Ultrasonication-assisted synthesis of CsPbBr(3) and Cs(4)PbBr(6) perovskite nanocrystals and their reversible transformation

We demonstrate an ultrasonication-assisted synthesis without polar solvent of CsPbBr(3) and Cs(4)PbBr(6) perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr(3) PNCs and Cs(4)PbBr(6) PNCs exhibit different optical properties that depend on their morphology, size...

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Detalles Bibliográficos
Autores principales: Rao, Longshi, Ding, Xinrui, Du, Xuewei, Liang, Guanwei, Tang, Yong, Tang, Kairui, Zhang, Jin Z
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2019
Materias:
Full Research Paper
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6423595/
https://www.ncbi.nlm.nih.gov/pubmed/30931208
http://dx.doi.org/10.3762/bjnano.10.66
Descripción
Sumario:We demonstrate an ultrasonication-assisted synthesis without polar solvent of CsPbBr(3) and Cs(4)PbBr(6) perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr(3) PNCs and Cs(4)PbBr(6) PNCs exhibit different optical properties that depend on their morphology, size, and structure. The photoluminescence (PL) emission and quantum yield (QY) of the CsPbBr(3) PNCs can be tuned by changing the ultrasound power, radiation time, and the height of the vibrating spear. The optimized CsPbBr(3) PNCs show a good stability and high PL QY of up to 85%. In addition, the phase transformation between CsPbBr(3) PNCs and Cs(4)PbBr(6) PNCs can be obtained through varying the amount of oleylamine (OAm) and water. The mechanism of this transformation between the CsPbBr(3) PNCs and Cs(4)PbBr(6) PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process.

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