Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 34, Pages 14527-14532Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005120
Keywords
anti-counterfeiting; CsPbBr3; hydrochromic materials; nanocrystals; porous matrix
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Funding
- National Natural Science Foundation of China [21673150, 21703146, 51802206, 51922073]
- Natural Science Foundation of Jiangsu Province [BK20180097, BK20180846]
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Hydrochromic materials that can reversibly change color upon water treatment have attracted much attention owing to their potential applications in diverse fields. Herein, for the first time, we report that space-confined CsPbBr(3)nanocrystals (NCs) are hydrochromic. When CsPbBr3NCs are loaded into a porous matrix, reversible transition between luminescent CsPbBr(3)and non-luminescent CsPb(2)Br(5)can be achieved upon the exposure/removal of water. The potential applications of hydrochromic CsPbBr3NCs in anti-counterfeiting are demonstrated by using CsPbBr3NCs@mesoporous silica nanospheres (around 100 nm) as the starting material. Owing to the small particle size and negatively charged surface, the as-prepared particles can be laser-jet printed with high precision and high speed. We demonstrate the excellent stability over repeated transformation cycles without color fade. This new discovery may not only deepen the understanding of CsPbX3, but also open a new way to design CsPbX(3)materials for new applications.
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