Abstract
The tunable excitation patterns and emission modes associated with luminescence materials, such as downshifting luminescence (DSL), upconversion luminescence (UCL), and mechanoluminescence (ML) play an important role in information encryption and anticounterfeiting. However, many reported luminescence materials usually show fixed excitation patterns and unimodal output, resulting in a low anticounterfeiting level. Therefore, developing luminescence materials with multitemporal, variation excitation patterns and multiple emission modes remains a considerable challenge, particularly in a single matrix. This study reports a highly integrated multifunctional material (color-tunable (DSL: amaranth→blue), tunable excitation patterns (250–380 nm) and quadrimodal (DSL, UCL, persistent luminescence (PersL), and ML)). The as-obtained versatile LaCaAl3O7:Eu2+/3+,Yb3+,Er3+ materials are suitable for obtaining elastomer films with the characteristics of water resistance, stretchability, and flexibility and synchronously offer multidimensional information encryptions and anticounterfeiting using common tools (ultraviolet light, near-infrared light, and pen). These results provide a unique insight into advanced multimodal anticounterfeiting.
摘要
发光材料的可调激发、发射模式(上、下转换发光)和机械发光在信息加密和防伪方面发挥着重要作用. 然而, 大多数报道的发光材料通常表现出固定的激发模式和单一的发射, 导致较低的防伪水平. 因此,开发多时态、变激发模式和多种发射模式(特别是在同一基质中)的发光材料仍然是一个重要的挑战. 本文报道了一种高度集成的多功能材料(颜色可调(下转换发光: 紫红色→蓝色), 激发模式可调(250–380 nm)和四模态(上转换、下转换、余辉和机械发光). 所制得的多功能La-CaAl3O7:Eu2+/3+,Yb3+,Er3+材料适用于合成弹性体薄膜, 该薄膜具有防水、伸缩、柔韧的特性, 利用常用工具(紫外线灯)和980 nm激光器可进行多维信息加密防伪. 这些结果为高级多模态防伪提供了独特的见解.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21871122 and 21431002) and the Fundamental Research Funds for the Central Universities (lzujbky-2021-kb17).
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Pei P designed the experiments, and wrote the first draft of the paper. Bai Y was responsible for the characterization of experimental data and guiding data analysis. Su J and Yang Y checked the grammar and format. Liu W directed the experimental design, paper writing, and revision.
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The authors declare that they have no conflict of interest.
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Experimental details and supporting data are available in the online version of the paper.
Pengxiang Pei is a PhD student at Lanzhou University. He received his bachelor degree at Qinghai Normal Uiversity in 2014 and master degree from Lanzhou Jiaotong University in 2019. His research mainly focuses on the rare-earth ions-activated long persistent phosphors and luminescent materials for anticounterfeiting.
Weisheng Liu is a professor at the College of Chemistry and Chemical Engineering, Lanzhou University. His research mainly focuses on rare-earth luminescent materials, functional complexes, fluorescent probes and detection, rubber additives.
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Achieving mechano-upconversion-downshifting-afterglow multimodal luminescence in a lanthanide-doped LaCaAl3O7 phosphor for multidimensional anticounterfeiting
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Pei, P., Bai, Y., Su, J. et al. Achieving mechano-upconversion-downshifting-afterglow multimodal luminescence in a lanthanide-doped LaCaAl3O7 phosphor for multidimensional anticounterfeiting. Sci. China Mater. 65, 2809–2817 (2022). https://doi.org/10.1007/s40843-022-2042-7
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DOI: https://doi.org/10.1007/s40843-022-2042-7