DOI number:10.1016/j.matchar.2025.115203
Journal:Materials Characterization
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.
Co-author:Hanqi Wei, Shujuan Zhao, Guihua Li, Xuan Liu, Zhiwei Luo, Jiayong Si
First Author:Qihua Yang
Correspondence Author:Le Fu*, Gemei Cai*
Volume:25
Page Number:115203
Translation or Not:no
Links to published journals:https://www.sciencedirect.com/science/article/pii/S1044580325004929?dgcid=coauthor