Quantum-dot containing resin sheet or film, method for producing the same, and wavelength conversion member

Patent metadata

Field	Value
Publication number	US-12365829-B2
Application number	US-202418410598-A
Country	US
Kind code	B2
Filing date	Jan 11, 2024
Priority date	Oct 16, 2017
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A wavelength conversion member, for a backlight, is provided. The wavelength conversion member includes a stack of a plurality of resin layers, with at least one of the plurality of resin layers containing quantum dots. The plurality of resin layers is integrally molded through co-extrusion, and forms a three-layer structure comprising a middle layer containing the quantum dots and upper and lower layers that do not contain the quantum dots. The upper layer and the lower layer are respectively on an upper side and a lower side of the middle layer. The upper and lower layers each contain a light scattering agent. Each of the plurality of resin layers is directly joined together with a bonding layer at an interface between the middle layer and the upper layer and not at an interface between the middle layer and the lower layer.

First claim

What is claimed is:

1. A wavelength conversion member, for a backlight, comprising:
a stack of a plurality of resin layers, at least one of the plurality of resin layers containing quantum dots,
wherein the plurality of resin layers is integrally molded through co-extrusion,
wherein the plurality of resin layers form a three-layer structure comprising a middle layer containing the quantum dots, and an upper layer and a lower layer that do not contain the quantum dots, the upper layer and the lower layer being respectively on an upper side and a lower side of the middle layer,
wherein the upper layer and the lower layer each contain a light scattering agent, and
wherein each of the plurality of resin layers is directly joined together without a bonding layer at an interface between the middle layer and the upper layer nor at an interface between the middle layer and the lower layer.

2. The wavelength conversion member according to claim 1 , wherein a first resin layer containing the quantum dots and a second resin layer not containing the quantum dots are integrally molded.

3. The wavelength conversion member according to claim 2 , wherein the second resin layer not containing the quantum dots contains a functional additive.

4. The wavelength conversion member according to claim 1 , wherein the quantum dots include at least green-light emitting quantum dots and red-light emitting quantum dots.

5. The wavelength conversion member according to claim 1 , wherein each of the plurality of resin layers contains amorphous resin.

6. The wavelength conversion member according to claim 1 , wherein a total thickness of the plurality of resin layers is greater than or equal to 50 μm and less than or equal to 500 μm.

7. The wavelength conversion member according to claim 1 , wherein each of a first ratio of a peak green light intensity of the wavelength conversion member to a peak blue light intensity of the wavelength conversion member, and a second ratio of a peak red light intensity of the wavelength conversion member to the peak blue light intensity of the wavelength conversion member is greater than or equal to 0.3.

8. The wavelength conversion member according to claim 1 , wherein a full width at half maximum of fluorescence of each of a blue light intensity of the wavelength conversion member, a green light intensity of the wavelength conversion member, and a red light intensity of the wavelength conversion member is less than or equal to 100 nm.

Assignees

• Ns Mat Inc
• Toppan Inc

Inventors

• Iida Kazunori
• Tsutsumi Emi
• Niwaki Mika
• Kaneno Jun
• Nikata Soichiro
• Tanaka Hidetoshi

Classifications

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J2345/00

  Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers · CPC title

• C08J2333/04

  esters · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title