Light emitting device, display apparatus having the light emitting device, and method of manufacturing the display apparatus

• US 7,368,869 B2
• Filed: 11/30/2004
• Issued: 05/06/2008
• Est. Priority Date: 12/01/2003
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Joon-Hoo, Kim, Hoon, Chung, Jae-Hoon
• Primary Examiner(s): Patel; Ashok
• Application Number:
  US11/000,362
• Publication Number:
  US 20050116638A1
• Time in Patent Office: 1,253 Days
• Field of Search: 313/512, 313/506, 313/504
• US Class Current: 313/512
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/874 including getter material or desiccant

Abstract

A light emitting device includes a light emitting member formed on a substrate, a first blocking layer formed on the light emitting member and an absorbing layer interposed between the light emitting member or the first blocking layer. The first blocking layer prevents oxygen or moisture in air from permeating into the light emitting member generating light. The absorbing layer absorbs the oxygen or the moisture that passes through the first blocking layer. The light emitting device may have reduced volume and improved lifetime.

Claims

1. A light emitting device comprising:

a substrate;

a light emitting member disposed on the substrate to generate a light;

at least one first blocking layer formed on the light emitting member to prevent an oxygen or a moisture from permeating into the first blocking layer; and

at least one absorbing layer formed between the light emitting member and the first blocking layer to absorb a portion of the oxygen or the moisture that passes through the first blocking layer,

wherein the at least one absorbing layer includes different material from the at least one first blocking layer.

2. The light emitting device of claim 1, wherein the absorbing layer forms an oxide or a hydrate by reacting with a portion of the oxygen or the moisture that passes through the first blocking layer.

3. The light emitting device of claim 1, wherein the light emitting member comprises a first electrode, a second electrodes corresponding to the first electrode, and an organic light emitting layer formed between the first electrode and the second electrode.

4. The light emitting device of claim 3, wherein the second electrode comprises a transparent conductive material and the first electrode comprises a non-transparent material.

5. The light emitting device of claim 3, wherein the second electrode comprises a non-transparent conductive material and the first electrode comprises a transparent conductive material.

6. The light emitting device of claim 1, wherein the first blocking layer comprises at least one of silicon oxide, silicon nitride, magnesium oxide, aluminum oxide, aluminum nitride, titanium oxide, or combinations thereof.

7. The light emitting device of claim 1, wherein the first blocking layer comprises at least one of polyacetylen group, polyimide group or combinations thereof.

8. The light emitting device of claim 1, wherein the first blocking layer has a thickness of about 100 to about 100,000 Å

and has an amount of a permeability of the oxygen or the moisture by about 1 to about 60 g/m ² day.

9. The light emitting device of claim 1, wherein a light transmittance index of the first blocking layer is in a range of about 40 to about 100 percent.

10. The light emitting device of claim 1, wherein the absorbing layer comprises at least one calcium oxide, barium oxide, magnesium oxide, aluminum oxide or combinations thereof.

11. The light emitting device of claim 1, wherein the absorbing layer has a thickness of about 1 to about 10 μ

m to adjust a light transmittance index thereof by about 40 to about 90 percent.

12. The light emitting device of claim 1, further comprising a reinforcing member formed on the first blocking layer.

13. The light emitting device of claim 1, wherein a plurality of the first blocking layers and the absorbing layers are alternately disposed on the light emitting member.

14. The light emitting device of claim 1, further comprising a second blocking layer formed between the absorbing layer and the light emitting member.

15. The light emitting device of claim 14, wherein the second blocking layer comprises at least one of silicon oxide, silicon nitride, magnesium oxide, aluminum oxide, aluminum nitride, titanium oxide or combinations thereof.

16. The light emitting device of claim 14, wherein the second blocking layer comprises at least one selected from the group consisting of polyacetylen group, polyimide group or combinations thereof.

17. The light emitting device of claim 14, wherein the absorbing layer comprises at least one of calcium, barium, magnesium, aluminum, calcium oxide, barium oxide, magnesium oxide, aluminum oxide, or combinations thereof.

18. A display apparatus for displaying an image comprising:

a substrate;

a display member disposed on the substrate to generate a red light, a green light and a blue light for displaying the image;

a first blocking layer formed on the light emitting member to prevent oxygen or moisture from permeating into the first blocking layer; and

an absorbing layer interposed between the light emitting member and the first blocking layer to absorb a portion of the oxygen or the moisture that passes through the first blocking layer,

wherein the absorbing layer includes different material from the first blocking layer.

19. The display apparatus of claim 18, wherein the absorbing layer forms an oxide or a hydrate by reacting with a portion of the oxygen or the moisture that passes through the first blocking layer.

20. A method of manufacturing a display apparatus comprising:

forming a display member for generating a light on a substrate;

forming an absorbing layer on the display member to absorb an oxygen or a moisture that is permeated into the absorbing layer; and

forming a first blocking layer to prevent the oxygen or the moisture from permeating into the first blocking layer,

wherein the absorbing layer includes different material from the first blocking layer.

21. The method of claim 20, wherein the absorbing layer is formed to form an oxide or a hydrate by reacting with the oxygen or the moisture.

22. The method of claim 20, wherein forming the display member comprises:

forming a first electrode on the substrate using a transparent conductive material;

forming an organic light emitting layer on the first electrode; and

forming a second electrode on the organic light emitting layer using a non-transparent conductive material.

23. The method of claim 20, wherein forming the display member comprises:

forming a first electrode on the substrate using a non-transparent conductive material;

forming an organic light emitting layer on the first electrode; and

forming a second electrode on the organic light emitting layer using a transparent conductive material.

24. The method of claim 20, wherein the absorbing layer is formed using at least one of calcium, barium, magnesium, aluminum, calcium oxide, barium oxide, magnesium oxide, aluminum oxide or combinations thereof.

25. The method of claim 20, wherein the first blocking layer is formed using at least one of silicon oxide, silicon nitride, magnesium oxide, aluminum oxide, aluminum nitride, titanium oxide or combinations thereof.

26. The method of claim 20, wherein the first blocking layer is formed using at least one of polyacetylen group, polyimide or combinations thereof group.

27. The method of claim 20, further comprising forming a second blocking layer between the display member and the absorbing layer.

28. The method of claim 27, wherein the second blocking layer is formed using any one selected from the group consisting of silicon oxide, silicon nitride, magnesium oxide, aluminum oxide, aluminum nitride and titanium oxide.

29. The method of claim 27, wherein the second blocking layer is formed using at least one of polyacetylen group, polyimide or combinations thereof.

30. The method of claim 27, wherein the absorbing layer is formed using at least one of calcium, barium, magnesium, aluminum, calcium oxide, barium oxide, magnesium oxide, aluminum oxide or combinations thereof.

31. A light emitting device comprising:

a substrate;

a light emitting member disposed on the substrate to generate a light;

at least one first blocking layer formed on the light emitting member to prevent an oxygen or a moisture from permeating into the first blocking layer;

at least one absorbing layer formed between the light emitting member and the first blocking layer to absorb a portion of the oxygen or the moisture that passes through the first blocking layer; and

a reinforcing member formed on the first blocking layer.

32. A light emitting device comprising:

a substrate;

a light emitting member disposed on the substrate to generate a light;

at least one first blocking layer formed on the light emitting member to prevent an oxygen or a moisture from permeating into the first blocking layer; and

at least one absorbing layer formed between the light emitting member and the first blocking layer to absorb a portion of the oxygen or the moisture that passes through the first blocking layer,

wherein a plurality of the first blocking layers and the absorbing layers are alternately disposed on the light emitting member.

33. A light emitting device comprising:

a substrate;

a light emitting member disposed on the substrate to generate a light;

at least one first blocking layer formed on the light emitting member to prevent an oxygen or a moisture from permeating into the first blocking layer; and

at least one absorbing layer formed between the light emitting member and the first blocking layer to absorb a portion of the oxygen or the moisture that passes through the first blocking layer; and

a second blocking layer formed between the absorbing layer and the light emitting member.

34. A method of manufacturing a display apparatus comprising:

forming a display member for generating a light on a substrate;

forming an absorbing layer on the display member to absorb an oxygen or a moisture that is permeated into the absorbing layer;

forming a first blocking layer to prevent the oxygen or the moisture from permeating into the first blocking layer; and

forming a second blocking layer between the display member and the absorbing layer.