Helically chiral platinum(ii) and palladium(ii) complex circularly polarized luminescent materials and their applications

A helically chiral platinum(II) or palladium(II) complex-based circularly polarized luminescent material, wherein its chemical formula is represented by general formulas (I) and (I′), where (I) and (I′) are enantiomers of each other:

• where M is Pt or Pd;
• V1, V2, and V3 are each independent N or C;
• Y1, Y2, and Y3 are each independent as N or C;
• L1, L2, L3, and L4 are each independent as five membered or six membered carbon ring, heterocycle, aromatic ring, or heteroaromatic ring;
• L5 is a six to ten membered carbon ring or heterocycle containing central chirality, where “*” represents a carbon atom with central chirality, that is, Ra and Rb are different substituents in the same molecule;
• A is O, S, CRxRy, C═O, SiRxRy, GeRxRy, NRz, PRzRzP═O, AsRz, RzAs═O, S═O, SO2, Se, Se═O, SeO2, BH, BRz, RzBi═O or BiRz;
• X1 and X2 can exist or not exist, and if they exist, X1 and X2 are each independently single bond, O, S, CRxRy, C═O, SiRxRy, GeRxRy, NRz, PRz, RzP═O, AsRz, RzAs═O, S═O, SO2, Se, Se═O, SeO2, BH, BRz, RzBi═O or BiRz;
• Z is N, CRx, SiRx, GeRx, B, P, P═O, As, As═O, Bi═O or Bi;
• R1, R2, R3, R4, R5 and R6 each independently representing single, double, three, four, five, or six substituted or unsubstituted, and meanwhile, R1, R2, R3, R4, R5, R6, Ra, Rb, Rx, Ry and Rz are each independently hydrogen, deuterium, halogen, alkyl, cycloalkyl, aryl, heterocycloalkyl, heteroaryl, haloalkyl, haloaryl, haloheteroaryl, alkoxy, aryloxy, alksiliyl, arylsiliyl, heteroarylsiliyl, alkyl (hetero) arylsiliyl, alkenyl, cycloalkenyl, alkynyl, hydroxyl, mercapto, nitro, cyano, amino, mono- or dialkylamino, mono- or diarylamino, ester, isonitrile, alkoxycarbonyl, amido, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphonamido, imino, sulfo, carboxyl, hydrazino, or combinations thereof, two or more adjacent R1, R2, R3, R4, R5 and R6 can selectively connect to form a fused ring;
• any two groups in Ra, Rb, and R6 can be connected to form a cyclic system.