Wang Zheng, Zhu Cheng-Yi, Mo Jun-Ting, Xu Xian-Yan, Ruan Jia, Pan Mei, Su Cheng-Yong
MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China.
College of Chemistry and Chemical Engineering, Key Laboratory of Chemical Additives for China National Light Industry, Shaanxi University of Science and Technology, Xi'an, 710021, China.
Angew Chem Int Ed Engl. 2021 Feb 1;60(5):2526-2533. doi: 10.1002/anie.202012831. Epub 2020 Dec 3.
Materials with tunable long persistent luminescence (LPL) properties have wide applications in security signs, anti-counterfeiting, data encrypting, and other fields. However, the majority of reported tunable LPL materials are pure organic molecules or polymers. Herein, a series of metal-organic coordination polymers displaying color-tunable LPL were synthesized by the self-assembly of HTzPTpy ligand with different cadmium halides (X=Cl, Br, and I). In the solid state, their LPL emission colors can be tuned by the time-evolution, as well as excitation and temperature variation, realizing multi-mode dynamic color tuning from green to yellow or green to red, and are the first such examples in single-component coordination polymer materials. Single-crystal X-ray diffraction analysis and theoretical calculations reveal that the modification of LPL is due to the balanced action from single molecule and aggregate triplet excited states caused by an external heavy-atom effect. The results show that the rational introduction of different halide anions into coordination polymers can realize multi-color LPL.
具有可调谐长余辉发光（LPL）特性的材料在安全标志、防伪、数据加密等领域有着广泛的应用。然而，大多数已报道的可调谐LPL材料是纯有机分子或聚合物。在此，通过HTzPTpy配体与不同卤化镉（X = Cl、Br和I）的自组装合成了一系列呈现颜色可调谐LPL的金属有机配位聚合物。在固态下，它们的LPL发射颜色可以通过时间演化以及激发和温度变化进行调节，实现从绿色到黄色或从绿色到红色的多模式动态颜色调节，并且是单一组分配位聚合物材料中的首例此类实例。单晶X射线衍射分析和理论计算表明，LPL的改性是由于外部重原子效应引起的单分子和聚集三重态激发态的平衡作用。结果表明，在配位聚合物中合理引入不同的卤化物阴离子可以实现多色LPL。
