Abstract
In recent years, upconversion luminescent materials doped with rare-earth ions have been widely used in anti-counterfeiting applications. However, in practical applications, single-mode photoluminescence is difficult to meet the increasingly complex anti-counterfeiting requirements of today’s society. In this article, dual-mode-excited, dual-color emitting Yb3+/Er3+ co-doped Bi4TaO8Cl nano-phosphor has been successfully synthesized via the one-step molten salt method. Bi4TaO8Cl: Yb3+/Er3+ nano-phosphor can emit green and red luminescence under 980 nm excitation, and the emission color changes from green to red by controlling the dopant concentration; whereas under 1550 nm excitation, it is mainly a single band red emission. The multicolor emission improves the security of multimode anticounterfeiting. The possible UC mechanisms were investigated under different excitation light sources at 980 and 1550 nm. Meanwhile, the anti-counterfeiting properties of the prepared nano-phosphor were evaluated according to the luminous intensity ratio of red and green light. The results demonstrate that Bi4TaO8Cl: Yb3+/Er3+ nano-phosphor will be expected to have excellent applications in the field of multimode anticounterfeiting.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 12264023), the National Natural Science Foundation of High and Foreign Experts Introduction Plan (No. G2022039008L), the Yunnan Major Scientific and Technological Projects (No. 202202AG050016), the Yunnan Fundamental Research Projects (No. 202301AT070459), and Yunnan XingDian Youth Talent Support Program (No. XDYC-QNRC-2022-0591). We also thank Shiyanjia Lab (https://www.shiyanjia.com) for the SEM test.
Funding
This work was supported by the National Natural Science Foundation of China (No. 12264023), the National Natural Science Foundation of High and Foreign Experts Introduction Plan (No. G2022039008L), the Yunnan Major Scientific and Technological Projects (No. 202202AG050016), the Yunnan Fundamental Research Projects (No. 202301AT070459), and Yunnan XingDian Youth Talent Support program (No. XDYC-QNRC-2022-0591).
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LX: Writing—original draft, conceptualization, methodology, software, investigation. YW: Methodology, formal analysis, writing— original draft. YL: Funding acquisition, supervision, validation, writing—review & editing. ZY and QW: Formal analysis. JH: Conceptualization. ZY and JQ: Supervision, validation. ZS: Funding acquisition, supervision.
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Xu, L., Wei, Y., Li, Y. et al. Anticounterfeiting application of Bi4TaO8Cl: Yb3+/Er3+ nano-phosphor designed by molten salt method for dual-mode upconversion luminescence. J Mater Sci: Mater Electron 34, 1564 (2023). https://doi.org/10.1007/s10854-023-10993-8
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DOI: https://doi.org/10.1007/s10854-023-10993-8