ORGANIC ELECTROLUMINESCENT COMPOUND AND ORGANIC ELECTROLUMINESCENT DEVICE COMPRISING THE SAME

1 . An organic electroluminescent compound represented by the following formula

wherein

B 1 to B 7 , each independently, are not present or represent a substituted or unsubstituted (C5-C20) ring, in which the carbon atom of the ring may be replaced with one or more heteroatoms selected from nitrogen, oxygen and sulfur; with the proviso that at least five of B 1 to B 7 are present, and the adjacent rings of B 1 to B 7 are fused with each other;

Y represents —N-L 1 -(Ar 1 ) n , —O—, —S—, or —CR 1 R 2 ;

L 1 represents 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 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —NR 3 R 4 ;

R 1 to R 4 , 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, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent(s) to form a ring(s); and

n represents an integer of 1 or 2; where if n represents 2, each of Ar 1 may be the same as or different from each other.

2 . The organic electroluminescent compound according to claim 1 , wherein B 1 to B 7 , each independently, are not present or represent a substituted or unsubstituted benzene ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted pyrrole ring, a substituted or unsubstituted furan ring, a substituted or unsubstituted thiophene ring, a substituted or unsubstituted cyclopentadiene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted pyridine ring, or a substituted or unsubstituted dibenzofuran ring; with the proviso that at least five of B 1 to B 7 are present, and the adjacent rings of B 1 to B 7 are fused with each other.

3 . The organic electroluminescent compound according to claim 1 , wherein the formula 1 is represented by any one of the following formulas 1-1 to 1-5:

wherein

Y 1 , Y 2 , Y 3 , and Y 4 , each independently, are the same as the definition of Y in claim 1 , and where if a plurality of Ar 1 is present, each of Ar 1 may be the same as or different from each other;

X 1 to X 12 , each independently, represent —N═ or —C(R a )═; and

R a , 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, or a substituted or unsubstituted (C3-C30)cycloalkyl; or adjacent R a 's may be linked to each other to form a ring(s); and where if a plurality of R a is present, each of R a may be the same as or different from each other.

4 . The organic electroluminescent compound according to claim 3 , wherein at least one of Ar 1 (s) and R a (s) represents any one selected from those listed in the following Group 1:

in Group 1,

D1 and D2, each independently, represent a benzene ring or a naphthalene ring;

X 21 represents O, S, NRs, or CR 6 R 7 ;

X 22 , each independently, represent CR 8 or N; with the proviso that at least one of X 22 represents N;

X 23 , each independently, represent CR 9 or N;

L 11 to L 18 , each independently, represent a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;

R 11 to R 21 , and R 5 to R 9 , 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, or a substituted or unsubstituted (C3-C30)cycloalkyl; or may be linked to an adjacent substituent(s) to form a ring(s);

aa, ff, and gg, each independently, represent an integer of 1 to 5; bb represents an integer of 1 to 7; and cc, dd, and ee, each independently, represent an integer of 1 to 4.

5 . The organic electroluminescent compound according to claim 3 , wherein the substituents of the substituted (C1-C30)alkyl(ene), the substituted (C6-C30)aryl(ene), the substituted (3- to 30-membered)heteroaryl(ene), and the substituted (C3-C30)cycloalkyl(ene) in Ar 1 , L 1 , R 1 to R 4 , and R a , each independently, are at least one selected from the group consisting of deuterium; a halogen; a cyano; a carboxyl; a nitro; a hydroxyl; 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 (C6-C30)aryl unsubstituted or substituted with at least one selected from the group consisting of deuterium and a (3- to 30-membered)heteroaryl(s); a (3- to 30-membered)heteroaryl unsubstituted or substituted with a (C6-C30)aryl(s); a tri(C1-C30)alkylsilyl; a tri(C6-C30)arylsilyl; a di(C1-C30)alkyl(C6-C30)arylsilyl; a (C1-C30)alkyldi(C6-C30)arylsilyl; an amino; a mono- or di-(C1-C30)alkylamino; a mono- or di-(C6-C30)arylamino unsubstituted or substituted with a (C1-C30)alkyl(s); a (C1-C30)alkyl(C6-C30)arylamino; a (C1-C30)alkylcarbonyl; a (C1-C30)alkoxycarbonyl; a (C6-C30)arylcarbonyl; 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.

6 . The organic electroluminescent compound according to claim 3 , wherein at least one of Ar 1 (s) and R a (s) represents any one selected from those listed in the following Groups 2 and 3:

in Group 2,

L represents 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; and

A 1 to A 3 , each independently, represent a substituted or unsubstituted (C1-C30)alkyl, or a substituted or unsubstituted (C6-C30)aryl.

7 . The organic electroluminescent compound according to claim 1 , wherein the compound represented by formula 1 is selected from the group consisting of the following compounds:

8 . A plurality of host materials comprising a first host material and a second host material, wherein the first host material comprises the compound represented by formula 1 according to claim 1 , and the second host material comprises an organic electroluminescent compound other than the compound represented by formula 1.

9 . The plurality of host materials according to claim 8 , wherein the second host material comprises a compound represented by the following formula 11:

wherein

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

L b1 represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;

R b1 and R b2 , 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-(C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be linked to an adjacent substituent(s) to form a ring(s);

a represents an integer of 1 to 4; and b represents an integer of 1 to 6; where if a and b, each independently, represent an integer of 2 or more, each of R b1 and each of R b2 may be the same as or different from each other.

10 . An organic electroluminescent device comprising the organic electroluminescent compound according to claim 1 .