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Observation and implication of halide exchange beyond CsPbX3 perovskite nanocrystals†
Nanoscale ( IF 5.8 ) Pub Date : 2019-01-22 00:00:00 , DOI: 10.1039/c8nr10150g
Chao Jia 1, 2, 3, 4, 5 , Hui Li 1, 2, 3, 4, 5 , Longfei Tan 6, 7, 8, 9, 10 , Xianwei Meng 6, 7, 8, 9, 10 , Jianbo Gao 11, 12, 13, 14, 15 , Hongbo Li 1, 2, 3, 4, 5
Affiliation  

Anion exchange between pre-synthesized all-inorganic nanocrystals with a perovskite structure is a promising approach to tune their chemical composition and optical properties. Herein we have reported the first study of internanocrystal anion exchange reactionsin the cesium lead halide family, including CsPbX3, Cs4PbX6 and CsX, and we found that the anion exchange dynamics is highly dependent on their crystalline phase. In stark contrast to the fast rate in CsPbX3, cesium based non-perovskite NCs display much slower halide mobility. The reaction time is increased to several hours in Cs4PbX6 and days in CsX, respectively. Furthermore, we confirm that mixing these NCs with the same halide but different structures will induce halide diffusion from Cs4PbX6 NCs and CsX NCs to CsPbX3 NCs. This feature can be explored to utilize the Cs4PbX6 NCs and CsX NCs as a halide source to improve the photoluminescence efficiency and colloidal stability of CsPbX3 NCs.

中文翻译:

CsPbX 3钙钛矿纳米晶体以外的卤化物交换的观察和意义

具有钙钛矿结构的预合成全无机纳米晶体之间的阴离子交换是一种有前途的调整其化学组成和光学性质的方法。在这里,我们已经报道了铯铯卤化物家族中包括CsPbX 3,Cs 4 PbX 6和CsX在内的晶体间阴离子交换反应的首次研究,并且我们发现阴离子交换动力学高度依赖于它们的结晶相。与CsPbX 3中的快速速率形成鲜明对比的是,基于铯的非钙钛矿型NC显示出慢得多的卤化物迁移率。在Cs 4 PbX 6中,反应时间增加到几个小时和CsX中的天数。此外,我们确认将这些NCs与相同的卤化物但结构不同混合会导致卤化物从Cs 4 PbX 6 NCs和CsX NCs扩散到CsPbX 3 NCs。可以探索此功能,以利用Cs 4 PbX 6 NC和CsX NC作为卤化物源来提高CsPbX 3 NC的光致发光效率和胶体稳定性。
更新日期:2019-01-22
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