Excitation wavelength dependent triple-mode photoluminescence of copper-based halides for advanced anti-counterfeiting
Source abstract
Abstract
New fluorescent materials with a low cost, hypotoxicity, and concealment are desired for the application of anti-counterfeiting. Herein, we report a CsCu2I3@Cs3Cu2I5 composite with a triple-mode photoluminescence (PL) feature by simply adjusting the excitation wavelengths, which are ascribed to the multiple excited states of different phases in the CsCu2I3@Cs3Cu2I5 composite. The broadband emission and high quantum yield (∼51%) of the composite originate from the structure-oriented self-trapped excitons effect of Cs3Cu2I5 and CsCu2I3 phases. Moreover, the incorporation of polyethylene oxide (PEO) into this composite improves the stability of CsCu2I3@Cs3Cu2I5@PEO against harsh environments. The CsCu2I3@Cs3Cu2I5@PEO composite has a slight decay of ∼5% of its initial PL intensity and only a 3.5% shift of the corresponding color coordinate after 30 days of storage. More importantly, its initial PL intensity shows only 10.3% decay under ultraviolet exposure for 200 h. Our work provides a promising approach to design materials for advanced anti-counterfeiting applications.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Luminescence and Fluorescent Materials · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University 1 , Nanjing, China
School of Electronics and Information Engineering, Nanjing University of Information Science and Technology 2 , Nanjing, China
Department of Electrical and Electronics Engineering, Ataturk University 3 , Erzurum 25240, Türkiye
Department of Electrical and Electronics Engineering, Universiti Putra Malaysia 4 , UPM Serdang, Selangor 43400, Malaysia
Department of Electric and Electronics Engineering, Kyrgyz Turkish Manas University 5 , 56 Chyngyz Aitmatov Avenue, Bishkek, Kyrgyz Republic
College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Sichuan University 6 , Chengdu 610065, China
Funding
National Natural Science Foundation of China · Jiangsu Province Basic Research Program · Ministry of Science and Technology International Cooperation Projects · Natural Science Foundation of Jiangsu Province · Anhui Province Key Laboratory of Optoelectric Materials Science and Technology · National Key Research and Development Program of China · National Natural Science Foundation Project for Young Researcher · Research Fund for International Young Scientists · Program 111_2.0 in China · Leading Technology of Jiangsu Basic Research Plan · Fundamental Research Funds for the Central Universities · Engineering Featured Team Fund of Sichuan University
References (52)
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