Photosensitive resin composition, wavelength conversion substrate and light emitting device

Patent metadata

Field	Value
Publication number	US-2017123317-A1
Application number	US-201515318034-A
Country	US
Kind code	A1
Filing date	Jun 12, 2015
Priority date	Jun 13, 2014
Publication date	May 4, 2017
Grant date	—

Abstract

A photosensitive resin composition includes a positive photosensitive resin having a photosensitive moiety that cleaves upon exposure to light, and a wavelength conversion material dispersed in the photosensitive resin. The photosensitive resin and the wavelength conversion material meet (i) to (iv):
(i) The photosensitive moiety and the cleavage product of the photosensitive resin do not neutralize the wavelength conversion material; (ii) The photosensitive moiety and the cleavage product do not induce hydrolysis of the wavelength conversion material; (iii) The HOMOs of the photosensitive moiety and the cleavage product are lower than the LUMO of the wavelength conversion material; and (iv) The LUMOs of the photosensitive moiety and the cleavage product are higher than the HOMO of the wavelength conversion material. (Any combination of a chemically amplified photosensitive resin with an acidic photosensitive moiety or cleavage product and an acidic wavelength conversion material is excluded.)

First claim

1 . A photosensitive resin composition comprising:
a positive photosensitive resin having a photosensitive moiety that cleaves upon exposure to light; and a wavelength conversion material dispersed in the photosensitive resin, wherein the photosensitive resin and the wavelength conversion material meet the following (i) to (iv): (i) the photosensitive moiety and a cleavage product of the photosensitive resin do not neutralize the wavelength conversion material; (ii) the photosensitive moiety and the cleavage product do not induce hydrolysis of the wavelength conversion material; (iii) HOMOs of the photosensitive moiety and the cleavage product are lower than a LUMO of the wavelength conversion material; and (iv) LUMOs of the photosensitive moiety and the cleavage product are higher than a HOMO of the wavelength conversion material (excluding any combination of a chemically amplified photosensitive resin with an acidic photosensitive moiety or cleavage product and an acidic wavelength conversion material).

2 . The photosensitive resin composition according to claim 1 , wherein the photosensitive moiety and the cleavage product of the photosensitive resin are neutral.

3 . The photosensitive resin composition according to claim 2 , wherein the photosensitive moiety of the photosensitive resin includes at least one selected from the group consisting of cyclobutane diimide, o-nitrobenzyl amide, o-nitrobenzyl ether, methyl phenyl carbonate, 1-benzyloxy-1-alkyl ethanol, and disilane structures.

4 . The photosensitive resin composition according to claim 3 , wherein the photosensitive moiety of the photosensitive resin is a cyclobutane diimide structure.

5 . The photosensitive resin composition according to claim 1 , wherein the wavelength conversion material has a proton-accepting or proton-donating group.

6 . The photosensitive resin composition according to claim 1 , wherein the wavelength conversion material has a dehydration-condensable group.

7 . The photosensitive resin composition according to claim 1 , wherein the wavelength conversion material has a coumarin or boron-dipyrromethene structure.

8 . The photosensitive resin composition according to claim 1 , wherein the photosensitive resin has transparency for light of a visible spectrum.

9 . The photosensitive resin composition according to claim 1 , further comprising a solvent that dissolves the photosensitive resin.

10 . A wavelength conversion substrate comprising:
a substrate; and a wavelength conversion unit provided on the substrate, wherein the wavelength conversion unit is formed from a photosensitive resin composition according to claim 1 .

11 . A light emitting device comprising:
a light source that emits excitation light; and a wavelength conversion unit that absorbs the excitation light and emits light of a wavelength different from a wavelength of the excitation light, wherein the wavelength conversion unit is formed from a photosensitive resin composition according to claim 1 .

12 . The light emitting device according to claim 11 , wherein the light emitting device includes a wavelength conversion substrate including:
a substrate; and the wavelength conversion unit provided on the substrate.

13 . The light emitting device according to claim 12 , wherein the wavelength conversion substrate includes a structural body that abuts the wavelength conversion unit on at least one side thereof and reflects or diffuses the light emitted from the wavelength conversion unit.

14 . The light emitting device according to claim 13 , wherein the structural body is formed from a material including a metallic material.

15 . The light emitting device according to claim 11 , wherein the wavelength conversion unit exhibits an internal quantum yield for light emission of 80% or more.

16 . The light emitting device according to claim 11 , wherein the wavelength conversion substrate includes multiple wavelength conversion units arranged in a matrix, and
the multiple wavelength conversion units have a density of 450 ppi or more.

Assignees

• Sharp Kk

Inventors

• Kamura Masakazu
• Iwata Akiko
• Nakano Hiroshi
• Zhang Bai
• Matsukiyo Hidetsugu
• Aomori Shigeru

Classifications

• F21V9/16

  Mechanical Engineering · mapped topic

• F21Y2115/20

  Electroluminescent [EL] light sources · CPC title

• G02B5/201

  in the form of arrays · CPC title

• G03F7/039 Primary

  Macromolecular compounds which are photodegradable, e.g. positive electron resists (G03F7/075 takes precedence; macromolecular quinonediazides G03F7/023) · CPC title

• H10F77/45

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