Optical storage technology for information encryption is a popular means of safeguarding information. Herein, a Bi³⁺-activated ZnGa₂O₄ multimode dynamic photoluminescence (PL) material is developed. Upon being irradiated with an ultraviolet lamp at a fixed excitation wavelength of 254 nm, the ZnGa₂O₄: x% Bi³⁺ (x = 0.5–5.0) samples exhibit varying degrees of dynamic PL emission due to a distinct Bi³⁺ doping effect. The mechanism underlying the dynamic PL of ZnGa₂O₄: Bi³⁺ associated with Bi³⁺-activated trap concentration modulation is investigated using thermoluminescence spectra. Additionally, the ZnGa₂O₄: 5% Bi³⁺ sample shows a reversible thermally responsive dynamic PL with a color variation from blue to red upon heating from 283 to 393 K. Predesigned procedures based on single-wavelength-mediated photochromic and thermochromic dynamic PL emissions of ZnGa₂O₄: Bi³⁺ are designed for rewritable optical data storage and high-level information encryption. Also, an enhanced encryption scheme with a mask encoding technique applying a ZnGa₂O₄: Bi³⁺ hybridized polyvinylidene difluoride film is then proposed to increase the security level. Accordingly, this work provides a feasible way to rationally design dynamic PL material offering more creative designs for safeguarding information via encryption.

中文翻译：

---

用于光信息加密的 Bi3+ 激活 ZnGa2O4 的多模动态光致发光

用于信息加密的光存储技术是保护信息的流行手段。在此，开发了一种Bi ³⁺激活的ZnGa ₂ O _{4多模动态光致发光(PL)材料。}在用 254 nm 固定激发波长的紫外灯照射后，ZnGa ₂ O ₄ : x % Bi ³⁺ ( x = 0.5–5.0) 样品由于明显的 Bi ³⁺掺杂而表现出不同程度的动态 PL 发射影响。_{ZnGa 2} O ₄动态 PL 的潜在机制：Bi ³⁺与 Bi ^3+相关联-激活的陷阱浓度调制使用热释光光谱进行研究。此外，ZnGa ₂ O ₄ : 5% Bi ³⁺样品显示出一种可逆的热响应动态 PL，当从 283 K 加热到 393 K 时颜色会从蓝色变为红色。基于单波长介导的光致变色和热致变色动态的预设计程序ZnGa ₂ O ₄ : Bi ³⁺的 PL 发射设计用于可重写光学数据存储和高级信息加密。此外，增强型加密方案采用掩码编码技术，应用 ZnGa ₂ O ₄ : Bi ³⁺然后提出杂化聚偏二氟乙烯薄膜以提高安全级别。因此，这项工作提供了一种合理设计动态 PL 材料的可行方法，为通过加密保护信息提供了更具创造性的设计。