ORGANIC ELECTROLUMINESCENT COMPOUND AND ORGANIC ELECTROLUMINESCENT DEVICE COMPRISING THE SAME

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

wherein

X represents O or S;

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

Ar represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or −NR 11 R 12 ;

R 1 to R 3 , each independently, represent hydrogen, deuterium, a substituted or unsubstituted (C1-C10)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or —NR 13 R 14 ; or are linked to adjacent R 1 , R 2 and R 3 , respectively, to form a substituted or unsubstituted, mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, or the combination thereof, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur;

R 11 to R 14 , each independently, represent a substituted or unsubstituted (C1-C10)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;

n represents 1 or 2; where if n represents 2, each Ar may be the same or different;

a and b, each independently, represent an integer of 1 to 3; c represents an integer of 1 to 4; where if a to c, each independently, represent an integer of 2 or more, each of R 1 to R 3 may be the same or different; and

the heteroaryl(ene) contains at least one heteroatom selected from B, N, O, S, Si, and P.

2 . The organic electroluminescent compound according to claim 1 , wherein the substituents of the substituted aryl(ene), the substituted heteroaryl(ene), the substituted alkyl, and the substituted mono- or polycyclic, alicyclic or aromatic ring, or the combination thereof, in L, Ar, R 1 to R 3 , and R 11 to R 14 , 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 (C 3 -C30)cycloalkyl; a (C 3 -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 a (C1-C30)alkyl or a (C6-C30)aryl; a (C6-C30)aryl unsubstituted or substituted with a (3- 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

L represents a single bond, a substituted or unsubstituted (C6-C25)arylene, or a substituted or unsubstituted (5- to 25-membered)heteroarylene;

Ar represents a substituted or unsubstituted (C6-C25)aryl, a substituted or unsubstituted (5- to 25-membered)heteroaryl, or —NR 11 R 12 ;

R 1 to R 3 , each independently, represent hydrogen, a substituted or unsubstituted (C6-C25)aryl, a substituted or unsubstituted (5- to 25-membered)heteroaryl, or —NR 13 R 14 ; or are linked to adjacent R 1 , R 2 and R 3 , respectively, to form a substituted or unsubstituted, mono- or polycyclic, (C5-C25) alicyclic or aromatic ring, or the combination thereof, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur;

R 11 to R 14 , each independently, represent a substituted or unsubstituted (C6-C25)aryl, or a substituted or unsubstituted (5- to 25-membered)heteroaryl; and

a to c, each independently, represent 1 or 2.

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

L represents a single bond, a substituted or unsubstituted (C6-C18)arylene, or a substituted or unsubstituted (5- to 18-membered)heteroarylene;

Ar represents a substituted or unsubstituted (C6-C18)aryl, a substituted or unsubstituted (5- to 18-membered)heteroaryl, or —NR 11 R 12 ;

R 1 to R 3 , each independently, represent hydrogen, a substituted or unsubstituted (C6-C18)aryl, a substituted or unsubstituted (5- to 18-membered)heteroaryl, or —NR 13 R 14 ; or are linked to adjacent R 1 , R 2 and R 3 , respectively, to form an unsubstituted, mono- or polycyclic, (C5-C18) aromatic ring;

R 11 to R 14 , each independently, represent a substituted or unsubstituted (C6-C18)aryl; and

a to c, each independently, represent 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 . A host material comprising the organic electroluminescent compound according to claim 1 .

7 . An electron buffer material comprising the organic electroluminescent compound according to claim 1 .

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

9 . The organic electroluminescent device according to claim 8 , wherein the organic electroluminescent device comprises at least one light-emitting layer disposed between a first electrode and a second electrode, wherein the light-emitting layer comprises a host and a dopant, wherein the host comprises a plurality of host compounds, and wherein at least one host compound of the plurality of host compounds is the organic electroluminescent compound.

10 . The organic electroluminescent device according to claim 8 , wherein the organic electroluminescent device comprises a first electrode; a second electrode facing the first electrode; a light-emitting layer between the first electrode and the second electrode; and an electron transport layer and an electron buffer layer between the light-emitting layer and the second electrode, and wherein the electron buffer layer comprises the organic electroluminescent compound.