Metal-assisted delayed fluorescent emitters containing tridentate ligands

A compound represented by Formula B-I

• wherein:
• M is Ir or Rh,
• each of L1 and L4 is independently a five-membered heterocyclyl with one, two, or three nitrogen atoms,
• each of L2 and L5 is independently substituted or unsubstituted phenyl,
• each of L3 and L6 is independently substituted or unsubstituted pyridine,
• 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,
• A1 and A2 are each independently NH, NR3, or O, 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, V3, V4, and V6 is independently N or C,
• each of V2 and V5 is C,
• each of Y1, Y2, Y3, Y4, Y5, Y6, Y7, and Y8 is independently C, N, O, or S,
• 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
• R3 is 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.