Organic electroluminescent device comprising a compound of formula (i) and a compound of formula (ii), and display device comprising the organic electroluminescent device

An organic electroluminescent device comprising an anode layer, a cathode layer, an organic semiconductor layer, at least two light-emitting units, and at least one charge generation layer, wherein at least one charge generation layer comprises a p-type charge generation layer;

• wherein each light-emitting unit comprises at least one light-emitting layer,
• wherein each of the at least one charge generation layer is disposed independently between a set of two adjacent light-emitting units of the at least two light-emitting units;
• wherein the organic semiconductor layer is closer to the anode layer than the p-type charge generation layer;
• wherein the organic semiconductor layer comprises a compound of formula (I)
• wherein in formula (I)
• R1 and R2 are independently selected from substituted or unsubstituted C6 to C30 aryl and substituted or unsubstituted C3 to C30 heteroaryl;
• wherein the one or more of the substituents on R1 and R2 are independently selected from D, electron-withdrawing group, CN, isocyano, SCN, OCN, CF3, NO2, SF5, halogen, F, substituted or unsubstituted C1 to C6 alkyl, partially fluorinated C1 to C6 alkyl, perfluorinated C1 to C6 alkyl, substituted or unsubstituted C1 to C6 alkoxy, substituted or unsubstituted C6 to C30 aryl, substituted or unsubstituted C2 to C30 heteroaryl, substituted or unsubstituted C1 to C6 alkylsulfinyl, substituted or unsubstituted C6 to C30 arylsulfinly, substituted or unsubstituted C2 to C30 heteroarylsulfinyl, substituted or unsubstituted C1 to C6 alkylsulfonyl, substituted or unsubstituted C6 to C30 arylsulfonyl, and substituted or unsubstituted C2 to C30 heteroarylsulfonyl;
• wherein the one or more substituents thereon are selected from D, electron-withdrawing group, CN, isocyano, SCN, OCN, halogen, F, partially fluorinated C1 to C6 alkyl, perfluorinated C1 to C6 alkyl, CF3, NO2, SF5, partially fluorinated C1 to C6 alkoxy and perfluorinated C1 to C6 alkoxy;
• Z1 and Z2 are independently selected from O, S, Se, S═O, or SO2,
• X and Y are independently selected from CR3R4 or NR5;
• wherein R3 and R4 are independently selected from CN, isocyano, SCN, OCN, halogen, F, CF3, NO2, SF5, substituted or unsubstituted C1 to C6 alkyl, partially fluorinated C1 to C6 alkyl, perfluorinated C1 to C6 alkyl, substituted or unsubstituted C1 to C6 alkoxy, substituted or unsubstituted C1 to C6 alkylsulfinyl, substituted or unsubstituted C6 to C30 arylsulfinly, substituted or unsubstituted C2 to C30 heteroarylsulfinyl, substituted or unsubstituted C1 to C6 alkylsulfonyl, substituted or unsubstituted C6 to C30 arylsulfonyl, substituted or unsubstituted C2 to C30 heteroarylsulfonyl, substituted or unsubstituted C6 to C30 aryl, and substituted or unsubstituted C2 to C30 heteroaryl;
• wherein the one or more substituents on R3 and R4 are independently selected from D, CN, isocyano, SCN, OCN partially fluorinated C1 to C6 alkyl, perfluorinated C1 to C6 alkyl, CF3, NO2, and SF5;
• wherein R5 is independently selected from CN, partially fluorinated C1 to C6 alkyl, perfluorinated C1 to C6 alkyl, CF3, substituted or unsubstituted C6 to C30 aryl, and substituted or unsubstituted C2 to C30 heteroaryl;
• and
• wherein the one or more substituents on R5 are independently selected from D, halogen, F, CN, partially fluorinated C1 to C6 alkyl, perfluorinated C1 to C6 alkyl, NO2, and SF5;
• wherein the p-type charge generation layer comprises an organic hole transport material and a compound of formula (II)
• wherein in formula (II)
• A1 is independently selected from a group of formula (IIa)
• wherein Ar1 is independently selected from substituted or unsubstituted C6 to C36 aryl, and substituted or unsubstituted C2 to C36 heteroaryl;
• wherein for the case that Ar1 is substituted, one or more of the substituents are independently selected from the group consisting of an electron-withdrawing group, halogen, Cl, F, CN, partially fluorinated alkyl, perfluorinated alkyl, partially fluorinated and perfluorinated C1 to C6 alkoxy, and —NO2;
• A2 is independently selected from a group of formula (IIb)
• wherein Ar2 is independently selected from substituted or unsubstituted C6 to C36 aryl, and substituted or unsubstituted C2 to C36 heteroaryl;
• wherein for the case that Ar2 is substituted, one or more of the substituents are independently selected from the group consisting of an electron-withdrawing group, halogen, Cl, F, CN, partially fluorinated alkyl, perfluorinated alkyl, partially fluorinated and perfluorinated C1 to C6 alkoxy and —NO2;
• A3 is independently selected from a group of formula (IIc)
• wherein Ar3 is independently selected from substituted or unsubstituted C6 to C36 aryl, and substituted or unsubstituted C2 to C36 heteroaryl;
• wherein for the case that Ar3 is substituted, one or more of the substituents are independently selected from the group consisting of an electron-withdrawing group, halogen, Cl, F, CN, partially fluorinated alkyl, perfluorinated alkyl, partially fluorinated and perfluorinated C1 to C6 alkoxy and —NO2;
• and wherein in A1, A2, and A3 each R′ is independently selected from substituted or unsubstituted C6 to C18 aryl, C3 to C18 heteroaryl, electron-withdrawing group, partially fluorinated C1 to C8 alkyl, perfluorinated C1 to C8 alkyl, halogen, F and CN.