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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摘要采用以丙酮、油胺(OM)和油酸(OA)为前驱体,水和二甲基亚砜(DMSO)为辅助剂的配体辅助再沉淀法,制备高发光、稳定的Cs₄PbBr₆纳米晶。通过透射电子显微镜(TEM)、X射线衍射仪(XRD)、漫反射吸收光谱、荧光光谱、和傅里叶变换红外光谱(FTIR)分析水和二甲基亚砜对Cs₄PbBr₆光学性能的协同影响机理。结果表明,水和二甲基亚砜的引入可以完全占据铅离子的空位,使溴离子更容易嵌入位点,从而促进结晶;二者协同作用能有效促进配体与Cs₄PbBr₆表面相结合,从而优化钝化效果;同时,可以促使Cs₄PbBr₆纳米晶基体中产生Cs₄Pb- Br₆/CsPbBr₃的镶嵌结构,极大地改善了Cs₄PbBr₆纳米晶的光学性能。

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	石子宽
	杨宇
	林良武

关键词 ： Cs₄PbBr₆纳米晶, Cs₄PbBr₆/CsPbBr₃, 水, 二甲基亚砜, 钝化效应

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

收稿日期: 2021-03-18 出版日期: 2021-09-26

ZTFLH:

O649.1

基金资助:装备预研重点实验室基金资助项目(6142912xxxx); 湖南省自然科学基金面上项目(2018JJ2509)

通讯作者: 林良武,博士。电话：18890393866;E-mail: linliangwu@csu.edu.cn

引用本文:

石子宽, 杨宇, 林良武. 水和二甲基亚砜协同改善Cs₄PbBr₆纳米晶的光学性能[J]. 粉末冶金材料科学与工程, 2021, 26(4): 381-386.
SHI Zikuan, YANG Yu, LIN Liangwu. Synergistic improvement of optical properties of Cs₄PbBr₆ nanocrystals by water and dimethyl sulfoxide. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 381-386.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I4/381

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