Visible and near-infrared emission of lead-free Cs3Cu2I5:Bi perovskite by valence state regulation for optical anti-counterfeiting coatings

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-05-21 DOI:10.1016/j.matchar.2025.115203

Qi-Hua Yang , Han-Qi Wei , Shu-Juan Zhao , Gui-Hua Li , Xuan Liu , Le Fu , Zhi-Wei Luo , Jia-Yong Si , Ge-Mei Cai

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引用次数: 0

Abstract

In recent years, the proliferation of counterfeit products has led to increased concerns about anti-counterfeiting technology, with traditional single-mode fluorescence methods proving insufficient due to their susceptibility to replication. The new copper-based halide materials have shown great potential in the field of multi-mode anti-counterfeiting due to their unique structure, excellent luminescence performance, and high defect tolerance. In this work, near-infrared emission of Cs₃Cu₂I₅ was achieved for the first time through Bi doping. By exploiting the dual emission center characteristics of the resulting Cs₃Cu₂I₅:Bi, we demonstrated its excitation wavelength-dependent emission. It was then mixed with cyclohexane to prepare an advanced fluorescent anti-counterfeiting coating for screen printing, enabling high-precision pattern printing onto various substrates. The resulting anti-counterfeiting patterns exhibit excellent weather resistance, remaining virtually unchanged after 60 days at room temperature. This study lays the foundation for expanding the emission range of Cs₃Cu₂I₅ and adjusting multi band emission, and confirms its potential application in the field of multi-mode anti-counterfeiting.

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光学防伪涂料中无铅Cs3Cu2I5:Bi钙钛矿价态调控的可见光和近红外发射

近年来，假冒产品的泛滥引起了人们对防伪技术的关注，传统的单模荧光方法由于容易被复制而被证明是不够的。新型铜基卤化物材料以其独特的结构、优异的发光性能和高的缺陷容忍度，在多模防伪领域显示出巨大的潜力。本文首次通过Bi掺杂实现了Cs3Cu2I5的近红外发射。通过利用所得到的Cs3Cu2I5:Bi的双发射中心特性，我们证明了它的激发波长依赖性发射。然后将其与环己烷混合，制备用于丝网印刷的高级荧光防伪涂层，从而在各种基材上实现高精度图案印刷。由此产生的防伪图案表现出优异的耐候性，在室温下60天后几乎保持不变。本研究为扩大Cs3Cu2I5的发射范围和调整多波段发射奠定了基础，并证实了其在多模防伪领域的潜在应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.