Organic electroluminescent compound and organic electroluminescent device comprising the same

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

wherein

Y 1 to Y 14 each independently represent N or CR 1 , in which if a plurality of R 1 's is present, each R 1 may be the same or different;

with the proviso that at least a pair of Y 1 to Y 14 wherein two of Y 1 to Y 14 are adjacent to each other are fused with the following formula 2 to form a ring:

Z represents NR 2 , O, S, CR 3 R 4 or SiR 5 R 6 ;

X 1 to X 4 each independently represent N or CR 7 , in which if a plurality of R 7 's is present, each R 7 may be the same or different;

the dotted line represents a site fused with the adjacent two of Y 1 to Y 14 of formula 1;

R 2 represents

wherein represents the bonding site of La to the nitrogen of NR 2 ;

La represents a single bond, 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 represents 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, a substituted or unsubstituted (C6-C30)aryl(3- to 30-membered)heteroarylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino;

R 1 and R 7 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, a substituted or unsubstituted (C6-C30)aryl(3- to 30-membered)heteroarylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or adjacent two R 1 's or adjacent two R 7 's may be linked to each other to form a ring;

R 3 to R 6 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl; or R 3 and R 4 , or R 5 and R 6 may be linked to each other to form a ring; and

a is an integer of 1 to 4, in which if a is 2 or more, each Ar may be the same or different.

2. The organic electroluminescent compound according to claim 1 , wherein the substituents of the substituted (C1-C30)alkyl, the substituted (C6-C30)aryl(ene), the substituted (3- to 30-membered) heteroaryl(ene), the substituted (C3-C30)cycloalkyl(ene), the substituted (C1-C30)alkoxy, the substituted tri(C1-C30)alkylsilyl, the substituted di(C1-C30)alkyl(C6-C30)arylsilyl, the substituted (C1-C30)alkyldi(C6-C30)arylsilyl, the substituted tri(C6-C30)arylsilyl, the substituted mono- or di-(C1-C30)alkylamino, the substituted mono- or di-(C6-C30)arylamino, the substituted (C6-C30)aryl(3- to 30-membered)heteroarylamino, and the substituted (C1-C30)alkyl(C6-C30)arylamino in La, Ar, R 1 , and R 3 to R 7 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 (5- to 30-membered)heteroaryl unsubstituted or substituted with a (C6-C30)aryl; a (C6-C30)aryl unsubstituted or substituted with a (5- to 30-membered)heteroaryl; 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; 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.

3. The organic electroluminescent compound according to claim 1 , wherein

Z represents NR 2 , O or S;

La represents a single bond, a substituted or unsubstituted (C6-C15)arylene, or a substituted or unsubstituted (5- to 15-membered)heteroarylene;

Ar represents a substituted or unsubstituted (C6-C15)aryl, a substituted or unsubstituted (5- to 15-membered)heteroaryl, a substituted or unsubstituted di(C6-C15)arylamino, or a substituted or unsubstituted (C6-C15)aryl(5- to 15-membered)heteroarylamino;

R 1 represents hydrogen;

R 7 represents hydrogen, a substituted or unsubstituted (C6-C15)aryl, a substituted or unsubstituted (5- to 15-membered)heteroaryl, a substituted or unsubstituted di(C6-C15)arylamino, or a substituted or unsubstituted (C6-C15)aryl(5- to 15-membered)heteroarylamino; and

a is 1 or 2.

4. The organic electroluminescent compound according to claim 1 , wherein

Z represents NR 2 , O or S;

La represents a single bond, an unsubstituted (C6-C15)arylene, or an unsubstituted (5- to 15-membered)heteroarylene;

Ar represents an unsubstituted (C6-C15)aryl, a (5- to 15-membered)heteroaryl unsubstituted or substituted with a (C6-C15)aryl, a di(C6-C15)arylamino unsubstituted or substituted with a (C1-C6)alkyl, or an unsubstituted (C6-C15)aryl(5- to 15-membered)heteroarylamino;

R 1 represents hydrogen;

R 7 represents hydrogen, an unsubstituted (C6-C15)aryl, a (5- to 15-membered)heteroaryl unsubstituted or substituted with a (C6-C15)aryl, a di(C6-C15)arylamino unsubstituted or substituted with a (C1-C6)alkyl, or an unsubstituted (C6-C15)aryl(5- to 15-membered)heteroarylamino; and

a is 1 or 2.

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

6. An organic electroluminescent material comprising the organic electroluminescent compound according to claim 1 .

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

8. The organic electroluminescent device according to claim 7 , wherein the organic electroluminescent compound is comprised in a light-emitting layer, a hole transport zone, or both of them.