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Article Abstract
Low-temperature anticounterfeiting technologies play a crucial role in ensuring the authenticity and integrity of temperature-sensitive products such as vaccines, pharmaceuticals, and food items. In this work, a low-temperature anticounterfeiting route based on the differentiated photoluminescence (PL), PersL, and thermally stimulated luminescence (TSL) behaviors of metal halide perovskite, pure CsCdCl, and CsCdCl:10% Te is proposed. The CsCdCl host exhibits pronounced color shifts, encompassing PL, PersL, and TSL behaviors, ranging from blue to yellow and orange as the temperature rises from 100 K to room temperature. This color change is attributed to a change in the luminous center (from the D octahedron to the C octahedron). Conversely, the addition of Te as the luminescence center inhibits the matrix emission, maintains the characteristic orange emission of Te, and regulates the trap distribution of the matrix at low temperature and the TL luminescence intensity. This work highlights the significant promise of CsCdCl:10% Te and CsCdCl phosphors as innovative low-temperature anticounterfeiting technologies, especially for cold-chain vaccine safety monitoring.
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