Plurality of host materials, organic electroluminescent compound and organic electroluminescent device comprising the same

A plurality of host materials comprising a first host material comprising the compound represented by formula 1, and a second host material comprising the compound represented by formula 2:

• in formula 1,
• L represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C3-C30)cycloalkylene, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3-to 30-membered)heteroarylene;
• Ar represents deuterium, a halogen, a cyano, 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, a substituted or unsubstituted (3-to 30-membered) heteroaryl, —NR11R12, or —SiR13R14R15;
• R11 to R15, each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3-to 30-membered)heteroaryl;
• and
• is represented by the following formula 1-1 or 1-2:
• in formulas 1-1 and 1-2,
• X1 to X25, each independently, represent —N═ or —C(Ra)═;
• Ra, 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-(C2-C30) alkenylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, a substituted or unsubstituted mono- or di-(3-to 30-membered)heteroarylamino, a substituted or unsubstituted (C1-C30)alkyl(C2-C30) alkenylamino, a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino, a substituted or unsubstituted (C1-C30)alkyl (3-to 30-membered)heteroarylamino, a substituted or unsubstituted (C2-C30) alkenyl (C6-C30)arylamino, a substituted or unsubstituted (C2-C30) alkenyl (3-to 30-membered)heteroarylamino, or a substituted or unsubstituted (C6-C30)aryl (3-to 30-membered)heteroarylamino, or the adjacent Ra's may be linked to each other to form a ring(s), and where if there is a plurality of Ra, each of Ra may be the same or different from each other;
• with the provisos that:
• Ra in X5 is not linked to the adjacent Ra in X6 to form a ring(s);
• Ra in X9 is not linked to the adjacent Ra in X10 to form a ring(s);
• Ra in X18 is not linked to the adjacent Ra in X19 to form a ring(s);
• and
• Ra in X22 is not linked to the adjacent Ra in X23 to form a ring(s);
• and
• in formula 2,
• X′ represents O, S, or CR5R6;
• R1 to R4, 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 (C3-C30)cycloalkenyl, a substituted or unsubstituted (3-to 7-membered)heterocycloalkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3-to 30-membered)heteroaryl, -L3-NR16R17, or —SiR18R19R20;
• or may be linked to adjacent substituent(s) to form a ring(s);
• wherein, at least one of R1 to R4 represents a cyano, 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, a substituted or unsubstituted (3-to 30-membered)heteroaryl, -L3-NR16R17, or —SiR18R19R20;
• L3 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3-to 30-membered)heteroarylene;
• R5 and R6, each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3-to 30-membered)heteroaryl, or R5 and R6 may be linked to each other to form a ring(s);
• R16 to R20, each independently, represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3-to 30-membered)heteroaryl;
• and
• a′ and d′, each independently, represent an integer of 1 to 4, b′ and c′, each independently, represent an integer of 1 or 2, and where if each of a′ to d′ is an integer of 2 or more, each of R1 to each of R4 may be the same or different from each other.