Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 31, Pages 26556-26564Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b06436
Keywords
inorganic perovskites; anti-counterfeiting; Cs4PbBr6; two-photon photoluminescence; thermal responsive luminescence
Funding
- National Key Research and Development Program of China [2016YFB0401701]
- National Basic Research Program of China [2014CB931702]
- NSFC [61604074, 51572128, 51672132]
- NSFC-RGC [5151101197]
- Natural Science Foundation of Jiangsu Province [BK20160827]
- China Postdoctoral Science Foundation [2016M590455]
- Fundamental Research Funds for the Central Universities [30917011202, 30915012205, 30916015106]
- PAPD of Jiangsu Higher Education Institutions
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Novel fluorescence with highly covert and reliable features is quite desirable to combat the sophisticated counterfeiters. Herein, we report a simultaneously triple-modal fluorescent characteristic of CsPbBr3@Cs4PbBr6/SiO2 by the excitation of thermal, ultraviolet (UV) and infrared (IR) light for the first time, which can be applied for the multiple modal anti-counterfeiting codes. The diphasic structure CsPbBr3@Cs4PbBr6 nanocrystals (NCs) was synthesized via the typical reprecipitation method followed by uniformly encapsulation into silica microspheres. Cubic CsPbBr3 is responsible for the functions of anti-counterfeiting, while Cs4PbBr6 crystalline and SiO2 are mainly to protect unstable CsPbBr3 NCs from being destroyed by ambient conditions. The as-prepared CsPbBr3@Cs4PbBr6/SiO2 NCs possess improved stability and are capable of forming printable ink with organic binders for patterns. Interestingly, the fluorescence of diphasic CsPbBr3@Cs4PbBr6/SiO2 capsule patterns can be reversibly switched by the heating, UV, and IR light irradiation, which has been applied as triple-modal fluorescent anti counterfeiting codes. The results demonstrate that the perovsldte@silica capsules are highly promising for myriad applications in areas such as fluorescent anti-counterfeiting, optoelectronic devices, medical diagnosis, and biological imaging.
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