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Open AccessArticle

Synthesis of Highly Photoluminescent All-Inorganic CsPbX3 Nanocrystals via Interfacial Anion Exchange Reactions

1
Engineering Research Centre of Green Manufacturing for Energy-Saving and New-Energy Technology, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
2
College of Engineering, Shantou University, Shantou 515063, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(9), 1296; https://doi.org/10.3390/nano9091296
Received: 26 July 2019 / Revised: 31 August 2019 / Accepted: 8 September 2019 / Published: 11 September 2019
All-inorganic cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have attracted significant attention owing to their fascinating electronic and optical properties. However, researchers still face challenges to achieve highly stable and photoluminescent CsPbX3 NCs at room temperature by the direct-synthesis method. Herein, we synthesize CsPbX3 NCs by a facile and environmentally friendly method, which uses an aqueous solution of metal halides to react with Cs4PbBr6 NCs via interfacial anion exchange reactions and without applying any pretreatment. This method produces monodisperse and air-stable CsPbX3 NCs with tunable spectra covering the entire visible range, narrow photoluminescence emission bandwidth, and high photoluminescence quantum yield (PL QY, 80%). In addition, the chemical transformation mechanism between Cs4PbBr6 NCs and CsPbX3 NCs was investigated. The Cs4PbBr6 NCs were converted to CsPbBr3 NCs first by stripping CsBr, and then, the as-prepared CsPbBr3 NCs reacted with metal halides to form CsPbX3 NCs. This work takes advantage of the chemical transformation mechanism of Cs4PbBr6 NCs and provides an efficient and environmentally friendly way to synthesize CsPbX3 NCs. View Full-Text
Keywords: Cs4PbBr6 NCs; CsPbX3 NCs; interfacial anion exchange; chemical transformation Cs4PbBr6 NCs; CsPbX3 NCs; interfacial anion exchange; chemical transformation
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MDPI and ACS Style

Li, Z.; Song, C.; Rao, L.; Lu, H.; Yan, C.; Cao, K.; Ding, X.; Yu, B.; Tang, Y. Synthesis of Highly Photoluminescent All-Inorganic CsPbX3 Nanocrystals via Interfacial Anion Exchange Reactions. Nanomaterials 2019, 9, 1296.

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