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06.11.2021 | Letter

Synthesis and luminescence of ultrasmall CsPbBr₃ nanocrystals and CsPbBr₃/Cs₄PbBr₆ composites by one-pot method

verfasst von: Xi-Bing Li, Wen-Tao Huang, Rui-Rong Zhang, Yue Guo, Hui-Jie Yang, Xiao-Yue He, Ming-Xun Yu, Li-Xi Wang, Qi-Tu Zhang

Erschienen in: Rare Metals | Ausgabe 4/2022

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All-inorganic perovskites CsPbX₃ (X = Cl, Br, I) have attracted worldwide interest due to their excellent luminescent performances. Meanwhile, Cs₄PbBr₆ have been studied because they can enhance the luminescent efficiency and stability of CsPbBr₃. Herein, we introduced a microfluidic method based on room-temperature supersaturated recrystallization to synthesize blue-emitting CsPbBr₃ nanocrystals (NCs) and green-emitting CsPbBr₃/Cs₄PbBr₆ NCs. The ultrasmall CsPbBr₃ NCs emitted at a deep blue wavelength of 461 nm with the full width at half maximum (FWHM) of 15 nm. transmission electron microscopy (TEM) results demonstrated that ultrasmall CsPbBr₃ NCs with the average particle size of 3.8 nm were synthesized and the CsPbBr₃ NCs were crystallized as monoclinic structure. X-ray photoelectron spectrometer (XPS) analysis suggested that ultrasmall CsPbBr₃ suffered from V_Br defect and the surface passivation of Cs₄PbBr₆ possessed a low level of V_Br defect density. The lifetime of CsPbBr₃/Cs₄PbBr₆ was much longer than that of CsPbBr₃. The results showed that ultrasmall CsPbBr₃ NCs can be regarded as a source of blue-emitting material and CsPbBr₃/Cs₄PbBr₆ NCs had a better stability.

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Titel: Synthesis and luminescence of ultrasmall CsPbBr3 nanocrystals and CsPbBr3/Cs4PbBr6 composites by one-pot method
verfasst von: Xi-Bing Li
Wen-Tao Huang
Rui-Rong Zhang
Yue Guo
Hui-Jie Yang
Xiao-Yue He
Ming-Xun Yu
Li-Xi Wang
Qi-Tu Zhang
Publikationsdatum: 06.11.2021
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 4/2022
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-021-01856-4

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