A Diverse Color-tunable Luminous Polyurethane Leather Coating Based on Long Persistent Phosphors and Photochromatic Spiropyrans

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Saiqi Tian
Zhe Sun
Haojun Fan
Yi Chen
Jun Yan

Abstract

A diverse color-tunable luminous polyurethane leather coating(CLPU) which can reversibly change color as well as fluorescentemission through the UV-vis or UV-darkness circle wasprepared, via covalent incorporation of amino-functionalizedphosphors and photochromic 1-(2-Hydroxyethyl)-3,3-Dimethylindolino-6’-nitrobenzopyrylospiran (SP). X-RayDiffraction (XRD), X-ray photoelectron spectroscopy (XPS),UV-vis absorption spectra, reflectance spectra, fluorescentspectra as well as the migration percentage were measured tocharacterize the resultant samples structure and properties. Indaylight, CLPU appears white before 365 UV irradiation and violetafter UV irradiation, due to the transition of the spiro forms ofspiropyran to merocyanine forms. In darkness, CLPU emitsintense green light before UV irradiation, and the light changesto orange after UV irradiation, due to the phosphors showingpleasant diverse color-tunable luminous effect.

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