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

A plurality of host materials comprising at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following formula 1, and the second host compound is represented by the following formula 2:

• in formula 1,
• X1 to X3 each independently represent CR′ or N;
• R′ each independently represents 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 fused ring group of a (C3-C30) aliphatic ring and a (C6-C30) aromatic ring, or -L1-N—(Ar4)(Ar5);
• Ar1 to Ar3 each independently represent hydrogen, 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 fused ring group of a (C3-C30) aliphatic ring and a (C6-C30) aromatic ring, or -L1-N—(Ar4)(Ar5);
• R1 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 fused ring group of a (C3-C30) aliphatic ring and a (C6-C30) aromatic ring, or -L1-N—(Ar4)(Ar5), or a substituent represented by the following formula 1-1, or the adjacent two of R1 to R8 may be fused to form a ring represented by the following formula 1-2, with a proviso that formula 1 comprises at least one structure selected from formulas 1-1 and 1-2, and when R2 or R7 is formula 1-1, the carbazole parent structure is not bonded at carbon positions of 1 and 2 of formula 1-1;
• W and Y each independently represent O or S;
• R9 to R11 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 fused ring group of a (C3-C30) aliphatic ring and a (C6-C30) aromatic ring, or -L1-N—(Ar4)(Ar5);
• a to c are each independently an integer of 1 to 5, d is an integer of 1 to 3, and e and f are each independently an integer of 1 to 4, where if a to f are each an integer of 2 or more, each of Ar1 to Ar3 and each of R9 to R11 may be the same or different;
• and
• * represents a bonding position with the carbazole parent structure:
• in formula 2,
• La represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• Ara represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
• R12 and R13 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 50-membered)heteroaryl, 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 and a (C6-C30) aromatic ring, or -L1-N—(Ar4)(Ar5);
• or may be linked to an adjacent substituent to form a ring(s);
• g and h are each independently an integer of 1 to 4;
• and
• if g and h are each an integer of 2 or more, each of R12 and each of R13 may be the same or different;
• in formulas 1 and 2,
• L1 each independently represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• and
• Ar4 and Ar5 each independently represent hydrogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted fused ring group of a (C3-C30) aliphatic ring and a (C6-C30) aromatic ring, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl.