Color-Tunable Dual-Mode Organic Afterglow from Classical Aggregation-Caused Quenching Compounds for White-Light-Manipulated Anti-Counterfeiting |
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| Authors: | Yaohui Liang Prof. Chao Xu Huaqing Zhang Shiying Wu Jian-An Li Yifan Yang Dr. Zhu Mao Prof. Suilian Luo Prof. Cong Liu Prof. Guang Shi Prof. Fengqiang Sun Prof. Zhenguo Chi Prof. Bingjia Xu |
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| Affiliation: | 1. School of Chemistry, Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, South China Normal University, Guangzhou, 510006 China;2. School of Environment, South China Normal University, Guangzhou, 510006 China;3. Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China;4. School of Chemistry, Sun Yat-sen University, Guangzhou, 510275 China |
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| Abstract: | Color-tunable dual-mode organic afterglow excited by ultraviolet (UV) and white light was achieved from classical aggregation-caused quenching compounds for the first time. Specifically, two luminescent systems, which could produce significant organic afterglow composed of persistent thermally activated delayed fluorescence and ultralong organic phosphorescence under ambient conditions, were constructed by doping fluorescein sodium and calcein sodium into aluminum sulfate. Their lifetimes surpassed 600 ms, and the dopant concentrations were as low as 5×10−6 wt %. Moreover, the persistent luminescence colors of the materials could be tuned from blue to green and then to yellow by simply varying the concentrations of guest compounds or the temperature in the range of 260–340 K. Inspired by these exciting results, the afterglow materials were used for UV- and white-light-manipulated anti-counterfeiting and preparation of elastomers with different colors of persistent luminescence. |
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| Keywords: | Afterglow Aggregation-Caused Quenching Anti-Counterfeiting Phosphorescence Thermally Activated Delayed Fluorescence |
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