Organic light-emitting device

1. A heterocyclic compound represented by Formula 1 below:

wherein R 1 is an unsubstituted monocyclic to tetracyclic aryl group selected from the group consisting of a naphthyl group, a biphenyl group, a terphenyl group, an anthracenyl group, a fluorenyl group, and a pyrenyl group; an unsubstituted C 3 -C 60 heteroaryl group; a substituted monocyclic to tetracyclic aryl group selected from the group consisting of a naphthyl group, a biphenyl group, a terphenyl group, an anthracenyl group, a fluorenyl group, and a pyrenyl group which is substituted with a C 1 -C 5 alkyl group, a C 1 -C 5 alkoxy group, a cyano group, an amine group, a phenoxy group, a phenyl group or a halogen group; and a substituted C 3 -C 60 heteroaryl group which is substituted with a C 1 -C 5 alkyl group, a C 1 -C 5 alkoxy group, a cyano group, an amine group, a phenoxy group, a phenyl group, a halogen group, or a C 3 -C 10 heteroaryl group;

R 2 and R 3 are each independently a methyl group or a phenyl group;

R 6 is an unsubstituted monocyclic to tetracyclic aryl group selected from the group consisting of a phenyl group, a naphthyl group, a biphenyl group, a terphenyl group, an anthracenyl group, a fluorenyl group, and a pyrenyl group; an unsubstituted C 3 -C 60 heteroaryl group; an unsubstituted C 5 -C 50 aryl amine group; a substituted monocyclic to tetracyclic aryl group selected from the group consisting of a phenyl group, a naphthyl group, a biphenyl group, a terphenyl group, an anthracenyl group, a fluorenyl group, and a pyrenyl group which is substituted with a C 1 -C 5 alkyl group, a C 1 -C 5 alkoxy group, a cyano group, an amine group, a phenoxy group, a phenyl group or a halogen group; a substituted C 3 -C 60 heteroaryl group which is substituted with a C 1 -C 5 alkyl group, a C 1 -C 5 alkoxy group, a cyano group, an amine group, a phenoxy group, a phenyl group, a halogen group or a C 3 -C 10 heteroaryl group; or a substituted C 5 -C 50 arylamine group which is substituted with a C 1 -C 5 alkyl group, a C 1 -C 5 alkoxy group, a cyano group, an amine group, a phenoxy group, a phenyl group or a halogen group; and

R 4 , R 5 , R 7 , R 8 and R 9 is each independently a hydrogen or a deuterium.

2. A compound of one of the compounds below:

3. A compound of one of the compounds below:

4. 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 a first layer including the heterocyclic compound of claim 1 .

5. The organic light-emitting device of claim 4 , wherein the first layer comprises an electron injection layer, an electron transport layer, or a single layer having both an electron injection function and an electron transport function.

6. The organic light-emitting device of claim 4 , wherein the first layer comprises an emission layer.

7. The organic light-emitting device of claim 4 , wherein the first layer comprises an emission layer, and the heterocylic compound is a host or a dopant for a fluorescent or phosphorescent device.

8. The organic light-emitting device of claim 4 , wherein the organic layer comprises an emission layer, an electron injection layer or an electron transport layer, and the emission layer comprises an anthracene compound, an aryl amine compound, or a styryl compound.

9. The organic light-emitting device of claim 4 , wherein the organic layer comprises an emission layer, an electron injection layer or an electron transport layer, and the emission layer comprises a red emission layer, a green emission layer, a blue emission layer or a white emission layer that comprises a phosphorescent compound.

10. The organic light-emitting device of claim 4 , wherein the organic layer further comprises a hole injection layer, a hole transport layer, a functional layer having both hole injection and transport functions, an electron blocking layer, an emission layer, a hole blocking layer, an electron transport layer, an electron injection layer and a combination of at least two of these layers.

11. The organic light-emitting device of claim 10 , wherein at least one of the hole injection layer, the hole transport layer, and the functional layer having both hole injection and transport functions further comprises a charge-generating material.

12. The organic light-emitting device of claim 9 , wherein the electron transport layer comprises an electron transporting organic material and a metal-containing material.

13. The organic light-emitting device of claim 12 , wherein the metal-containing material comprises a lithium complex.

14. The organic light-emitting device of claim 4 , having 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 structure layer/electron injection layer/second electrode structure.

15. The organic light-emitting device of claim 4 , wherein the first layer is formed using a wet process.

16. A flat panel display device comprising the organic light-emitting device of claim 4 , 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.