Dynamic color-tunable ultra-long room temperature phosphorescence polymers with photo-chromism and water-stimuli response for multilevel anti-counterfeiting
Xiao Ma , Tian-Jiao Ye , Han-Jiang Yang , Guang-Kun Ling , Danfeng Wang , Jia-Shu Li , Peiyang Gu , Liang-Jin Xu , Tian-Lu Sheng , Fu-Rong Lin , Run-Fu Shen , Qichun Zhang
Aggregate ›› 2024, Vol. 5 ›› Issue (5) : e579
Dynamic color-tunable ultra-long room temperature phosphorescence polymers with photo-chromism and water-stimuli response for multilevel anti-counterfeiting
Developing dynamic color-tunable ultra-long room temperature phosphorescence (URTP) polymers with afterglow of over 1 s, photo-chromism, and multi-stimuli response for practical anti-counterfeiting and information security applications is attractive but very challenging. Herein, by doping multicolor phosphorescence pyridinium bromide L block or viologen-based photo-chromic V block into polyvinyl alcohol matrixes, the water-stimuli-responsive color-tunable URTP polymer films with afterglow of up to 8 s and the reversible viologen-based photochromic polymer films have been developed. More significantly, a series of dynamic color-tunable URTP polymer films with ultra-long afterglow of over 6 s, photo-chromism, and water-stimuli response have been successfully exploited by integrating L and V blocks into one polymer system. Mechanistic investigations have revealed that their photo-chromism mainly comes from the photo-generated viologen free radicals. Furthermore, their dynamic multilevel anti-counterfeiting applications have been demonstrated. These results pave the way to develop smarter multifunctional URTP materials for anti-counterfeiting and optical sensing.
anti-counterfeiting / phosphorescence / photochromism / stimuli response / ultralong viologen
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2024 The Author(s). Aggregate published by SCUT, AIEI, and John Wiley & Sons Australia, Ltd.
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