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Multimodal, Convertible, and Chiral Optical Films for Anti-Counterfeiting Labels

机译:Multimodal, Convertible, and Chiral Optical Films for Anti-Counterfeiting Labels

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摘要

Designing a sustainable security model that carries multilevel informationwith numerous optical states will significantly enhance anti-counterfeitingabilities to deter counterfeits, ranging from artworks, currencies, and foodsto medicines, but is enormously challenging. Herein, ambient-friendly,large-area, quadruple-level, and chiral luminescent materials are prepared byincorporating lanthanide complexes wrapped in poly(ethylene glycol) matrixinto chiral nematic cellulose nanocrystal (CNC) films through a co-assemblystrategy. Due to the regulation of the chiral nematic structures, the compositefilms enable full-color structural colors and tunable fluorescence. Notably, thebrightest fluorescent film radiates right-handed circularly polarized luminescencewith an asymmetric factor over ?0.36, a lifetime up to 510 μs, and anabsolute quantum yield up to 66.7%. More interestingly, a fascinating chiroopticalbehavior ranging from azure to khaki can be controlled by a polarizingfilter at given 0° and 90° rotation angles. This anti-counterfeiting systemshowcases the comprehensive properties of bright and responsive photoluminescence,quadruple and convertible color, and flexible and solvent-resistantabilities. This CNC-derived photonic material can act as the multimodalsecurity label on a model banknote, which greatly facilitates its developmentfor practical applications.

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  • 来源
    《Advanced functional materials》 |2022年第33期|2204487.1-2204487.10|共10页
  • 作者单位

    CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023, P. R. China,University of Chinese Academy of SciencesBeijing 100049, P. R. China;

    CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023, P. R. China,School of Biomedical EngineeringDalian University of TechnologyDalian 116024, P. R. China;

    CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023, P. R. ChinaCAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023, P. R. China,University of Chinese Academy of SciencesBeijing 100049, P. R. China;

    Key Laboratory of Advanced Ener;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类
  • 关键词

    anti-counterfeiting; cellulose nanocrystals; chiral nematic structures; circularly polarized luminescence; color switching;

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