<br>Bi3+ 单掺杂 LiGa5O8 中的长时间红色持续发光：通过位点选择性占据调节陷阱,Inorganic Chemistry

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Bi3+ 单掺杂 LiGa5O8 中的长时间红色持续发光：通过位点选择性占据调节陷阱
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2023-11-16 , DOI: 10.1021/acs.inorgchem.3c02720
Zishuo Yi ₁ , Peng Liu ₁ , Xia Liu ₁ , Yan Xu _{1,

2}

Affiliation

持久发光（PersL）材料具有令人印象深刻的光学性能优势，在信息加密应用中显示出巨大的潜力。本文中，通过简单的固态反应容易地合成Bi ³⁺掺杂的LiGa ₅ O ₈ PersL材料。 Bi ³⁺离子在LiGa ₅ O ₈中不同的Ga ³⁺和Li ⁺多面体位点上的位点选择性和优先占据使其在254 nm的UV激发下具有511和718 nm的双峰发射。移除光源后，由于产生了更多更深的陷阱，被分类为氧空位缺陷（V _O ^•• ）和杂质缺陷（Bi _Li ^•• ），观察到强烈的红色余辉。在无机荧光粉中实现Bi ³⁺单掺杂激活红色PersL的报道很少。 LiGa ₅ O ₈ : x % Bi ³⁺ （ x = 0.5–5.0）样品还表现出可调的 PL 和时间依赖性 PersL 特性。结合莫尔斯电码，设计了基于LiGa ₅ O ₈ : x %Bi ³⁺ ( x =0、0.5、5.0)样品异常光学特性的多重信息加密模型，实现高水平动态防伪。这些成果进一步验证了使用Bi ³⁺单一掺杂策略来探索优异的PersL材料并扩展其多功能光学应用。

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Prolonged Red Persistent Luminescence in Bi3+ Single-Doped LiGa5O8: Regulating Traps by Site Selective Occupation

Persistent luminescence (PersL) materials with impressive superiorities in optical performance have shown tremendous potential for information encryption application. Herein, a Bi³⁺-doped LiGa₅O₈ PersL material is facilely synthesized by a simple solid-state reaction. Site selective and preferential occupation of Bi³⁺ ions at distinct Ga³⁺ and Li⁺ polyhedra sites in LiGa₅O₈ endows it with a bimodal emission at 511 and 718 nm upon UV excitation at 254 nm. After removing the light source, an intense red afterglow was observed due to the generation of more and deeper traps classified as the oxygen vacancy defect (V_O^••) and the impurity defect (Bi_Li^••). It is rarely reported in inorganic phosphors to achieve the Bi³⁺ single doping-activated red PersL. The LiGa₅O₈:x% Bi³⁺ (with x = 0.5–5.0) samples also exhibit tunable PL and time-dependent PersL properties. Combined with the Morse Code, a multiple information encryption model based on the abnormal optical properties of LiGa₅O₈:x% Bi³⁺ (x = 0, 0.5, and 5.0) samples was designed for high-level dynamic anticounterfeiting. These achievements further validate the use of the Bi³⁺ single doping strategy to explore excellent PersL materials and expand their multifunctional optical applications.

更新日期：2023-11-16

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