材料科学
钙钛矿(结构)
发光
纳米晶
光致发光
加密
相变
相(物质)
限制
空位缺陷
纳米技术
化学工程
光电子学
计算机科学
结晶学
化学
凝聚态物理
计算机网络
工程类
有机化学
物理
机械工程
作者
Quan Xu,Tianwei Zhang,Mengjia Liu,Min Wang,Kun Cao,Rong Chen
标识
DOI:10.1021/acsami.4c01996
摘要
Luminescent perovskite nanocrystals (NCs), possessing the advantages of low cost, easy detection, and excellent luminescence, are becoming more and more significant in the fields of information encryption and decryption. Most hydrochromic perovskite NCs for information encryption have moderate reversibility and are easily passively decrypted by water in the moist air, limiting their practical applications. Herein, a lyochromic material is synthesized based on reversible phase transition between luminescent CsPbBr3–HBr (pretreating CsPbBr3 with HBr) and nonluminescent Cs4PbBr6, exhibiting excellent reversibility in 50 cycles triggered by CsBr solution. HBr treatment boosts the ion migration of NCs via diminishing surface ligands and passivating Br vacancy, assisting CsBr concentration acting as a crucial factor in dynamic ion exchange equilibrium between the trigger solution and CsPbBr3–HBr. By utilizing CsPbBr3–HBr as a safety ink, the CsBr-triggered photoluminescence switch has been demonstrated to be reproducible, stable, and reliable for information encryption and decryption.
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