Heterocyclic compound and organic light-emitting device including the same

1. A heterocyclic compound comprising a compound represented by Formula 1:

wherein:

Ar is selected from the group consisting of substituted and unsubstituted C 6 -C 60 aryl groups, substituted and unsubstituted C 4 -C 60 heteroaryl groups, amino groups substituted with at least one selected from the group consisting of substituted and unsubstituted C 6 -C 50 aryl groups, and substituted and unsubstituted C 6 -C 60 condensed polycyclic groups; and

each of R 3 through R 5 is independently selected from the group consisting of hydrogen atoms, heavy hydrogen atoms, substituted and unsubstituted C 1 -C 50 alkyl groups, substituted and unsubstituted C 1 -C 50 alkoxy groups, substituted and unsubstituted C 2 -C 50 alkoxycarbonyl groups, substituted and unsubstituted C 6 -C 60 aryl groups, substituted and unsubstituted C 6 -C 50 aryloxy groups, substituted and unsubstituted C 6 -C 50 arylthio groups, amino groups substituted with at least one substituted or unsubstituted C 6 -C 50 aryl groups, substituted and unsubstituted C 3 -C 50 carbocyclic groups, substituted and unsubstituted C 4 -C 60 heteroaryl groups, substituted and unsubstituted C 4 -C 60 heterocyclic groups, substituted and unsubstituted C 6 -C 60 condensed polycyclic groups, halogen atoms, cyano groups, hydroxyl groups, and carboxyl groups; and

each of R 1 and R 2 is independently selected from the group consisting of:

methyl groups;

unsubstituted monocyclic to tricyclic aryl groups selected from the group consisting of phenyl groups, naphthyl groups, biphenyl groups, terphenyl groups, fluorenyl groups, and carbazolyl groups; and

monocyclic to tricyclic aryl groups substituted with one to three substituents selected from the group consisting of C 1 -C 5 alkyl groups, C 1 -C 5 alkoxy groups, cyano groups, C 1 -C 5 alkyl phenoxy groups, phenyl groups, halogen atoms, and —N(R′)(R″) groups wherein each of R′ and R″ is independently selected from the group consisting of hydrogen atoms, C 1 -C 20 alkyl groups, C 6 -C 20 aryl groups, and C 3 -C 20 heteroaryl groups.

2. The heterocyclic compound of claim 1 , wherein Ar is selected from the group consisting of:

unsubstituted monocyclic to tricyclic aryl groups selected from the group consisting of phenyl groups, naphthyl groups, biphenyl groups, terphenyl groups, fluorenyl groups, and carbazolyl groups; and

monocyclic to tricyclic aryl groups substituted with one to three substituents selected from the group consisting of C 1 -C 5 alkyl groups, C 1 -C 5 alkoxy groups, cyano groups, amino groups, phenoxy groups, phenyl groups, and halogen atoms.

3. The heterocyclic compound of claim 1 , wherein the compound of Formula 1 is selected from the group consisting of compounds represented by Formulae 2 through 4:

wherein:

Ar is selected from the group consisting of substituted and unsubstituted C 6 -C 60 aryl groups, substituted and unsubstituted C 4 -C 60 heteroaryl groups, amino groups substituted with at least one substituted or unsubstituted C 6 -C 50 aryl groups, and substituted and unsubstituted C 6 -C 60 condensed polycyclic groups;

R is selected from the group consisting of hydrogen atoms, C 1 -C 5 alkyl groups, C 1 -C 5 alkoxy groups, phenyl groups, and —N(R′)(R″) groups wherein at least one of R′ and R″ is selected from the group consisting of hydrogen atoms, C 1 -C 20 alkyl groups, C 6 -C 20 aryl groups, and C 3 -C 20 heteroaryl groups; and

n is an integer from 1 to 3.

4. The heterocyclic compound of claim 3 , wherein Ar is selected from the group consisting of:

monocyclic to tricyclic aryl groups selected from the group consisting of phenyl groups, naphthyl groups, biphenyl groups, terphenyl groups, fluorenyl groups, and carbazolyl groups, and

monocyclic to tricyclic aryl groups selected from the group consisting of C 6 -C 60 aryl groups, C 4 -C 60 heteroaryl groups, amino groups substituted with at least one substituted or unsubstituted C 6 -C 50 aryl group, and C 6 -C 60 condensed polycyclic groups substituted with one to three substituents selected from the group consisting of C 1 -C 5 alkyl groups, C 1 -C 5 alkoxy groups, cyano groups, amino groups, phenoxy groups, phenyl groups, and halogen atoms.

5. The heterocyclic compound of claim 3 , wherein Ar is selected from the group consisting of:

6. The heterocyclic compound of claim 3 , wherein

is a phenyl group, a naphthyl group, or an anthracenyl group.

7. The heterocyclic compound of claim 1 , wherein the compound represented by Formula 1 is selected from the group consisting of Compounds 5, 8, 21, 26, 30 and 47:

8. An organic light-emitting device comprising a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode, wherein the organic layer comprises at least one organic layer comprising the heterocyclic compound represented by Formula 1 of claim 1 .

9. The organic light-emitting device of claim 8 , wherein the at least one organic layer comprises an electron injection layer or an electron transport layer.

10. The organic light-emitting device of claim 8 , wherein the at least one organic layer comprises an emission layer or a single layer having electron injecting capability and electron transporting capability.

11. The organic light-emitting device of claim 8 , wherein the at least one organic layer comprises an emission layer comprising the heterocyclic compound represented by Formula 1 as a host for a fluorescent or phosphorescent device.

12. The organic light-emitting device of claim 8 , wherein the at least one organic layer comprises an emission layer, and an electron transport layer or an electron injection layer, wherein the electron transport layer or the electron injection layer comprises the heterocyclic compound represented by Formula 1, and the emission layer comprises an anthracene compound or a C 4 -C 60 heteroaryl compound or a styryl compound.

13. The organic light-emitting device of claim 8 , wherein the at least one organic layer comprises an emission layer and an electron transport layer or an electron injection layer, wherein the electron transport layer or the electron injection layer comprises the heterocyclic compound represented by Formula 1, and the emission layer comprises a red emission layer, a green emission layer, a blue emission layer, and a white emission layer, wherein at least one of the red emission layer, the green emission layer, the blue emission layer and the white emission layer comprises a phosphorescent compound.

14. The organic light-emitting device of claim 8 , wherein the at least one organic layer comprises at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, an electron blocking layer, an emission layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

15. The organic light-emitting device of claim 14 , wherein the organic light-emitting device has a first electrode/hole injection layer/emission layer/second electrode structure, a first electrode/hole injection layer/hole transport layer/emission layer/electron transport layer/second electrode structure, or a first electrode/hole injection layer/hole transport layer/emission layer/electron transport layer/electron injection layer/second electrode structure.

16. A flat panel display device comprising the organic light-emitting device of claim 8 , wherein the first electrode of the organic light-emitting device is electrically connected to a source electrode or a drain electrode of a thin film transistor.

17. An organic light-emitting device comprising a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode, wherein the organic layer comprises at least one layer comprising the heterocyclic compound of claim 1 , the at least one layer being formed using a wet process.

18. The heterocyclic compound of claim 1 , wherein the compound represented by Formula 1 is selected from the group consisting of Compounds 1 through 54: