Organic light-emitting device and method of manufacturing the same

• US 20070029928A1
• Filed: 08/07/2006
• Published: 02/08/2007
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Jong-Hyuk, Oh, Min-Ho, Lee, Byoung-Duk, Choi, Jin-Baek, Kim, Won-Jong, Cho, Yoon-Hyeung
• Granted Patent: US 8,624,490 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 2102/3026 Top emission
• 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 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

An organic light-emitting device including a first substrate with an array of organic light-emitting pixels formed thereon, and a second substrate is disclosed. A transparent moisture absorption layer is disposed between the first and second substrates. The transparent moisture absorption layer efficiently absorbs moisture and/or oxygen, and thus the lifetime characteristics of the organic light-emitting device are improved. The transparent moisture absorption layer has a transmittance of about 85% or higher with respect to visible light. The layer has a thickness of about 10 to about 60,000 nm and a refractive index of about 1.45 to about 1.65 in an inert and/air atmosphere. The layer is formed on the second substrate by using chemical vapor deposition or physical vapor deposition.

Claims

1. An organic light-emitting device comprising:

a first substrate;

an array of organic light-emitting pixels formed on the first substrate;

a second substrate opposing the first substrate and comprising an interior surface facing the first substrate; and

a substantially transparent desiccant layer interposed between the first substrate and the second substrate, the layer comprising metal oxide having an average particle size of about 100 nm or less, at least part of the layer having a transmittance of about 85% or higher with respect to visible light and a refractive index of about 1.45 to about 1.65.

2. The device of claim 1, wherein the desiccant layer is disposed on the interior surface the second substrate.

3. The device of claim 1, wherein the desiccant layer is formed on the first substrate.

4. The device of claim 1, wherein the desiccant layer is formed between the first substrate and the array.

5. The device of claim 1, wherein the desiccant layer is formed on the array.

6. The device of claim 1, wherein the device is configured to emit visible light through the second substrate.

7. The device of claim 1, wherein the desiccant layer has a thickness of about 10 to about 60,000 nm.

8. The device of claim 1, wherein the metal oxide comprises alkali metal oxide or alkaline earth metal oxide.

9. The device of claim 1, wherein the metal oxide comprises one or more selected from a group consisting of lithium oxide (Li₂O), sodium oxide (Na₂O), potassium oxide (K₂O), barium oxide (BaO), calcium oxide (CaO), and magnesium oxide (MgO).

10. A method of manufacturing an organic light-emitting device, the method comprising:

providing a device comprising a first substrate and an array of organic light-emitting pixels form over the first substrate, the array comprising a top surface, the first substrate comprising a first surface where the array is not formed;

placing a second substrate comprising a second surface such that the second surface faces the first substrate;

interconnecting the first and second substrates with a sealant, wherein the first substrate, the second substrate and the sealant form an enclosed space where the array is located; and

prior to interconnecting, forming a desiccant layer on at least one of the first surface, the second surface and the top surface, wherein the desiccant layer comprising metal oxide, wherein forming the desiccant layer comprises physical vapor deposition or chemical vapor deposition.

11. The method of claim 10, wherein the metal oxide is in a particulate form having an average particle size of about 100 nm or less.

12. The method of claim 10, wherein at least part of the desiccant layer has a transmittance of about 85% or higher with respect to a visible light and a refractive index of about 1.45 to about 1.65.

13. The method of claim 10, wherein the desiccant layer has a thickness of about 10 to about 60,000 nm.

14. The method of claim 10, wherein forming the desiccant layer comprises depositing metal in an oxygen atmosphere.

15. The method of claim 10, wherein forming the desiccant layer comprises depositing a metal layer and oxidizing at least part of the metal in the metal layer.

16. The method of claim 10, wherein forming the desiccant layer comprises depositing the desiccant layer on the second substrate at a temperature of the second substrate from about 20 to about 400°

C.

17. The method of claim 10, wherein forming the desiccant layer comprises depositing the desiccant layer on the array at a temperature of the first substrate from about 20 to about 100°

C.

18. An organic light-emitting device produced by the method of claims 10.