Yi Zishuo, Liu Peng, Liu Xia, Xu Yan
Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, PR China.
Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China.
Inorg Chem. 2023 Dec 4;62(48):19542-19551. doi: 10.1021/acs.inorgchem.3c02720. Epub 2023 Nov 16.
Persistent luminescence (PersL) materials with impressive superiorities in optical performance have shown tremendous potential for information encryption application. Herein, a Bi-doped LiGaO PersL material is facilely synthesized by a simple solid-state reaction. Site selective and preferential occupation of Bi ions at distinct Ga and Li polyhedra sites in LiGaO 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) and the impurity defect (Bi). It is rarely reported in inorganic phosphors to achieve the Bi single doping-activated red PersL. The LiGaO:% Bi (with = 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 LiGaO:% Bi ( = 0, 0.5, and 5.0) samples was designed for high-level dynamic anticounterfeiting. These achievements further validate the use of the Bi single doping strategy to explore excellent PersL materials and expand their multifunctional optical applications.
具有出色光学性能优势的持久发光（PersL）材料在信息加密应用中显示出巨大潜力。在此，通过简单的固态反应轻松合成了一种Bi掺杂的LiGaO PersL材料。Bi离子在LiGaO中不同的Ga和Li多面体位置上的位点选择性和优先占据，使其在254 nm紫外激发下于511和718 nm处具有双峰发射。去除光源后，由于产生了更多更深的陷阱，即氧空位缺陷（V）和杂质缺陷（Bi），观察到强烈的红色余辉。在无机磷光体中很少报道通过Bi单掺杂激活实现红色PersL。LiGaO:%Bi（其中= 0.5 - 5.0）样品还表现出可调谐的PL和随时间变化的PersL特性。结合摩尔斯电码，基于LiGaO:%Bi（= 0、0.5和5.0）样品的异常光学特性设计了一种用于高级动态防伪的多重信息加密模型。这些成果进一步验证了使用Bi单掺杂策略来探索优异的PersL材料并扩展其多功能光学应用。
