Light extraction substrate for organic light emitting element, method for manufacturing same, and organic light emitting element comprising same

Patent metadata

Field	Value
Publication number	US-10454071-B2
Application number	US-201415036698-A
Country	US
Kind code	B2
Filing date	Nov 12, 2014
Priority date	Nov 13, 2013
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

The present invention relates to a light extraction substrate for an organic light emitting element, a method for manufacturing the same, and an organic light emitting element comprising the same and, more particularly, to a light extraction substrate for an organic light emitting element exhibiting a good light extraction efficiency, a method for manufacturing the same, and an organic light emitting element comprising the same. To this end, the present invention provides a light extraction substrate for an organic light emitting element, a method for manufacturing the same, and an organic light emitting element comprising the same, the light extraction substrate comprising a first light extraction layer having a plurality of pores formed therein and made of a first metal oxide doped with a dopant; and a second light extraction layer formed on the first light extraction layer and made of a second metal oxide which has a different atomic diffusion rate compared to the first metal oxide.

First claim

The invention claimed is:

1. A light extraction substrate for an organic light-emitting device, comprising:
a first light extraction layer having a plurality of voids formed therein, the first light extraction layer comprising a first metal oxide and a dopant added to the first metal oxide; and
a second light extraction layer disposed on the first light extraction layer, the second light extraction layer comprising a second metal oxide having a different diffusion rate of atoms from the first metal oxide,
wherein the diffusion rate of atoms of the first metal oxide is faster than the diffusion rate of atoms of the second metal oxide, and
wherein the second light extraction layer is positioned between the first light extraction layer and the organic light-emitting device.

2. The light extraction substrate according to claim 1 , wherein a refractive index of the first metal oxide is greater than a refractive index of the second metal oxide.

3. The light extraction substrate according to claim 1 , wherein the first metal oxide is ZnO, and the second metal oxide is Al 2 O 3 .

4. The light extraction substrate according to claim 3 , wherein the dopant is Ga.

5. The light extraction substrate according to claim 4 , wherein a content of the dopant ranges, by weight, from 4.1% to 11.3% of an amount of the first metal oxide.

6. The light extraction substrate according to claim 1 , wherein the plurality of voids are formed in an inward direction of the first light extraction layer from a boundary between the first light extraction layer and the second light extraction layer.

7. The light extraction substrate according to claim 1 , further comprising a planarization layer disposed on the second light extraction layer.

8. A method of fabricating a light extraction substrate for an organic light-emitting device, comprising:
a first light extraction layer forming operation of forming a first light extraction layer, the first light extraction layer comprising a first metal oxide and a dopant added to the first metal oxide;
a second light extraction layer forming operation of forming a second light extraction layer, the second light extraction layer comprising a second metal oxide, a diffusion rate of atoms of which is slower than a diffusion rate of atoms of the first metal oxide, wherein the second light extraction layer is positioned between the first light extraction layer and the organic light-emitting device; and
a void forming operation of forming a plurality of voids within the first light extraction layer through diffusing atoms by heat-treating the first light extraction layer and the second light extraction layer.

9. The method according to claim 8 , wherein Ga is used as the dopant in the first light extraction layer forming operation.

10. The method according to claim 9 , wherein the first light extraction layer forming operation comprises doping the first metal oxide with the Ga with a content ranging, by weight, 4.1% to 11.3% of an amount of the first metal oxide.

11. The method according to claim 10 , wherein the first light extraction layer forming operation comprises depositing ZnO on a substrate by atmospheric pressure chemical vapor deposition.

12. The method according to claim 11 , wherein the second light extraction layer forming operation comprises depositing Al 2 O 3 on the first light extraction layer by electron beam processing or sputtering.

13. The method according to claim 8 , wherein the void forming operation comprises heat-treating the first light extraction layer and the second light extraction layer in a temperature ranging from 600° C. to 800° C.

14. A light-emitting device comprising the light extraction substrate for an organic light-emitting device as claimed in claim 1 on a path on which light generated thereby is emitted out.

15. A light extraction substrate for an organic light-emitting device, comprising:
a first light extraction layer having a plurality of voids formed therein, the first light extraction layer comprising a first metal oxide and a dopant added to the first metal oxide; and
a second, non-porous light extraction layer disposed on the first light extraction layer, the second light extraction layer comprising a second metal oxide having a different diffusion rate of atoms from the first metal oxide,
wherein the diffusion rate of atoms of the first metal oxide is faster than the diffusion rate of atoms of the second metal oxide, and
wherein the second light extraction layer is positioned between the first light extraction layer and the organic light-emitting device.

Assignees

• Corning Prec Materials Co Ltd

Inventors

• Lee Hyun Hee
• Yoon hong
• Kim Seo Hyun
• Park Kyoung Wook
• Park Jeong Woo
• Park June Hyong
• Baek Il Hee
• Yoon Gun Sang
• Lee Joo Young
• Choi Eun Ho

Classifications

• G02B5/0278

  used in transmission · CPC title

• H01L51/56

  Electricity · mapped topic

• H01L51/5268 Primary

  Electricity · mapped topic

• G02B5/0247 Primary

  by means of voids or pores · CPC title

• H10K50/854

  comprising scattering means · CPC title