Wavelength conversion member, backlight unit including wavelength conversion member, liquid crystal display device, and method of manufacturing wavelength conversion member

Patent metadata

Field	Value
Publication number	US-10513655-B2
Application number	US-201715660333-A
Country	US
Kind code	B2
Filing date	Jul 26, 2017
Priority date	Feb 2, 2015
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

Provided is a wavelength conversion member including: a wavelength conversion layer including at least one kind of quantum dots that are excited by excitation light to emit fluorescence and are dispersed in an organic matrix; and a barrier layer that is provided adjacent to at least one main surface of the wavelength conversion layer and includes silicon nitride and/or silicon oxynitride as a major component, in which the organic matrix is obtained by curing a curable composition including at least an alicyclic epoxy compound and includes a chemical structure A which is bonded to silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

First claim

What is claimed is:

1. A wavelength conversion member comprising:
a wavelength conversion layer including at least one kind of quantum dots that are excited by excitation light to emit fluorescence and are dispersed in an organic matrix; and
a barrier layer that is provided adjacent to at least one main surface of the wavelength conversion layer and includes silicon nitride and/or silicon oxynitride as a major component,
wherein the organic matrix is obtained by curing a curable composition including at least an alicyclic epoxy compound and includes a chemical structure A which is bonded to silicon nitride and/or silicon oxynitride as a major component of the barrier layer,
wherein the chemical structure A is bonded to the organic matrix through a chemical structure B, and
wherein the chemical structure B forms a covalent bond with the organic matrix.

2. The wavelength conversion member according to claim 1 ,
wherein the chemical structure A forms a covalent bond with silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

3. The wavelength conversion member according to claim 1 ,
wherein the chemical structure A forms a hydrogen bond with silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

4. The wavelength conversion member according to claim 2 ,
wherein the chemical structure A forms a siloxane bond with silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

5. The wavelength conversion member according to claim 3 ,
wherein the chemical structure A forms a hydrogen bond based on at least one of an amino group, a mercapto group, or a urethane structure with silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

6. The wavelength conversion member according to claim 1 ,
wherein the chemical structure B forms a covalent bond based on at least one of an amino group, a mercapto group, or an epoxy group with the organic matrix.

7. The wavelength conversion member according to claim 1 ,
wherein the barrier layer includes silicon nitride as a major component.

8. The wavelength conversion member according to claim 1 ,
wherein the alicyclic epoxy compound is an alicyclic epoxy compound I represented by the following formula,

9. The wavelength conversion member according to claim 1 ,
wherein the wavelength conversion layer is formed by curing a quantum dot-containing curable composition including the quantum dots, the alicyclic epoxy compound, and a compound which is bonded to silicon nitride and/or silicon oxynitride as a major component of the barrier layer to form the chemical structure A.

10. The wavelength conversion member according to claim 9 ,
wherein the compound which forms the chemical structure A further forms the chemical structure B with the organic matrix.

11. A backlight unit comprising:
a surface light source that emits primary light;
the wavelength conversion member according to claim 1 that is provided on the surface light source;
a retroreflecting member that is disposed to face the surface light source with the wavelength conversion member interposed therebetween; and
a reflection plate that is disposed to face the wavelength conversion member with the surface light source interposed therebetween,
wherein the wavelength conversion member is excited by excitation light, which is at least a portion of the primary light emitted from the surface light source, to emit the fluorescence and emits at least light which includes secondary light including the fluorescence.

12. A liquid crystal display device comprising:
the backlight unit according to claim 11 ; and
a liquid crystal cell unit that is disposed to face the retroreflecting member side of the backlight unit.

Assignees

• Fujifilm Corp

Inventors

• Satake Ryo
• Kamo Makoto
• Yamada Naoyoshi
• Oba Tatsuya

Classifications

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• G02B5/12

  Reflex reflectors · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02F2201/50

  Protective arrangements · CPC title