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

A plurality of host materials comprising two different host materials selected from the group consisting of a compound represented by the following Formula 1 and a compound represented by the following Formula 2 as a first host material and a second host material, respectively, and further comprising a third host material different from the first host material and second host material:

• In Formula 1,
• X1 represents —N═, —NR7—, —O—, or —S—;
• Y1 represents —N═, —NR8—, —O—, or —S—, with a proviso that if X1 is —N═, Y1 is —NR8—, —O—, or —S—, and if X1 is —NR7—, Y1 is —N═, —O—, or —S—;
• X represents N or CH;
• R1 represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
• R2 to R8 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 (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 mono- or di(C1-C30)alkylamino, a substituted or unsubstituted mono- or di(C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino;
• or may be linked to an adjacent substituent(s) to form a ring(s);
• L1 to L3 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• a represents an integer of 1;
• b and c each independently represent an integer of 1 or 2;
• and d represents an integer of 1 to 4;
• and
• the heteroaryl(ene) comprises at least one heteroatom selected from B, N, O, S, Si, P, and Se;
• In Formula 2,
• X represents O or S;
• L4 to L6 each independently represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• P1 and P2 each independently represent hydrogen, deuterium, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, 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, or a substituted or unsubstituted tri(C6-C30)arylsilyl;
• or may be linked to an adjacent substituent(s) to form a ring(s);
• P3 and P4 each independently represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C3-C30)cycloalkenyl, a substituted or unsubstituted (3- to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
• and
• e represents an integer of 1 to 4;
• f represents an integer of 1 to 3;
• and if e and f are integers of 2 or more, each of P1 and each of P2 may be the same as or different from each other.