Method of fabricating light extraction substrate for organic light emitting device

Patent metadata

Field	Value
Publication number	US-9688571-B2
Application number	US-201414906122-A
Country	US
Kind code	B2
Filing date	Jul 17, 2014
Priority date	Jul 17, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A method of fabricating a light extraction substrate for an organic light-emitting device which can increase the extraction efficiency of light emitted from the organic light-emitting device, thereby improving the overall luminous efficiency of the organic light-emitting device. Water glass is applied on a surface of a glass substrate. The water glass applied on the glass substrate is heat-treated such the surface of the glass substrate is roughened. The heat-treated water glass is removed from the glass substrate. A planarization layer of a glass frit is formed on the glass substrate from which the water glass has been removed.

First claim

What is claimed is:

1. A method of fabricating a light extraction substrate for an organic light-emitting device, the method comprising:
applying water glass on a surface of a glass substrate;
heat-treating the water glass applied on the surface of the glass substrate such that the surface of the glass substrate is roughened;
removing the heat-treated water glass from the glass substrate; and
forming a planarization layer of a glass frit on the roughened surface of the glass substrate.

2. The method according to claim 1 , wherein the water glass is heat-treated at a temperature ranging from 150 to 500° C.

3. The method according to claim 2 , wherein the water glass is heat-treated at 170° C.

4. The method according to claim 2 , wherein distances between peaks in a roughness profile of the roughened surface are controlled to be 50 μm or less.

5. The method according to claim 4 , wherein a geometry of each peak viewed from above comprises at least one selected from the group consisting of a circle, a polygon and an irregular shape.

6. The method according to claim 4 , wherein the peaks are arranged to form a honeycomb pattern.

7. The method according to claim 2 , wherein, a surface roughness of the roughened surface of the glass substrate after removing the heat-treated water glass is controlled in a range from 1 to 35 μm.

8. The method according to claim 1 , wherein the water glass is applied on the surface of the glass substrate by bar coating.

9. The method according to claim 1 , wherein the glass frit has a refractive index ranging from 1.85 to 1.95.

10. The method according to claim 9 , wherein forming the planarization layer comprises:
applying a paste of the glass frit on the roughened surface of the glass substrate; and
firing the paste of the glass frit applied on the roughened surface of the glass substrate.

Assignees

• Corning Prec Materials Co Ltd

Inventors

• Lee Ki Yeon
• Yoon Kyung Min
• Lee Young Suk
• Lee Jae Ho

Classifications

• C03C17/25

  by deposition from the liquid phase · CPC title

• G02B5/0215 Primary

  the surface having a regular structure · CPC title

• G02B5/0278

  used in transmission · CPC title

• H01L51/5275

  Electricity · mapped topic

• C03C2218/11

  from solutions or suspensions · CPC title