Dual-band-tunable all-inorganic Zn-based metal halides for optical anti-counterfeiting
双波段可调谐全无机锌基金属卤化物用于光学防伪
デュアルバンドチューナブルの全無機Zn系金属ハロゲン化物を用いた光学的偽造防止
듀얼-밴드 조정 가능한 전무기적 Zn 기반 금속 할라이드를 이용한 광학적 반란제작
Doble banda sintonizable de haluros metálicos de Zn completamente inorgánicos para anticounterfeiting óptico
Dual-band-tunable all-inorganic Zn-based metal halides for optical anti-counterfeiting
Двуосмантюнабельные полностью неорганические Zn-основанные металлохлориды для оптической защиты от подделок
Meng Wang 王萌 ¹, Dehai Liang 梁德海 ¹, Saif M. H. Qaid ³, Shuangyi Zhao 赵双易 ¹, Yingjie Liu 刘英杰 ², Zhigang Zang 臧志刚 ¹
¹ Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
中国 重庆 重庆大学光电技术及系统教育部重点实验室
² School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China
中国 秦皇岛 燕山大学信息科学与工程学院
³ Department of Physics and Astronomy, College of Sciences, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
Low-dimensional lead-free metal halides have emerged as promising candidates for anti-counterfeiting applications, characterized by their low toxicity, diverse crystal structures, and exceptional optical properties. Conventional anti-counterfeiting technologies based on low-dimensional metal halides are often constrained by complex and time-consuming heating and solvent treatments that may insufficiently modify the luminescent characteristics of emitters, thus hindering their practical implementation in effective anti-counterfeiting strategies.
In this study, we employ an innovative alloying strategy in low-dimensional zinc halides Cs2ZnCl4 to enhance their luminescent performance. By introducing self-trapped exciton (STE) states through the alloying of Cu+ and Sb3+ ions in Cs2ZnCl4, we achieve bright blue and red photoluminescence (PL) centered at 492 nm and 744 nm, respectively, under 266 nm excitation, with only red emission observed under 365 nm excitation. This approach enables instant and reliable anti-counterfeiting applications. This work presents new opportunities for developing robust anti-counterfeiting and information encryption/decryption technologies.
