Organic electroluminescence device and manufacturing method thereof

• US 8,052,499 B2
• Filed: 06/29/2010
• Issued: 11/08/2011
• Est. Priority Date: 04/06/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Hae-Seung, Lee, Jong-Hyuk, Kim, Won-Jong, Cho, Yoon-Hyeung, Yang, Hyun-Jung
• Primary Examiner(s): Won; Bumsuk
• Application Number:
  US12/825,442
• Publication Number:
  US 20100264815A1
• Time in Patent Office: 497 Days
• Field of Search: 445/24, 445/25
• US Class Current: 445/24
• CPC Class Codes: H01L 23/26 including materials for absorbing or reacting with moisture or other undesired substances , e.g. getters
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2924/12044 OLED
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor

Abstract

An organic electroluminescence (EL) device which has a rear substrate, an organic EL element formed on the rear substrate and having a laminate structure in which a first electrode, an organic layer and a second electrode are sequentially laminated, a front substrate coupled to the rear substrate via sealant to seal an internal space in which the organic EL element is accommodated, and a transparent nanoporous oxide layer having nanoporous oxide particles disposed in the internal space formed by the rear substrate and the front substrate. Since the organic electroluminescence device includes the transparent nanoporous oxide layer having the nanoporous oxide particles and pores, it has an improved lifetime by increased moisture and oxygen absorbing properties.

Claims

1. A method of manufacturing an organic electroluminescence device, comprising:

preparing a front substrate and a rear substrate having an organic electroluminescence element comprising a first electrode, an organic layer and a second electrode;

forming a transparent nanoporous oxide layer in an internal space formed by the rear substrate and the front substrate, wherein the step of forming the transparent nanoporous oxide layer comprises dispersing nanoporous oxide particles in a solvent and optionally acid to give a sol-state composition, coating the sol-state composition, and drying and heat-treating the coated composition;

applying a sealant on a peripheral portion of the organic electroluminescence element of at least one of the rear substrate and the front substrate; and

coupling the rear substrate and the front substrate to each other via the sealant to seal said internal space.

2. The method of claim 1, wherein the heat-treatment is performed at a temperature of not greater than 250 °

C.

3. The method of claim 1, wherein the step of dispersing the nanoporous oxide particles in the solvent and optionally the acid comprises adjusting pH to about 1 to about 8 by adding the solvent and optionally the acid, and adding the nanoporous oxide particles to the solvent.

4. The method of claim 1, wherein the solvent is at least one selected from the group consisting of ethanol, methanol, propanol, butanol, isopropanol. methylethylketone, pure water, propyleneglycol (mono)methylether (PGM), isopropylcellulose (IPC), methylene chloride (MC), and ethylene carbonate (EC).

5. The method of claim 1, wherein the acid is at least one selected from the group consisting of nitric acid, hydrochloric acid, sulfuric acid and acetic acid.

6. The method of claim 1, wherein the solvent is used in an amount of 60 to 99 parts by weight based on 100 parts by weight of the nanoporous oxide particles.

7. The method of claim 1, wherein the solvent is used in an amount of 60 to 99 parts by weight and the acid in an amount of 0.01 to 0.1 parts by weight, based on 100 parts by weight of the nanoporous oxide particles.

8. The method of claim 1, wherein the nanoporous oxide particles are of at least one kind selected from the group consisting of alkali metal oxide, alkali earth metal oxide, metal halide, metal sulfate and metal perchlorate.

9. The method of claim 8, wherein the nanoporous oxide particles are at least one selected from the group consisting of lithium oxide (Li₂O), sodium oxide (Na₂O), potassium oxide (K₂O), barium oxide (BaO), calcium oxide (CaO), magnesium oxide (MgO), lithium sulfate (Li₂SO₄), sodium sulfate (Na₂SO₄), calcium sulfate (CaSO₄), magnesium sulfate (MgSO₄), cobalt sulfate (CoSO₄), gallium sulfate (Ga₂(SO₄)₃), titanium sulfate (Ti(SO₄)₂), nickel sulfate (NiSO₄), calcium chloride (CaCl₂), magnesium chloride (MgCl₂), strontium chloride (SrCl₂), yttrium chloride (YCl₂), copper chloride (CuCl₂), cesium fluoride (CsF), tantalum fluoride (TaF₅), niobium fluoride (NbF₅), lithium bromide (LiBr), calcium bromide (CaBr₃), cerium bromide (CeBr₄), selenium bromide (SeBr₂), vanadium bromide (VBr₂), magnesium bromide (MgBr₂), barium iodide (BaI₂), magnesium iodide (MgI₂), barium perchlorate (Ba(ClO₄)₂), and magnesium perchlorate (Mg(ClO₄)₂).

10. An organic electroluminescence (EL) device manufactured by the method of claim 9, comprising:

the rear substrate;

the organic electroluminescence element formed on the rear substrate, said organic electroluminescence element comprising the first electrode, the organic layer and the second electrode;

the front substrate being coupled to the rear substrate via the sealant applied to the peripheral portion, sealing an internal space in which the organic electroluminescence element is accommodated; and

the transparent porous oxide layer formed on one of said front substrate, said rear substrate and said sealant to absorb moisture in said internal space, said transparent porous oxide layer maintaining a transparent state before and after absorbing moisture.

11. The method of claim 1, wherein the nanoporous oxide particles have an average particle diameter of not greater than 100 nm.

12. The method of claim 1, wherein the nanoporous oxide particles have an average particle diameter of 20 nm to 100 nm.

13. The method of claim 1, wherein the transparent nanoporous oxide layer is made of calcium oxide (CaO).

14. The method of claim 1, wherein the front substrate comprises glass or plastic.

15. The method of claim 1, wherein the front substrate comprises plastic and a protection layer to protect the front substrate.

16. The method of claim 1, further comprising one of the step of vacuuming the internal space and the step of filling the internal space with inert gas.

17. The method of claim 1, wherein the transparent porous oxide layer is formed on the inner surface of the front substrate.

18. The method of claim 1, wherein the transparent porous oxide layer is formed on the sealant.

19. The method of claim 1, wherein one of the rear substrate and the front substrate has a recess in which the transparent porous oxide layer is formed.

20. The method of claim 1, wherein the step of coating the sol-state composition is performed by a method selected from the group consisting of spin coating, spray coating, deep coating, dispensing, and printing.

21. The method of claim 1, wherein the step of coating the sol-state composition is performed by spray coating.

22. The method of claim 1, wherein the front substrate is unetched flat glass.

23. The method of claim 1, wherein the nanoporous oxide particles are dispersed in the solvent by using electrostatic repulsion.

24. An organic electroluminescence device manufactured by the method of claim 1.