Phosphor-containing film and backlight unit

Patent metadata

Field	Value
Publication number	US-11136496-B2
Application number	US-201916287256-A
Country	US
Kind code	B2
Filing date	Feb 27, 2019
Priority date	Sep 2, 2016
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

A phosphor-containing film contains a phosphor such as a quantum dot and is capable of suppressing deterioration of phosphor even where the film is formed into a laminated structure; and a backlight unit including the phosphor-containing film as a wavelength converting member. The film includes: a phosphor-containing layer in which a plurality of fluorescent regions, each of which contains a phosphor that deteriorates through reaction with oxygen when exposed to oxygen, are discretely arranged and a resin layer having impermeability to oxygen is arranged among the plurality of the discretely arranged fluorescent regions; and a first substrate film and a second substrate film, which are respectively laminated on both main surfaces of the phosphor-containing layer, in which the resin layer has a Knoop hardness of 115 N/mm2 to 285 N/mm2, a creep recovery rate of 22% or less, and an elastic recovery rate of 60% or more.

First claim

What is claimed is:

1. A phosphor-containing film comprising:
a phosphor-containing layer in which a plurality of fluorescent regions, each of which contains a phosphor that deteriorates through a reaction with oxygen in the case of being exposed to oxygen, are discretely arranged and a resin layer having impermeability to oxygen is arranged among the plurality of discretely arranged fluorescent regions; and
a first substrate film laminated on one main surface of the phosphor-containing layer and a second substrate film laminated on the other main surface of the phosphor-containing layer,
in which the resin layer has a Knoop hardness of 115 N/mm 2 to 285 N/mm 2 , a creep recovery rate of 22% or less, and an elastic recovery rate of 60% or more,
wherein each of the fluorescent regions is formed by dispersing the phosphor in a binder, and
wherein each of the fluorescent regions containing the phosphor in which properties of the fluorescence deteriorate, and the resin layer, are exposed on an end face of the phosphor-containing film.

2. The phosphor-containing film according to claim 1 , wherein the resin layer has an oxygen permeability of 10 cc/(m 2 ·day·atm) or less.

3. The phosphor-containing film according to claim 1 , wherein the oxygen permeability of the first substrate film and the second substrate film is 1 cc/(m 2 ·day·atm) or less.

4. The phosphor-containing film according to claim 1 , wherein a resin contained in the resin layer is formed of a composition containing a compound having a photopolymerizable functional group or a thermopolymerizable functional group.

5. A backlight unit comprising:
a wavelength converting member including the phosphor-containing film according to claim 1 ; and
at least one of a blue light emitting diode or an ultraviolet light emitting diode.

Assignees

• Fujifilm Corp

Inventors

• Sekiguchi Megumi
• Oba Tatsuya
• Kakishita Kenichi
• Kusumoto Masayuki
• Chikushi Natsuru

Classifications

• H10H20/851

  Wavelength conversion means · CPC title

• C09K11/56

  containing sulfur · CPC title

• G02B5/201

  in the form of arrays · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• F21S2/00

  Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction · CPC title