Coating compositions comprising polyorgano-silsesquioxane and a wavelength converting agent, and a wavelength converting sheet using the same

Patent metadata

Field	Value
Publication number	US-9567487-B2
Application number	US-201514613789-A
Country	US
Kind code	B2
Filing date	Feb 4, 2015
Priority date	Jan 8, 2015
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

The present invention relates to a coating composition having excellent wavelength conversion efficiency and a wavelength converting thin film/sheet prepared using the same. The coating composition of the present disclosure includes 1 to 60 wt % of polyorgano-silsesquioxane, 0.0001 to 30.0 wt % of a wavelength converting agent, and a solvent, and exhibits a transmittance of 70% or more as compared to that of an aqueous solution. A wavelength converting thin film/sheet prepared by using the coating composition has not only excellent photoluminescence, thermal resistance, and light-fastness, but also moisture and oxygen permeability is low, and the visible light transmittance thereof is 70% or more as compared to that of the air, and when patterning is added, the photoluminescence intensity of sheet is at least two-fold higher than that of a non-patterned sheet. Therefore, the coating composition of the present invention may be conveniently used in the preparation of a wavelength converting thin film/sheet, and feasibly applied to the preparation of a solar cell in an efficient manner.

First claim

What is claimed is:

1. A method for preparing a wavelength converting sheet, comprising the steps of:
(a) applying the following coating composition on a substrate,
wherein the coating composition comprises 1.0 to 60 wt % of polyorgano-silsesquioxane represented by the following Formula 1, 0.0001 to 30 wt % of a wavelength converting agent, and a solvent:

wherein in the Formula 1, R 1 and R 2 are independently selected from the group consisting of a C 1 -C 10 straight chain or branched chain alkyl group, a vinyl group, a C 6 -C 10 aryl group, a C 7 -C 16 aralkyl group, a C 7 -C 16 alkaryl group, a C 3 -C 15 cycloalkyl group, a C 4 -C 20 alkylcycloalkyl group, a methacrylate group, an acrylate group and an epoxy group,
wherein the polyorgano-silsesquioxane has a number average molecular weight in a range of 10 2 to 10 6 , and
wherein the ratio of m to n is in a range of 6:4, and m and n are an integer of 1 to 10,000; and
(b) curing the applied substrate; and
(c) applying a polyorgano-silsesquioxane protective layer.

2. The method of claim 1 , wherein the substrate comprises plastic, stainless steel, aluminum, glass, quartz, a solar cell, an LED chip or a fiber.

3. The method of claim 1 , wherein the sheet has a visible light transmittance of 70% or more compared to that of the air.

4. The method of claim 1 , further comprising patterning a surface of the prepared sheet.

5. A wavelength converting sheet prepared according to the method of claim 1 .

6. The sheet of claim 5 , wherein the sheet is a patterned sheet and has at least two-fold higher photoluminescence intensity as compared to that of a non-patterned sheet.

7. A solar cell comprising the wavelength converting sheet of claim 5 .

8. A method for preparing a solar cell, comprising the steps of: (a) preparing a solar cell; and (b) applying the wavelength converting sheet of claim 5 on at least one surface of the solar cell to form a wavelength converting layer.

Assignees

• Korea Inst Sci & Tech
• Korea Inst Of Science And Techonlogy

Inventors

• Cho So-Hye
• Hwang Seung Sang
• Lee Seung Yong
• Park Jong-Ku
• Baek Kyung-Youl
• Lee Albert Sung Soo

Classifications

• H10F77/45

  Wavelength conversion means, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements · CPC title

• H10F10/00

  Individual photovoltaic cells, e.g. solar cells (electrolytic light-sensitive devices, e.g. dye-sensitised solar cells, H01G9/20) · CPC title

• C09K2211/1011

  Condensed systems · CPC title

• C09K11/7728

  containing europium · CPC title

• C09K11/7743

  containing terbium · CPC title