Inorganic Salt Solution Assisted Grinding Synthesis of Stimuli-Responsive Perovskites for Reversible Information Encryption and Decryption Based on I Ching 64 Hexagrams
Jiali Yu, Shuangqiang Fang, Haoliang Cheng, Dongjie Han, Qiangqiang Zhu, Yue Zhai, Lin He, Jiaqi Ou, Renjie Xu, Le Wang
Abstract
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 Cs 2 KInCl 6:Sb 3+ and yellow-emission Cs 2 InCl 5 ·H 2 O:Sb 3+ 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.