Organic electroluminescent compound, a plurality of host materials, and organic electroluminescent device comprising the same

A plurality of host materials comprising a first host material comprising a compound represented by the following Formula 1 and a second host material comprising a compound represented by the following Formula 2, wherein at least one of the first host material and the second host material comprises a cyano:

• wherein in Formula 1,
• Ar represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
• L represents a single bond, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
• a represents an integer of 1 to 3, where if a is an integer of 2 or 3, each L may be the same as or different from each other;
• HAr is represented by the following Formula 1-a or 1-b:
• wherein in Formulas 1-a and 1-b,
• * represents a site linked to L, and in Formula 1-b, any one of R1 to R5 is linked to L;
• X1 to X3 each independently represent N or CR9;
• with the proviso that at least one of X1 to X3 is N;
• Ar1 and Ar2 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, or a substituted or unsubstituted fused ring group of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s);
• R6 to R9 and those of R1 to R5 that are not linked to L each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, or a substituted or unsubstituted fused ring group of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s);
• and
• L1 and L2 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
• with the proviso that when HAr is represented by Formula 1-a, cases where Ar, Ar1, or Ar2 comprises a tri(C6-C30)arylsilyl or a tri(C6-C30)arylmethyl are excluded, and the carbon atoms of the aryl in the tri(C6-C30)arylsilyl and the tri(C6-C30)arylmethyl may be replaced with any one of N, S, or O;
• wherein in Formula 2,
• ring A is represented by the following Formula 2-a or 2-b;
• R10 to R15 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted fused ring group of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s), or
• or may be linked to an adjacent substituent(s) to form a ring(s);
• L3 to L5 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
• Ar4 and Ar5 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
• wherein in Formulas 2-a and 2-b,
• Y1 and Y2 each independently represent —N═, —NRa—, —O—, or —S—, with the proviso that one of Y1 and Y2 is —N═, and the other of Y1 and Y2 is —NRa—, —O—, or —S—;
• T represents O or S;
• and
• an adjacent pair among R171 to R174, R181 to R184, and R191 to R194 represents a fused position to the naphthalene in Formula 2, and R171 to R174, R181 to R184, R191 to R194, Ra, and R16 which are not fused positions each independently have the same definitions as R10 to R15;
• with the proviso that when the ring A is represented by Formula 2-a, any one of R10 to R16 and R171 to R174 is
• and when the ring A is represented by Formula 2-b, at least one of R10 to R15, R181 to R184, and R191 to R194 is
• and
• with the proviso that when Ar4 and Ar5 are substituted (C6-C30)aryl, cases where the substituents of the substituted aryl comprise a carbazole or an amino are excluded.