Organic electroluminescent compound, a 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:

in formula 1,

R 1 to R 8 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(s) and a (C6-C30)aromatic ring(s), or -(L) a -HAr;

at least one of R 1 to R 8 is -(L) a -HAr;

HAr represents a substituted or unsubstituted nitrogen-containing (3- to 20-membered)heteroaryl;

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

a represents 1 or 2;

in formula 2,

L 1 to L 3 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;

Ar 1 to Ar 3 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 an unsubstituted fused ring group of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s), or -L b -N(Ar c )(Ar d );

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

Ar c and Ar d 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(s) and a (C6-C30)aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

with the proviso that the case where all of L 1 to L 3 are single bonds and all of Ar1 to Ar3 are hydrogen is excluded.

2 . The plurality of host materials according to claim 1 , wherein the substituents of the substituted alkyl(ene), the substituted alkenyl, the substituted aryl(ene), the substituted heteroaryl(ene), the substituted cycloalkyl(ene), the substituted alkoxy, the substituted trialkylsilyl, the substituted dialkylarylsilyl, the substituted alkyldiarylsilyl, the substituted triarylsilyl, and the substituted fused ring group of an aliphatic ring(s) and an aromatic ring(s) each independently are at least one selected from the group consisting of deuterium; a halogen; a cyano; a carboxyl; a nitro; a hydroxyl; a phosphine oxide; a (C1-C30)alkyl; a halo(C1-C30)alkyl; a (C2-C30)alkenyl; a (C2-C30)alkynyl; a (C1-C30)alkoxy; a (C1-C30)alkylthio; a (C3-C30)cycloalkyl; a (C3-C30)cycloalkenyl; a (3- to 7-membered)heterocycloalkyl; a (C6-C30)aryloxy; a (C6-C30)arylthio; a (3- to 30-membered)heteroaryl unsubstituted or substituted with at least one of deuterium and a (C6-C30)aryl(s); a (C6-C30)aryl unsubstituted or substituted with at least one of deuterium and a (3- to 30-membered)heteroaryl(s); tri(C1-C30)alkylsilyl; a tri(C6-C30)arylsilyl; a di(C1-C30)alkyl(C6-C30)arylsilyl; a (C1-C30)alkyldi(C6-C30)arylsilyl; a fused ring group of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s); an amino; a mono- or di-(C1-C30)alkylamino; a mono- or di-(C2-C30)alkenylamino; a mono- or di-(C6-C30)arylamino; a mono- or di-(3- to 30-membered)heteroarylamino; a (C1-C30)alkyl(C2-C30)alkenylamino; a (C1-C30)alkyl(C6-C30)arylamino; a (C1-C30)alkyl(3- to 30-membered)heteroarylamino; a (C2-C30)alkenyl(C6-C30)arylamino; a (C2-C30)alkenyl(3- to 30-membered)heteroarylamino; a (C6-C30)aryl(3- to 30-membered)heteroarylamino; a (C1-C30)alkylcarbonyl; a (C1-C30)alkoxycarbonyl; a (C6-C30)arylcarbonyl; a (C6-C30)arylphosphine; a di(C6-C30)arylboronyl; a di(C1-C30)alkylboronyl; a (C1-C30)alkyl(C6-C30)arylboronyl; a (C6-C30)aryl(C1-C30)alkyl; and a (C1-C30)alkyl(C6-C30)aryl.

3 . 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 1-4:

in formulas 1-1 to 1-4,

R 1 to R 8 , L, HAr, and a are as defined in claim 1 .

4 . The plurality of host materials according to claim 1 , wherein the formula 2 is represented by any one of the following formulas 2-1 to 2-14:

in formulas 2-1 to 2-14,

Y 1 , Y 2 , Z 1 , and Z 2 each independently represent —N═, —NR 21 —, —O—, or —S—, with the proviso that any one of Y 1 and Z 1 represents —N═, and the other one of Y 1 and Z 1 represents —NR 21 —, —O—, or —S—, and with the proviso that any one of Y 2 and Z 2 represents —N═, and the other one of Y 2 and Z 2 represents —NR 21 —, —O—, or —S—;

T represents CR 22 R 23 , NR 24 , O, or S;

T 1 to T 13 and W 1 to W 12 each independently represent N or CV 1 ;

R 11 and Ar 6 each independently represent a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

R 12 to R 19 , R 21 to R 28 , and V 1 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(s) and a (C6-C30)aromatic ring(s), or -L c -N(Ar e )(Ar f ); or may be linked to an adjacent substituent to form a substituted or unsubstituted ring(s);

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

Ar e and Ar f 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(s) and a (C6-C30)aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

b and i represent 1; c, d, j, m, and n each independently represent 1 or 2; e, f, g, f′, k, l, and o each independently represent an integer of 1 to 4; g′ represents an integer of 1 to 3; in which if c to g, f′, g′, l, m, n, and o are an integer of 2 or more, each of R 12 to each of R 19 and each of R 25 to each of R 28 may be the same as or different from each other; and

Ar 2 , Ar 3 , and L 1 to L 3 are as defined in claim 1 .

5 . The plurality of host materials according to claim 1 , wherein HAr of formula 1 is at least one selected from the following structures:

in formulas 1-5 to 1-7,

X 1 to X 8 each independently represent CR 25 or N;

R 25 , Ar 7 , and Ar 8 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl, wherein R 25 may be linked to an adjacent substituent to form a ring(s); and

* represents a site linked to dibenzoselenophene.

6 . 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:

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

8 . An organic electroluminescent device comprising an anode; a cathode; and at least one light-emitting layer between the anode and the cathode, wherein at least one of the light-emitting layers comprises the plurality of host materials according to claim 1 .