Fluorescence‐enhanced Cs4PbBr6/CsPbBr3 composites films synthesized by double‐films solid phase reaction method

• Published in: Luminescence (Chichester, England) Vol. 36; no. 3; pp. 631 - 641
• Main Authors: Xiong, Xuhui, Liu, Hu, Wang, Wei, Gong, Jinhui, Chen, Xiangting, Zhao, Yaxuan, Tian, Tingfang, Wang, Li
• Format: Journal Article
• Language: English
• Published: Bognor Regis Wiley Subscription Services, Inc 01-05-2021
• Subjects: Air temperature; Cs4PbBr6/CsPbBr3; Fluorescence; fluorescence enhancement; Ligands; Luminescence; Particulate composites; perovskite stability; Photoluminescence; Photons; Quantum dots; self‐transformation; solid phase reaction; Solid phases; Stability; Vapor deposition
• ISSN: 1522-7235; 1522-7243
• DOI: 10.1002/bio.3981

Due to indispensable ligands, polluted organic solution, or complex vapour deposition, stable CsPbBr3 film is hard to be prepared directly using a simple and environmentally friendly method. To improve the stability of CsPbBr3 film and its synthesis methods, the double‐films solid phase reaction was developed, and Cs4PbBr6/CsPbBr3 composites were designed. Although the synthesized particle had a size of 2–5 μm, much larger than that of quantum dots, in ambient conditions the composites films still showed good photoluminescence properties, with the highest photoluminescence quantum yield of 80%. It had good stability against air, temperature and humidity, and even had interesting fluorescence‐enhanced phenomenon after about 4 days.
Cs4PbBr6/CsPbBr3 composites films were prepared for the first time using a novel and simple double‐films solid phase reaction method. The prepared films had interesting fluorescence‐enhanced phenomena in ambient conditions, related to self‐transformation. Fluorescence‐enhanced Cs4PbBr6/CsPbBr3 composites exhibited excellent stability against air, temperature, and humidity, with the highest photoluminescence quantum yield of 80%.