Green synthesis of highly luminescent CsPbBr3 quantum dots through silica coating and post-treatment with ligands

IF 2.8 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Flexible and Printed Electronics Pub Date : 2023-08-07 DOI:10.1088/2058-8585/acedbe

X. Wu, K. Yin, M. Yang, Yufeng Hu, Hongshang Peng

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引用次数: 0

Abstract

All-inorganic perovskite quantum dots (PQDs) have received considerable attentions due to their fascinating optical properties. However, the mainstream preparation methods rely on toxic solvents, raising significant environmental and safety concerns. In this work, ethyl acetate was chosen as the environmentally friendly anti-solvent to prepare silica-coated CsPbBr3 PQDs using a aminoalkoxysilane-assisted reprecipitation–encapsulation method. The as-prepared PQDs exhibited tunable emission wavelength and a medium photoluminescence quantum yield (PLQY) of 60%. Furthermore, CsPbBr3 PQDs were post-treated by different ligands with the aim of passivating surface defects. This strategy successfully mitigated the presence of surface defects and minimized non-radiative recombination losses in PQDs. As a result, the PLQY (achieving up to 73%) and stability of PQDs were substantially enhanced (luminescence stability improved by about 40% under the same test conditions). Our studies offer a novel approach for the environmentally friendly large-scale production of PQDs, opening up new possibilities for their practical applications.

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二氧化硅涂层和配体后处理绿色合成高发光CsPbBr3量子点

全无机钙钛矿量子点（PQD）由于其迷人的光学性质而受到广泛关注。然而，主流的制备方法依赖于有毒溶剂，这引发了严重的环境和安全问题。在这项工作中，选择乙酸乙酯作为环境友好的抗溶剂，使用氨基烷氧基硅烷辅助的再沉淀-封装方法制备二氧化硅涂层的CsPbBr3-PQD。所制备的PQD表现出可调谐的发射波长和60%的中等光致发光量子产率（PLQY）。此外，用不同的配体对CsPbBr3-PQD进行后处理，目的是钝化表面缺陷。该策略成功地减轻了PQD中表面缺陷的存在，并将非辐射复合损失降至最低。结果，PLQY（达到高达73%）和PQD的稳定性显著增强（在相同的测试条件下发光稳定性提高了约40%）。我们的研究为环境友好的大规模生产PQD提供了一种新的方法，为其实际应用开辟了新的可能性。

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来源期刊

Flexible and Printed Electronics MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.80

自引率

9.70%

发文量

101

期刊介绍： Flexible and Printed Electronics is a multidisciplinary journal publishing cutting edge research articles on electronics that can be either flexible, plastic, stretchable, conformable or printed. Research related to electronic materials, manufacturing techniques, components or systems which meets any one (or more) of the above criteria is suitable for publication in the journal. Subjects included in the journal range from flexible materials and printing techniques, design or modelling of electrical systems and components, advanced fabrication methods and bioelectronics, to the properties of devices and end user applications.