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Controllable synthesis of CsxPbyBrz-based perovskites by a polar solvent-triggered transformation method and its application as an invisible security ink
- Zhang, Wule, Wang, Zhenzhen, Lin, Pei, Wu, Di, Shi, Zhifeng, Chen, Xu, Xu, Tingting, Tian, Yongtao, Li, Xinjian
- Journal of materials science 2020 v.55 no.16 pp. 6826-6833
- methanol, solvents, toluene
- Recently, all-inorganic CsPbX₃ (X = Cl, Br, I) perovskites have become one of the most promising candidates for photoelectronic and photovoltaic applications. Herein, we report the controllable synthesis of CsₓPbyBrz-based perovskites by a simple polar solvent-triggered (H₂O, CH₃OH) chemical transformation method. The phase of CsₓPbyBrz-based perovskites can be successfully converted from Cs₄PbBr₆ to CsPbBr₃ by using H₂O as a polar solvent and from CsPbBr₃ to CsPb₂Br₅ by using CH₃OH as a polar solvent, and this method can also be applied to synthesize Cs₄PbBr₆/CsPbBr₃ and CsPbBr₃/CsPb₂Br₅ composites by controlling parameters of transformation process. Moreover, a novel kind of encryption and decryption technology is developed based on the characteristics that the white Cs₄PbBr₆ reacts with H₂O to rapidly produce yellow CsPbBr₃, using the Cs₄PbBr₆ toluene solution as the invisible security ink and H₂O as the decryption key. Our results present a controllable route to realize transformation from Cs₄PbBr₆ to CsPbBr₃ and from CsPbBr₃ to CsPb₂Br₅.