P═O, AsR3, R3As═O, O, S, S═O, SO2, Se, Se═O, SeO2, BH, BR3, R3Bi═O, BiH, or BiR3, and A1 optionally forms more than one bond with L2, L3, or both, thereby forming a ring system with L2, a ring system with L3, or both, and A2 optionally forms more than one bond with L5, L6, or both, thereby forming a ring system with L5, a ring system with L6, or both,
• each of V1, V2, V3, V4, V5, and V6 is independently N, C, P, B, or Si,
• each of Y1, Y2, Y3, Y4, Y5, Y6, Y7, and Y8 is independently C, N, O, S, S═O, SO2, Se, Se═O, SeO2, PR3, R3P═O, AsR3, R3As═O, or BR3,
• each of Ra, Rb, Rc, Rd, Re, and Rf is independently present or absent, and if present each of Ra, Rb, Rc, Rd, Re, and Rf is independently a mono-, di-, tri- or tetra substitution, and each Ra, Rb, Rc, Rd, Re, and Rf is independently hydrogen, deuterium, halogen, hydroxyl, thiol, nitro, cyano, nitrile, isonitrile, sulfinyl, mercapto, sulfo, carboxyl, hydrazino;
• substituted or unsubstituted:
• aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, amino, monoalkylamino, dialkylamino, monoarylamino, diarylamino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, ureido, phosphoramide, silyl, polymeric;
• or any conjugate or combination thereof, and
• each of R1, R2, and R3 is independently hydrogen, deuterium, halogen, hydroxyl, thiol, nitro, cyano, nitrile, isonitrile, sulfinyl, mercapto, sulfo, carboxyl, hydrazino;
• substituted or unsubstituted:
• aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, amino, monoalkylamino, dialkylamino, monoarylamino, diarylamino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, ureido, phosphoramide, silyl, polymeric;
• or any conjugate or combination thereof.