纳米晶
发光
材料科学
纳米颗粒
纳米技术
多孔性
粒子(生态学)
介孔材料
化学工程
光电子学
化学
复合材料
工程类
地质学
海洋学
催化作用
生物化学
作者
Xiaoya Yu,Linzhong Wu,Di Yang,Muhan Cao,Xing Fan,Haiping Lin,Qixuan Zhong,Yong Xu,Qiao Zhang
标识
DOI:10.1002/anie.202005120
摘要
Abstract 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 CsPbBr 3 NCs 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 CsPbBr 3 NCs in anti‐counterfeiting are demonstrated by using CsPbBr 3 NCs@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 CsPbX 3 , but also open a new way to design CsPbX 3 materials for new applications.
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