Phosphor-containing film and backlight unit
Provided are a phosphor-containing capable of suppressing deterioration of phosphors and can be manufactured with high efficiency and a backlight unit. Specifically, provided is a phosphor-containing film 1 , including a first substrate film 10 ; and a phosphor-containing layer 30 at which a plurality of regions 35 containing phosphors 31 , which, if exposed to oxygen, deteriorate by reacting with the oxygen, are discretely disposed on the first substrate film 10 , and at which a resin layer 38 having an impermeability to oxygen is disposed between the discretely disposed regions 35 containing phosphors 31 , in which a width S of the resin layer 38 between the regions 35 containing phosphors 31 is 0.01≤S<0.5 mm, and wherein a ratio of a volume Vp of the regions containing phosphors, to a sum of the volume Vp and a volume Vb of the resin layer in the phosphor-containing layer, is 0.1≤Vp/(Vp+Vb)<0.9.
1. A phosphor-containing film, comprising:
a first substrate film; and
a phosphor-containing layer at which a plurality of regions containing phosphors, which, if exposed to oxygen, deteriorate by reacting with the oxygen, are discretely disposed on the first substrate film, and at which a resin layer having an impermeability to oxygen is disposed between the plurality of discretely disposed regions containing phosphors,
wherein a width S of the resin layer between the regions containing phosphors is 0.01≤S<0.5 mm, and
wherein a ratio of a volume Vp of the regions containing the phosphors, to a sum of the volume Vp and a volume Vb of the resin layer in the phosphor-containing layer, is 0.1≤Vp/(Vp+Vb)<0.9.
2. The phosphor-containing film according to claim 1 , wherein an oxygen permeability of the resin layer is 10 cc/(m 2 ·day·atm) or less.
3. The phosphor-containing film according to claim 1 , wherein an oxygen permeability of the first substrate film is 10 cc/(m 2 ·day·atm) or less.
4. The phosphor-containing film according to claim 1 , wherein the width S of the resin layer between the regions containing phosphors is 0.01≤S<0.2 mm.
5. The phosphor-containing film according to claim 1 , wherein a resin contained in the resin layer is a cured product of a composition containing light-scattering particles and a compound having a photo- or heat-polymerizable functional group.
6. The phosphor-containing film according to claim 5 , wherein the compound having a photo- or heat-polymerizable functional group comprises a (meth)acrylate compound.
7. The phosphor-containing film according to claim 6 , wherein the (meth)acrylate compound comprises a monofunctional (meth)acrylate compound and a polyfunctional (meth)acrylate compound, wherein a compounding ratio of the monofunctional (meth)acrylate compound to the polyfunctional (meth)acrylate compound is from 80/20 to 0/100 in terms of weight ratio.
8. The phosphor-containing film according to claim 5 , wherein the compound having a photo- or heat-polymerizable functional group comprises a compound containing a substituent having an aromatic structure, an alicyclic hydrocarbon structure, or a combination thereof.
9. The phosphor-containing film according to claim 5 , wherein the compound having a photo- or heat-polymerizable functional group comprises:
a (meth)acrylate compound having an aromatic structure, an alicyclic hydrocarbon structure, or a combination thereof; and
a (meth)acrylate compound containing a fluorine atom.
10. The phosphor-containing film according to claim 5 , wherein the compound having photo- or heat-polymerizable functional group comprises a compound having an epoxy group or an oxetanyl group, and a (meth)acrylate compound.
11. The phosphor-containing film according to claim 1 , further comprising:
a second substrate film disposed opposite to the first substrate film with the phosphor-containing layer being interposed therebetween.
12. The phosphor-containing film according to claim 11 , wherein an oxygen permeability of the second substrate film is 10 cc/(m 2 ·day·atm) or less.
13. A backlight unit, comprising:
a wavelength converting member formed of the phosphor-containing film according claim 1 ; and
a blue light emitting diode or ultraviolet light emitting diode.