PLURALITY OF HOST MATERIALS AND ORGANIC ELECTROLUMINESCENT DEVICE COMPRISING THE SAME

1 . 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:

wherein

L 1 and L 2 each independently represent, a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3- to 30-membered)heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;

HAr represents a substituted or unsubstituted (3- to 30-membered)heteroaryl;

Ar represents a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

R 1 to R 3 each independently represent, 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, —NR 13 R 14 , or —SiR 15 R 16 R 17 ; or may be linked to the adjacent substituents to form a ring(s);

R 13 to R 17 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;

a and c each independently represent, an integer of 1 to 4; and b represents an integer of 1 or 2;

when a to c are an integer of 2 or more, each of R 1 , each of R 2 , and each of R 3 may be the same or different;

wherein

A 1 and A 2 each independently represent, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted dibenzofuranyl, a substituted or unsubstituted dibenzothiophenyl, or a substituted or unsubstituted carbazolyl; and

X 11 to X 26 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

provided that at least one of X 11 , X 18 , X 19 , and X 26 is deuterium.

2 . The plurality of host materials according to claim 1 , wherein the formula 1 is represented by any one of the following formulas 1-1 to 1-6:

wherein

HAr, Ar, L 1 , L 2 , R 1 to R 3 , and a to c are as defined in claim 1 .

3 . The plurality of host materials according to claim 1 , wherein the formula 2 is represented by any one of the following formula 2-1 to 2-8,

wherein

A 1 , A 2 , and X 11 to X 26 are as defined in claim 1 .

4 . The plurality of host materials according to claim 1 , wherein substituents in the substituted alkyl(ene), substituted aryl(ene), substituted heteroaryl(ene), substituted cycloalkyl(ene), substituted cycloalkenyl, and substituted heterocycloalkyl each independently represent at least one selected from the group consisting of deuterium; halogen; cyano; carboxyl; nitro; hydroxyl; (C1-C30)alkyl; halo(C1-C30)alkyl; (C2-C30)alkenyl; (C2-C30)alkynyl; (C1-C30)alkoxy; (C1-C30)alkylthio; (C3-C30)cycloalkyl; (C3-C30)cycloalkenyl; (3- to 7-membered)heterocycloalkyl; (C6-C30)aryloxy; (C6-C30)arylthio; (3- to 30-membered)heteroaryl unsubstituted or substituted with (C6-C30)aryl; (C6-C30)aryl unsubstituted or substituted with at least one of (C1-C30)alkyl and (3- to 30-membered)heteroaryl; tri(C1-C30)alkylsilyl; tri(C6-C30)arylsilyl; di(C1-C30)alkyl(C6-C30)arylsilyl; (C1-C30)alkyldi(C6-C30)arylsilyl; amino; mono- or di-(C1-C30)alkylamino; mono- or di-(C6-C30)arylamino; (C1-C30)alkyl(C6-C30)arylamino; (C1-C30)alkylcarbonyl; (C1-C30)alkoxycarbonyl; (C6-C30)arylcarbonyl; di(C6-C30)arylboronyl; di(C1-C30)alkylboronyl; (C1-C30)alkyl(C6-C30)arylboronyl; (C6-C30)ar(C1-C30)alkyl; and (C1-C30)alkyl(C6-C30)aryl.

5 . The plurality of host materials according to claim 1 , wherein the compound represented by formula 1 is at least one selected from the following compounds:

wherein

Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 to 50.

6 . The plurality of host materials according to claim 1 , wherein the compound represented by formula 2 is selected from the following compounds:

wherein

Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 to 50.

7 . An organic electroluminescent device comprising: a first electrode; a second electrode; and at least one light-emitting layer(s) between the first electrode and the second electrode, wherein the at least one light-emitting layer(s) comprises the plurality of host materials according to claim 1 .

8 . An organic electroluminescent compound represented by the following formula 1-1′:

wherein

L 1 represents a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted pyridylene, a substituted or unsubstituted dibenzofuranylene, or a substituted or unsubstituted dibenzothiophenylene;

L 2 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;

HAr represents a substituted or unsubstituted triazinyl;

Ar represents a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

R′ 1 to R′ 8 and R 2 each independently represent, 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, —NR 13 R 14 , or —SiR 15 R 16 R 17 ; or may be linked to the adjacent substituents to form a ring(s); provided that at least one of R′ 1 to R′ 8 and R 2 is deuterium;

R 13 to R 17 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

b is an integer of 1 or 2;

when b is 2, each of R 2 may be the same or different.

9 . The organic electroluminescent compound according to claim 8 , wherein the compound represented by formula 1-1′ is represented by any one of the following formula 1-1′-1 to 1-1′-6:

wherein

L 1 , L 2 , Ar, and R′ 1 to R′ 8 are as defined in claim 8 ;

R′ 9 to R′ 12 are as defined as R 2 in claim 8 ; and

Y 1 and Y 2 each independently represent, a substituted or unsubstituted (C6-C30)aryl or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

provided that at least one of R′ 1 , R′ 8 , and R′ 9 to R′ 12 is deuterium.

10 . The organic electroluminescent compound according to claim 8 , wherein the organic electroluminescent compound represented by formula 1-1′ is selected from the following compounds:

wherein

Dn means that n number of hydrogens is replaced with deuterium, wherein n represents an integer of 1 to 50.