近年来，液晶网络材料因为在人工肌肉、软体机器人、微流控制器和4D打印材料等智能软器件领域的应用受到了越来越多的关注。液晶网络材料在化学结构上同时包含聚合物交联网络和液晶基元，在性能上同时具有聚合物的可加工性、化学稳定性和力学特性以及液晶可调的各向异性，因此具有外观易编辑、功能可调、对多种刺激都能响应等优点。利用这些特点，可以将指定的形状或颜色信息精确地写入到材料中，同时在特定外界刺激（光，热，电场，溶剂等）下使信息再次显现，实现信息的存储、加密与读取。本文简要论述了具有可编辑颜色（包括结构色和荧光颜色）和形状记忆的液晶网络材料的信息存储方式，重点介绍了液晶网络材料在伪装、多级信息存储与信息传递等方面的应用研究进展。

发光材料在机密信息保护与防伪领域中发挥着重要作用。钙钛矿纳米晶作为一类高效低成本发光材料可通过两步法原位转换获得, 使其在信息加密、解密领域极具应用前景。本研究探索了“不可见”铅有机框架和发光MAPbBr₃钙钛矿纳米晶间的可逆转换, 以及它们在荧光打印信息存储中的应用。通过铅离子与2-甲基咪唑配位构建新型金属有机框架, 实现铅离子限域分布, 在此基础上通过与甲胺溴原位反应生成钙钛矿纳米晶。利用金属有机框架在可见/紫外光下无光响应的特性, 通过墨水打印对信息进行加密存储。加密信息经甲胺溴喷雾处理, 引发原位反应生成钙钛矿纳米晶, 在紫外光下表现出强光致发光特性, 实现信息解密。利用甲胺溴和水作为解密和加密试剂可实现荧光的多次循环显示与消除。

长余辉材料中的深陷阱具有优异的能量存储和释放性能，因此在光学信息存储方面有很大应用优势。本文采用高温固相法合成了新型黄色长余辉材料γ?SrGa₂O₄∶Bi³⁺，其发射光谱是以565 nm为中心、范围为400~800 nm的宽带发射，该发射归属于Bi³⁺离子的³P₁→¹S₀跃迁。在紫外灯照射后，观察到γ?SrGa₂O₄∶Bi³⁺样品明亮的黄色长余辉发光。通过热释光谱分析可知γ?SrGa₂O₄∶Bi³⁺中主要有三种陷阱，其深度分别为0.678，0.838，0.978 eV。深度为0.678 eV的浅陷阱是该材料产生长余辉现象的主要原因，而深度为0.838 eV的深陷阱对应的热释峰强度在12 h后仅下降18.6%，这说明深陷阱中电子释放缓慢。基于材料的深陷阱性能，设计了字母图案并对其进行光学信息存储实验，结果表明该材料在信息存储方面有潜在应用前景。

Printing stable color with a lithography-free and environment-friendly technique is in high demand for applications. We report a facile strategy of ultrafast laser direct writing (ULDW) to produce large-scale embedded structural colors inside transparent solids. The diffraction effect of gratings enables effective generation of structural colors across the entire visible spectrum. The structural colors inside the fused silica glass have been demonstrated to exhibit excellent thermal stability under high temperature up to 1200°C, which promises that the written information can be stable for long time even with unlimited lifetime at room temperature. The structural colors in the applications of coloring, anti-counterfeiting, and information storage are also demonstrated. Our studies indicate that the presented ULDW allows for fabricating large-scale and high thermal-stability structural colors with prospects of three-dimensional patterning, which will find various applications, especially under harsh conditions such as high temperature.

Organic photoresponsive materials can undergo various reversible variations in certain physical and chemical properties, such as optical properties, electrochemical properties, conformation, and conductivity, upon photoirradiation. They have been widely applied in various optoelectronic fields, especially in information storage. We summarize research progress on organic photoresponsive materials for information storage. First, the design strategies and photoswitching mechanisms for various kinds of organic photoresponsive materials, including small organic molecules, metal complexes, polymers, supramolecules, and cholesteric liquid crystals, are systematically summarized. These materials exhibit reversible changes of absorption and/or emission properties in response to different wavelengths of light. Subsequently, the applications of these organic materials in information storage, such as data (re)writing and erasing, encryption and decryption, and anticounterfeiting, are introduced in detail. Finally, the current challenges and future directions in this rapidly growing research field are discussed. The review will provide important guidance on the future works about the design of excellent organic photoresponsive materials for optoelectronic applications.