CsPbBr3@CsPbBr3–xClx Perovskite Core–Shell Heterojunction Nanowires via a Postsynthetic Method with HCl Gas

CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are promising materials due to their excellent optoelectronic properties. This work shows a successful anion exchange reaction in CsPbBr 3 nanowire (NW) systems with HCl gas resulting in a blue-green light-emitting CsPbBr 3 @CsPbBr 3– x Cl x core...

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Bibliographic Details
Published in:ACS omega 2020-05, Vol.5 (20), p.11578-11584
Main Authors: Zhang, Gaoqian, Song, Pengjie, Shen, Zhaohui, Qiao, Bo, Song, Dandan, Cao, Jingyue, Xu, Zheng, Swelm, Wageh, Al-Ghamdi, Ahmed, Zhao, Suling
Format: Article
Language:English
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Summary:CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are promising materials due to their excellent optoelectronic properties. This work shows a successful anion exchange reaction in CsPbBr 3 nanowire (NW) systems with HCl gas resulting in a blue-green light-emitting CsPbBr 3 @CsPbBr 3– x Cl x core–shell heterojunction. By adjusting the reaction time and the reaction temperature, the structure and light emission of the NWs can be adjusted. The core–shell heterojunction NCs are stably luminescent in 24 h. The rational mechanism of anion exchange in perovskite NCs is also investigated. The work highlights the feasibility of NWs heterogeneously prepared under the HC1 gas atmosphere, which provides a new strategy for studying the two- and multicolor luminescent perovskite NCs.
ISSN:2470-1343
DOI:10.1021/acsomega.0c00824