Laminate, wavelength conversion member, backlight unit, and image display device
A laminate, comprising an intermediate layer and a covering material A and a covering material B that are disposed on respective sides of the intermediate layer, the covering material A being disposed with an orientation direction at an angle of 20° or less with respect to an orientation direction of the covering material B.
1. A laminate, comprising an intermediate layer, which is a cured product obtained by exposure to an active energy ray, and a covering material A and a covering material B that are disposed on respective sides of the intermediate layer, the covering material A being disposed with an orientation direction at an angle of 20° or less with respect to an orientation direction of the covering material B.
2. The laminate according to claim 1 , wherein each of the covering material A and the covering material B has a multilayer structure.
3. The laminate according to claim 1 , wherein at least one of the covering material A or the covering material B has a water vapor transmission rate, at 40° C. and a relative humidity of 90%, of 1×10 −1 g/(m 2 ·day) or less.
4. The laminate according to claim 1 , wherein at least one of the covering material A or the covering material B has an oxygen transmission rate, at 30° C. and a relative humidity of 70%, of 1 cm 3 /(m 2 ·day·atm) or less.
5. A wavelength conversion member, comprising a wavelength conversion layer, which is a cured product obtained by exposure to an active energy ray, and a covering material A and a covering material B that are disposed on respective sides of the wavelength conversion layer, the covering material A being disposed with an orientation direction at an angle of 20° or less with respect to an orientation direction of the covering material B.
6. The wavelength conversion member according to claim 5 , wherein each of the covering material A and the covering material B has a multilayer structure.
7. The wavelength conversion member according to claim 5 , wherein at least one of the covering material A or the covering material B has a water vapor transmission rate, at 40° C. and a relative humidity of 90%, of 1×10 −1 g/(m 2 ·day) or less.
8. The wavelength conversion member according to claim 5 , wherein at least one of the covering material A or the covering material B has an oxygen transmission rate, at 30° C. and a relative humidity of 70%, of 1 cm 3 /(m 2 ·day·atm) or less.
9. The wavelength conversion member according to claim 5 , wherein the wavelength conversion layer is a cured product of a composition comprising a wavelength conversion material, a polymerizable compound and a photolymerization initiator.
10. The wavelength conversion member according to claim 9 , wherein the polymerizable compound comprises a thiol compound and at least one selected from the group consisting of a (meth)allyl compound and a (meth)acrylic compound.
11. The wavelength conversion member according to claim 9 , wherein the wavelength conversion material comprises a quantum dot phosphor.
12. A backlight unit, comprising the wavelength conversion member according to claim 5 and a light source.
13. An image display device, comprising the backlight unit according to claim 12 .