Organic electroluminescent device and method of fabricating the same

1. An organic electroluminescent display device, comprising:

a substrate having a plurality of sub-pixel regions for red, green and blue;

a driving device on the substrate;

a first electrode connected to the driving device, a hole being injected from the first electrode;

a second electrode over the first electrode, an electron being injected from the second electrode; and

a light emitting material layer interposed between the first and second electrodes within each of the sub-pixel regions, the light emitting material layer within at least one of the plurality of sub-pixel regions includes a fluorescent material and excludes a phosphorescent material and the light emitting material layer within the other ones of the plurality of sub-pixel regions include a phosphorescent material.

2. The device according to claim 1 , wherein the first electrode includes one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

3. The device according to claim 1 , wherein the second electrode includes one of aluminum (Al), calcium (Ca), and magnesium (Mg).

4. The device according to claim 1 , wherein the second electrode includes a double layer structure including lithium fluorine/aluminum (LiF/Al).

5. The device according to claim 1 , further comprising a hole injection layer and a hole transporting layer between the first electrode and the light emitting material layer within each of the sub-pixel regions, and an electron transport layer between the second electrode and the light emitting material layer within each of the sub-pixel regions.

6. The device according to claim 5 , further comprising a hole blocking layer between the light emitting material layer within the other ones of the plurality of sub-pixel regions having the phosphorescent material and the electron transport layer.

7. The device according to claim 1 , wherein each of the sub-pixel regions includes different materials.

8. An organic electroluminescent display device, comprising:

a substrate;

a first electrode disposed along a first direction on the substrate, a hole being injected from the first electrode;

a second electrode disposed along a second direction perpendicular to the first direction over the first electrode, an electron being injected from the second electrode;

a plurality of sub-pixel regions for red, green and blue disposed at intersections of the first and second electrodes; and

a light emitting material layer interposed between the first and second electrodes for each of the sub-pixel regions, the light emitting material layer within at least one sub-pixel region includes a fluorescent material and excludes a phosphorescent material and the light emitting material layer within the other ones of the plurality of sub-pixel regions include a phosphorescent material.

9. The device according to claim 8 , wherein the first electrode includes one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

10. The device according to claim 8 , wherein the second electrode includes one of aluminum (Al), calcium (Ca), and magnesium (Mg).

11. The device according to claim 8 , wherein the second electrode includes a double layer structure including lithium fluorine/aluminum (LiF/Al).

12. The device according to claim 8 , further comprising a hole injection layer and a hole transporting layer between the first electrode and the light emitting material layer within each of the sub-pixel regions, and an electron transport layer between the second electrode and the light emitting material layer within each of the sub-pixel regions.

13. The device according to claim 12 , further comprising a hole blocking layer between the light emitting material layer within the other ones of the plurality of sub-pixel regions having the phosphorescent material and the electron transport layer.

14. A method of fabricating an organic electroluminescent display device, comprising:

forming a plurality of sub-pixel regions for red, green and blue on a substrate;

forming a driving device on the substrate;

forming a first electrode connected to the driving device, a hole being injected from the first electrode;

forming a second electrode over the first electrode, an electron being injected from the second electrode; and

forming a light emitting material layer interposed between the first and second electrodes within each of the sub-pixel regions, the light emitting material layer within at least one of the plurality of sub-pixel regions includes a fluorescent material and excludes a phosphorescent material and the light emitting material layer of the other ones of the plurality of sub-pixel regions include a phosphorescent material.

15. The method according to claim 14 , wherein the first electrode includes one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

16. The method according to claim 14 , wherein the second electrode includes one of aluminum (Al), calcium (Ca), and magnesium (Mg).

17. The method according to claim 14 , wherein the second electrode includes a double layer structure including lithium fluorine/aluminum (LiF/Al).

18. The method according to claim 14 , further comprising steps of:

forming a hole injection layer and a hole transporting layer between the first electrode and the light emitting material layer within each of the sub-pixel regions; and

forming an electron transport layer between the second electrode and the light emitting material layer within each of the sub-pixel regions.

19. The method according to claim 18 , further comprising a step of forming a hole blocking layer between the light emitting material layer within the other ones of the plurality of sub-pixel regions having the phosphorescent material and the electron transport layer.

20. The method according to claim 14 , wherein each of the sub-pixel regions includes different materials.

21. A method of fabricating an organic electroluminescent display device, comprising:

forming a first electrode disposed along a first direction on a substrate, a hole being injected from the first electrode;

forming a second electrode disposed along a second direction perpendicular to the first direction over the first electrode, an electron being injected from the second electrode;

forming a plurality of sub-pixel regions for red, green and blue disposed at intersections of the first and second electrodes; and

forming a light emitting material layer interposed between the first and second electrodes within each of the sub-pixel regions, the light emitting material layer of at least one sub-pixel region includes a fluorescent material and excludes a phosphorescent material and the light emitting material layer of the other ones of the plurality of sub-pixel regions include a phosphorescent material.

22. The method according to claim 21 , wherein the first electrode includes one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

23. The method according to claim 21 , wherein the second electrode includes one of aluminum (Al), calcium (Ca), and magnesium (Mg).

24. The method according to claim 21 , wherein the second electrode includes a double layer structure including lithium fluorine/aluminum (LiF/Al).

25. The method according to claim 21 , further comprising steps of:

forming a hole injection layer and a hole transporting layer between the first electrode and the light emitting material layer within each of the sub-pixel regions; and

forming an electron transport layer between the second electrode and the light emitting material layer within each of the sub-pixel regions.

26. The method according to claim 25 , further comprising a step of forming a hole blocking layer between the light emitting material layer within the other ones of the plurality of sub-pixel regions having the phosphorescent material and the electron transport layer.

27. The method according to claim 21 , wherein each of the sub-pixel regions includes different materials.