水和二甲基亚砜协同改善Cs<sub>4</sub>PbBr<sub>6</sub>纳米晶的光学性能

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Abstract We developed a new ligand assisted reprecipitation method (LARP) for synthesis of highly luminescent and stable Cs₄PbBr₆ nanocrystals, in which acetone, oleamine (OM) and oleic acid (OA) were used as precursor, water and dimethyl sulfoxide (DMSO) as adjuvant. The synergistic influence mechanism of water and DMSO on the optical properties of Cs₄PbBr₆ was analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), diffuse reflection absorption spectrum, fluorescence spectroscopy and fourier transform infrared spectroscopy (FTIR). The results showed that the addition of water and dimethyl sulfoxide can completely occupy the vacancy of lead ion and promote the crystallization, which makes bromine ion easier to embed into the site, and so that the crystallization is better. The synergistic effect of water and dimethyl sulfoxide can effectively promote the binding of the ligand to the surface of Cs₄PbBr₆, thus optimizing the passivation effect. At the same time, this synergistic effect can promote the formation of Cs₄PbBr₆/CsPbBr₃ mosaic structure in Cs₄PbBr₆ nanocrystalline matrix, which greatly improves the optical properties of Cs₄PbBr₆ nanocrystals.

Key words： Cs₄PbBr₆nanocrystals Cs₄PbBr₆/CsPbBr₃ water DMSO passivation effect

Received: 18 March 2021 Published: 26 September 2021

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	SHI Zikuan
	YANG Yu
	LIN Liangwu

Cite this article:

SHI Zikuan,YANG Yu,LIN Liangwu. Synergistic improvement of optical properties of Cs₄PbBr₆ nanocrystals by water and dimethyl sulfoxide[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 381-386.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I4/381

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