Phosphor-containing film and backlight unit

Abstract

A phosphor-containing film including a phosphor such as a quantum dot and is capable of suppressing the deterioration of the 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 the both main surfaces 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.

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, and   the resin layer contains a compound having the same polymerizable crosslinking group as that of the fluorescent region.   
     
     
         2 . The phosphor-containing film according to  claim 1 , wherein the curable compound forming the resin layer having impermeability to oxygen contains inorganic particles. 
     
     
         3 . The phosphor-containing film according to  claim 2 , wherein the inorganic particles are at least one selected from the group consisting of silica particles, alumina particles, zirconium oxide particles, zinc oxide particles, titanium oxide particles, mica, and talc. 
     
     
         4 . The phosphor-containing film according to  claim 3 , wherein the inorganic particles are plate-like, and an aspect ratio of the inorganic particles is 20 or more and 500 or less. 
     
     
         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.   
     
     
         6 . A backlight unit comprising:
 a wavelength converting member including the phosphor-containing film according to  claim 4 ; and   at least one of a blue light emitting diode or an ultraviolet light emitting diode.