Organic electroluminescent compound and organic electroluminescent device comprising the same

1. An organic electroluminescent compound represented by the following formula 2:

wherein

X 2 represents O, or S;

Z 1 and Z 2 each independently represent hydrogen, deuterium, or -L 1 -Het, with the proviso that, at least one of Z 1 and Z 2 represents -L 1 -Het;

R represents a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted 3- to 30-membered heteroaryl containing at least one heteroatom selected from N, O and S;

R 1 to R 4 each independently represent hydrogen, deuterium, a substituted or unsubstituted (C1-C10)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted 3- to 30-membered heteroaryl containing at least one heteroatom selected from N, O and S;

L 1 represents a direct bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted 3- to 30-membered heteroarylene containing at least one heteroatom selected from N, O and S;

Het represents a substituted or unsubstituted 3- to 30-membered heteroaryl containing at least one heteroatom selected from N, O and S.

2. The organic electroluminescent compound according to claim 1 , wherein formula 2 is represented by any one of the following formulae 4 and 5:

wherein X 2 , Z 1 , Z 2 , and R are as defined in claim 1 .

3. The organic electroluminescent compound according to claim 1 , wherein substituents of the substituted alkyl, the substituted aryl(ene), and the substituted heteroaryl(ene) in R, R 1 to R 4 , L 1 , and Het 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 3- to 30-membered heteroaryl unsubstituted or substituted with 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.

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

X 2 represents O or S;

Z 1 and Z 2 each independently represent hydrogen or -L 1 -Het, with the proviso that at least one of Z 1 and Z 2 represents -L 1 -Het;

R represents a substituted or unsubstituted (C6-C18)aryl, or a substituted or unsubstituted 5- to 18-membered heteroaryl containing at least one heteroatom selected from N, O and S;

R 1 to R 4 each independently represent hydrogen;

L 1 represents a direct bond, a substituted or unsubstituted (C6-C18)arylene, or a substituted or unsubstituted 5- to 18-membered heteroarylene containing at least one heteroatom selected from N, O and S; and

Het represents a substituted or unsubstituted 5- to 18-membered heteroaryl containing at least one heteroatom selected from N, O and S.

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

X 2 represents O, or S;

Z 1 and Z 2 each independently represent hydrogen or -L 1 -Het, with the proviso that at least one of Z 1 and Z 2 represents -L 1 -Het;

R represents an unsubstituted (C6-C18)aryl, or an unsubstituted 5- to 18-membered heteroaryl containing at least one heteroatom selected from N, O and S;

R 1 to R 4 each independently represent hydrogen;

L 1 represents a direct bond, a (C6-C18)arylene unsubstituted or substituted with a (C1-C6)alkyl, or an unsubstituted 5- to 18-membered heteroarylene containing at least one heteroatom selected from N, O and S; and

Het represents a 5- to 18-membered heteroaryl unsubstituted or substituted with a (C6-C12)aryl, containing at least one heteroatom selected from N, O and S.

6. The organic electroluminescent compound according to claim 1 , wherein Het represents a substituted or unsubstituted pyridine, a substituted or unsubstituted pyrimidine, a substituted or unsubstituted triazine, a substituted or unsubstituted quinoline, a substituted or unsubstituted isoquinoline, a substituted or unsubstituted quinazoline, a substituted or unsubstituted quinoxaline, a substituted or unsubstituted triazole, a substituted or unsubstituted pyrazole, a substituted or unsubstituted benzofuran, a substituted or unsubstituted dibenzofuran, a substituted or unsubstituted benzothiophene, or a substituted or unsubstituted dibenzothiophene.

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

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 compound according to claim 1 is comprised in at least one of an electron transport material, an electron buffer material, and a phosphorescent host material.