Preparation of CsPbBr3-Cs4PbBr6 Composite NCs by Ligand Assisted Mechanochemistry Method and Its Luminescence Intensity and Stability

Abstract

Abstract: CsPbBr₃-Cs₄PbBr₆ perovskite composite nanocrystals (NCs) were successfully prepared by mechanochemistry method at room temperature, introducing trace amounts of methanol and oleylamine as ligands. The nanocrystals were tested by powder X-ray diffraction (XRD), elemental content analysis (EDS), ultraviolet-visible spectroscopy (UV-Vis), photoluminescence(PL) spectroscopy and transmission electron microscopy (TEM). Compared with the samples without methanol, the luminescence intensity of the samples with 0.85 mL methanol increases by 58%, and the quantum yield (PLQY) increases from 11% to 55%. Moreover, the presence of Cs₄PbBr₆ in the composite NCs improves the stability of the samples at room temperature. This experiment confirm that the introduction of methanol in the mechanochemistry preparation process could adjust the composition of the complex nanocrystals, thus significantly improving the luminescence intensity and stability of the products, which provides a new idea for the synthesis of luminescent nanocrystals at room temperature.

Key words: CsPbBr₃, Cs₄PbBr₆, mechanochemistry method, photoluminescence, composite nanocrystal

CLC Number:

O641
O471.1

DONG Qizheng, HUANG Xinyi. Preparation of CsPbBr₃-Cs₄PbBr₆ Composite NCs by Ligand Assisted Mechanochemistry Method and Its Luminescence Intensity and Stability[J]. Journal of Synthetic Crystals, 2022, 51(12): 2104-2111.

References

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Preparation of CsPbBr₃-Cs₄PbBr₆ Composite NCs by Ligand Assisted Mechanochemistry Method and Its Luminescence Intensity and Stability

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