Information security is a long-standing hot issue, but traditional encryption and decryption technologies fall short under present-day demands. Research on stimulus-responsive metal halide perovskites offers promising solutions. However, common hydrothermal or hot injection synthesis methods are time-consuming and require harsh conditions. Here, a facile two-step inorganic-salt-solution-assisted grinding strategy is proposed. Through this method, cations and rare earth ion doping and halogen-site substitution all can be achieved without the use of strong acids, organic solvents, and high temperatures. Significantly, by this two-step postsynthesizing, the structural dimensional transformation of perovskites can also be realized. Especially, the reversible conversion between blue-emission Cs₂KInCl₆:Sb³⁺ and yellow-emission Cs₂InCl₅·H₂O:Sb³⁺ is explored by inserting and removing KCl, and the driven mechanism of this reversible phase transition is determined by formation enthalpy and formation energy variation. Finally, on the basis of the reversible phase transition and combining I Ching’s 64 hexagrams with the consonants and vowels of Chinese characters in pinyin, a culturally rich, more secure, and innovative encryption and decryption mode is created. This study not only provides a facile and open-plan mechanochemical synthesis for metal halide perovskites but also offers an advanced spark of thought for information encryption and decryption.

中文翻译：

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无机盐溶液辅助研磨合成刺激响应性钙钛矿用于基于易经64卦的可逆信息加解密


信息安全是一个长期存在的热点问题，但传统的加解密技术已经不能满足当今的需求。对刺激响应的金属卤化物钙钛矿的研究提供了有前景的解决方案。然而，常见的水热或热注射合成方法耗时且要求苛刻。在这里，提出了一种简便的两步无机盐溶液辅助研磨策略。通过该方法，无需使用强酸、有机溶剂和高温，即可实现阳离子和稀土离子的掺杂以及卤素位点的取代。值得注意的是，通过这种两步后合成，还可以实现钙钛矿的结构尺寸转换。特别是，蓝色发射Cs ₂ KInCl ₆ :Sb ³⁺ 和黄色发射Cs ₂ InCl ₅ ·H ₂ O:Sb ³⁺ 通过插入和去除KCl探索了这种可逆相变的驱动机制，其驱动机制由形成焓和形成能变化决定。最终，在可逆相变的基础上，将《易经》64卦与汉语拼音的声母、韵母相结合，创造出一种文化丰富、更安全、创新的加解密模式。这项研究不仅为金属卤化物钙钛矿提供了一种简便、开放式的机械化学合成方法，而且为信息加密和解密提供了先进的思想火花。