Wavelength conversion sheet film, wavelength conversion sheet, backlight and display device

Abstract

This invention provides a wavelength conversion sheet film that exhibits superior adhesion to the phosphor layer during the fabrication of wavelength conversion sheets. The wavelength conversion sheet film is formed by laminating at least a substrate layer and a base layer. The base layer contains a cured resin composition comprising a polyurethane resin and a silane coupling agent. When analyzing the intensity of SiOH+ along the thickness direction of the base layer from the surface opposite to the substrate layer using TOF-SIMS, the average intensity of SiOH+ in the region up to 7 nm from the surface of the base layer is defined as I1, the average intensity of SiOH+ in the region exceeding 7 nm but less than 19 nm from the surface is defined as I2, and the average intensity of SiOH+ in the region exceeding 37 nm but less than 47 nm from the surface is defined as I3. In this case, I1 / I3 is 7.5 or higher, and I2 / I3 is 2.5 or lower.

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