Organic light-emitting device and method of manufacturing the same

• US 8,624,490 B2
• Filed: 08/07/2006
• Issued: 01/07/2014
• 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: Choi, Jin-Baek, Kim, Won-Jong, Lee, Jong-Hyuk, Cho, Yoon-Hyeung, Oh, Min-Ho, Lee, Byoung-Duk
• Primary Examiner(s): RALEIGH, DONALD L
• Application Number:
  US11/499,927
• Publication Number:
  US 20070029928A1
• Time in Patent Office: 2,710 Days
• Field of Search: 313498-512, 315/169.1, 315/169.3, 428/917, 428690-691, 438 26- 29, 438/34, 438/83, 257/40, 257/72, 257 98-100, 257642-643, 257/759, 257/75, 427/58, 427/64, 427/66, 427532-535, 427/539, 445 24- 25
• US Class Current: 313/512
• 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 comprising glass;

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

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

a substantially transparent vapor deposited desiccant layer interposed between the first substrate and the second substrate, said layer consisting of metal oxide particles of one or more alkali metals or alkaline earth metals, said oxide particles having a particle size from 1 nm to 90 nm, wherein at least part of the layer has a transmittance of 95% or higher with respect to visible light and a refractive index of 1.475 to 1.594, wherein the desiccant layer has a thickness of about 200 nm to about 2,000 nm, wherein the desiccant layer is formed on the array, and wherein the metal oxide comprises one or more selected from a group consisting of sodium oxide (Na₂O), potassium oxide (K₂O), barium oxide (BaO), calcium oxide (CaO), and magnesium oxide (MgO).

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

3. The device of claim 1, wherein the metal oxide particles have a maximum particle size from 1 nm to 90 nm.

4. The device of claim 1, wherein the refractive index of the transparent moisture absorption layer is 1.48, 1.49, 1.50, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, or 1.59.

5. The device of claim 1, wherein the thickness of the transparent moisture absorption layer is 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, or 1900 nm.

6. The device of claim 1, wherein the metal oxide comprises one or more selected from a group consisting of sodium oxide (Na₂O), potassium oxide (K₂O) and magnesium oxide (MgO).

7. The device of claim 1, wherein the particle size is 2, 3, 5, 10, 15, 20, 25, or 30 nm.

8. The device of claim 7, wherein the oxide particles have a maximum particle size of 2, 3, 5, 10, 15, 20, 25, or 30 nm.

9. The device of claim 1, wherein the particle size may be about 35, 40, 50, 60, 70 or 80 nm.

10. The device of claim 9, wherein the oxide particles have a maximum particle size of 35, 40, 50, 60, 70 or 80 nm.

11. The device of claim 5, wherein the thickness of the transparent moisture absorption layer is 400, 450, 500, 600, 700, 800, 900, or 1000 nm.

12. The device of claim 5, wherein the thickness of the transparent moisture absorption layer is 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, or 1900 nm.

13. The device of claim 1, wherein the thickness of the transparent moisture absorption layer is 480 nm.