Reversible transformation of all-inorganic copper halide perovskite nanocrystals for anti-counterfeiting

Yueming Wang; Yuchen Yan; Dan Li; Wenbo Zhao; Shuhua Chen; Qixuan Zhong; Jun Liu; Fousseyni Diarra; Muhan Cao; Qiao Zhang

doi:10.1039/D1DT02386A

Reversible transformation of all-inorganic copper halide perovskite nanocrystals for anti-counterfeiting†

Yueming Wang,‡^a Yuchen Yan,‡^a Dan Li,^a Wenbo Zhao,^a Shuhua Chen,^a Qixuan Zhong,^a Jun Liu,^a Fousseyni Diarra,^a Muhan Cao

*^a and Qiao Zhang

^a

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* Corresponding authors

^a Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, Jiangsu, People's Republic of China
E-mail: mhcao@suda.edu.cn

Abstract

This work reports a CsI stripping/insertion process that enables the reversible transformation between blue-emissive Cs₃Cu₂I₅ and yellow-emissive CsCu₂I₃ upon moisture/evaporation treatment. The successful transformation can be ascribed to the unique space confinement of the SiO₂ matrix and ligand-free feature of perovskite nanocrystals, which can be a good candidate for anti-counterfeiting.

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Reversible transformation of all-inorganic copper halide perovskite nanocrystals for anti-counterfeiting†

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Reversible transformation of all-inorganic copper halide perovskite nanocrystals for anti-counterfeiting

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