Abstract
Room-temperature phosphorescence (RTP) with a dynamic feature endows organic luminescent materials with promising application in optoelectronic fields. However, it remains a formidable challenge to obtain dynamic RTP materials. Herein, we reported a strategy for dynamic RTP via reversible transformation of radicals under external stimuli. RTP gradually disappeared with continuous UV-light irradiation owing to the conversion of NDIA to NDIA·− in NDIA/PVA film, which can be recovered by oxidation with oxygen. Regarding the excellent reversibility and repeatability, the potential applications for round-the-clock anti-counterfeiting and tag were first demonstrated. This finding not only outlines a principle to synthesize new RTP materials with dynamic behavior, but also expands the scope of applications of dynamic RTP materials.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2020YFA0709900), the National Natural Science Foundation of China (21975120, 62134007, 21875104, 21973043), Talented of Nanjing Tech University (201983), Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21-1101), and China National Postdoctoral Program for Innovative Talents (BX20200278).
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Yao, X., Shi, H., Wang, X. et al. Dynamic room-temperature phosphorescence by reversible transformation of photo-induced free radicals. Sci. China Chem. 65, 1538–1543 (2022). https://doi.org/10.1007/s11426-022-1255-1
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DOI: https://doi.org/10.1007/s11426-022-1255-1