Cs3Cu2X5纳米晶光致发光性能及光照抗菌性能

doi:10.3976/j.issn.1002-4026.2025120

Abstract

Abstract: Lead-based halide perovskite nanocrystals have attracted extensive attention due to their outstanding optoelectronic properties. However, their small Stokes shifts often lead to severe self-absorption, which greatly limit their luminescence efficiency and practical applications. Moreover, the inherent biological toxicity of lead poses irreversible risks to human health and the environment. To address these issues, this study synthesized lead-free Cs₃Cu₂X₅(X = Cl, Br, I) perovskite nanocrystals using a hot-injection method and systematically characterized their phase purity, compositions, and microstructures. Optical measurements, including fluorescence spectroscopy and temperature-dependent fluorescence lifetimes, revealed that the high photoluminescence quantum yield and large Stokes shifts of Cs₃Cu₂X₅nanocrystals originate from their self-trapped exciton emission mechanism. To enhance their applicability, we further coated the nanocrystals with a SiO₂shell, which significantly improved their dispersibility in aqueous media and their biocompatibility. Finally, usingEscherichia colias a model bacterium, the photo-induced antibacterial performance of the Cs₃Cu₂X₅@SiO₂core–shell nanocrystals was evaluated through turbidity analysis and colony counting assays. This study revealed the physical origin of the outstanding luminescent properties of Cs₃Cu₂X₅nanocrystals and demonstrated their potential as efficient and safe optical materials in biomedical applications.

Key words: keyword perovskite, nanocrystals, core-shell structure, luminescent mechanism, biocompatibility, light-induced antibacterial performance

CLC Number:

TB34

HOU Lijun, ZHAO Shunfan, SHAN Yansu, LU Yanqin, CAO Bingqiang. Photoluminescence properties and light-induced antibacterial performance of Cs₃Cu₂X₅ nanocrystals[J].Shandong Science, 0, (): 1-.

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Photoluminescence properties and light-induced antibacterial performance of Cs₃Cu₂X₅ nanocrystals

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Photoluminescence properties and light-induced antibacterial performance of Cs3Cu2X5 nanocrystals

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Photoluminescence properties and light-induced antibacterial performance of Cs₃Cu₂X₅ nanocrystals