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-2016200939-A1
Application number	US-201514613789-A
Country	US
Kind code	A1
Filing date	Feb 4, 2015
Priority date	Jan 8, 2015
Publication date	Jul 14, 2016
Grant date	—

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 curable coating composition comprising 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, and m and n are an integer of 1 to 10,000.

2 . The coating composition of claim 1 , wherein a ratio of m to n is in a range of 1:9 to 9:1.

3 . The coating composition of claim 2 , wherein the ratio of m to n is in a range of 6:4.

4 . The coating composition of claim 1 , wherein the polyorgano-silsesquioxane has a number average molecular weight in a range of 10 2 to 10 6 .

5 . The coating composition of claim 1 , wherein the wavelength converting agent comprises at least one selected from the group consisting of a lanthanide compound, a transition metal compound, an organic dye and a semiconductor nanocrystal.

6 . The coating composition of claim 5 , wherein the lanthanide compound or transition metal compound is a compound comprising at least one metal selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Mo, Ru, Rh, Ag, Cd, Ir, W, Au and Hg.

7 . The coating composition of claim 5 , wherein the organic dye comprises one or more selected from the group consisting of organic monomers comprising aromatic, alicyclic, ether, halogenated hydrocarbon or terphenyl functional groups, and polymers or combinations thereof.

8 . The coating composition of claim 5 , wherein the semiconductor nanocrystal comprises one or more semiconductor nanocrystals selected from the group consisting of CdTe/CdSe, CdS(Se)/CdTe, CdS(Se)/ZnTe, CuInS(Se)/ZnS(Se), Cu(GaIn)S(Se)/ZnS(Se), ZnTe/CdS(Se), GaSb/GaAs, GaAs/GaSb, Ge/Si, Si/Ge, PbSe/PbTe, PbTe/PbSe, CdTe, CdSe, ZnTe, CuInS, CuGaS, Cu(Ga,In)S, CuGaSnS(Se), CuGaS(Se), CuSnS(Se), ZnS, CuInSe, CuGaSe, ZnSe, ZnTe, GaSb, GaAs, Ge, Si, PbSe, PbTe, PbTe and PbSe.

9 . The coating composition of claim 1 , wherein the coating composition further comprises a curing catalyst, a binder, a metal particle, or a spherical particle.

10 . The coating composition of claim 9 , wherein a total content of the curing catalyst, the binder, the metal particle, or the spherical particle is 0.0001 to 10 wt % in the entire coating composition.

11 . The coating composition of claim 1 , wherein a transmittance of the coating composition is 70% or more compared to that of an aqueous solution.

12 . A method for preparing a wavelength converting sheet, comprising the steps of: (a) applying the coating composition of claim 1 on a substrate; and (b) curing the applied substrate.

13 . The method of claim 12 , wherein the substrate comprises plastic, stainless steel, aluminum, glass, quartz, a solar cell, an LED chip or a fiber.

14 . The method of claim 12 , wherein the sheet has a visible light transmittance of 70% or more compared to that of the air.

15 . The method of claim 12 , further comprising patterning a surface of the prepared sheet.

16 . The method of claim 12 , further comprising applying a polyorgano-silsesquioxane protective layer.

17 . A wavelength converting sheet prepared according to the method of claim 12 .

18 . The sheet of claim 17 , 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.

19 . A solar cell comprising the wavelength converting sheet of claim 17 .

20 . A method for preparing a solar cell, comprising the steps of: (a) preparing a solar cell; and (b) applying the coating composition of claim 1 on at least one surface of the solar cell, and curing the surface thereof to form a wavelength converting layer.

Assignees

• Korea Inst Sci & Tech

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

• H10F77/315

  the coatings being antireflective or having enhancing optical properties · CPC title

• C09K2211/188

  of other metals not provided for in one of the previous groups · CPC title

• C09K2211/182

  of the rare earth metals, i.e. Sc, Y or lanthanide · CPC title