Breaking the balance of chemical ratio in ZnAl2O4 to regulate activators and traps for multimode luminescence - A new strategy

H. Yang; G. Shen; S. Tang; J.-G. Li; Q. Zhu

doi:10.1016/j.mtchem.2023.101663

Article Breaking the balance of chemical ratio in ZnAl2O4 to regulate activators and traps for multimode luminescence - A new strategy

H. Yang ; G. Shen ; S. Tang ; J.-G. Li (National Institute for Materials Science) ; Q. Zhu

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H. Yang, G. Shen, S. Tang, J.-G. Li, Q. Zhu. Breaking the balance of chemical ratio in ZnAl2O4 to regulate activators and traps for multimode luminescence - A new strategy. Materials Today Chemistry. 2023, 32 (), 101663-101663. https://doi.org/10.1016/j.mtchem.2023.101663

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The spinel-structured ZnAl2O4 phosphors with deficiency of zinc were synthesized by high-temperature solid-state reaction, which were characterized by a series of techniques, including XRD, DFT calculation, PLE/PL spectroscopy, TL, persistent luminescence decay curves, and temperature-dependent PL spectra analysis. The deficiency of zinc results in the appearance of zinc vacancy (VZn) and oxygen vacancy (VO), and the increased oxygen vacancy defects inhibit the self-reduction of Mn4+. Under the excitation of 325 nm and 426 nm ultraviolet light, the phosphor showed green emission at 510 nm, red emission at 678 nm, and near-infrared emission at 767 nm. Due to the increase of vacancy defects, the higher concentration of zinc deficiency leads to stronger emission of green light, red light, and near-infrared light. The phosphor exhibited different light signals at different excitation wavelengths, and the thermal stability of Mn2+ and Mn4+ luminescence is inconsistent. The above characteristics show that the multimode luminescent phosphor synthesized in this work has broad application prospects in the field of fluorescence anti-counterfeiting.

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