Plurality of host materials and organic electroluminescent device comprising the same

A plurality of host materials comprising at least one of a first host compound and at least one of a 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:

• HAr-(L1-Ar1)a (1)
• wherein,
• HAr represents a substituted or unsubstituted nitrogen-containing (3- to 10-membered)heteroaryl;
• L1 represents a single bond or a substituted or unsubstituted (C6-C30)arylene;
• Ar1 represents a substituted or unsubstituted (C6-C30)aryl;
• a represents an integer of 1 to 3;
• and
• when a is 2 or more, each of (L1-Ar1) may be the same or different;
• wherein,
• L2 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 hydrogen, deuterium, halogen, 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, —NR16R17, or —SiR18R19R20;
• or may be linked to adjacent substituents to form a ring;
• 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
• is represented by the following formula 2-1 or 2-2;
• wherein,
• X1 to X25 each independently represent N or CRa;
• and
• Ra each independently represents hydrogen, deuterium, halogen, 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 adjacent substituents to form a ring.