Plurality of host materials and organic electroluminescent device comprising the same

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

• wherein,
• Ar represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl containing at least one of N, O, and S, or —NX9X10;
• L1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• X1 to X8 each independently represent hydrogen, deuterium, halogen, cyano, carboxyl, nitro, hydroxy, 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, —NX11X12, or —SiX13X14X15;
• or two or more adjacent substituents among X1 to X8 may be linked to each other to form a ring;
• provided that, at least one of X1 and X2, X2 and X3, X3 and X4, X4 and X5, X5 and X6, X6 and X7, and X7 and X8 are linked to each other to form a substituted or unsubstituted monocyclic ring or polycyclic ring having 2 to 5 rings;
• X9 and X10 each independently represent a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
• and
• X11 to X15 each independently represent hydrogen, deuterium, halogen, cyano, carboxyl, nitro, hydroxy, 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;
• or may be linked to adjacent substituents to form a ring;
• wherein,
• X represents —O— or —S—;
• HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl containing at least one nitrogen atom;
• L2 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• R1 and R2 each independently represent 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;
• and
• a represents an integer of 1 to 4, b represents an integer of 1 to 3, when a and b are 2 or more, each of R1 and each of R2 may be the same or different.