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Multi-layer programmable spectral anti-counterfeiting based on quantum dots inkjet printing.

Hao Cui, Junwei Li, Kai Wei

    Optics Express
    |April 27, 2022
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    This study introduces a novel anticounterfeiting system using quantum dot (QD) inks. The system offers high security and convenient operation by embedding hidden information visible only under specific ultraviolet light conditions.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Analytical Chemistry

    Background:

    • The anticounterfeiting field seeks high security and user-friendly solutions.
    • Current methods often lack robust information concealment and rapid identification capabilities.

    Purpose of the Study:

    • To develop an advanced anticounterfeiting system utilizing quantum dot (QD) inks with tunable fluorescence wavelengths.
    • To integrate spectroscopy for secure information identification in labels.

    Main Methods:

    • Utilizing Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) quantum dots (QDs) of varying sizes to create inks with distinct fluorescence emission spectra.
    • Printing software-designed labels with hidden information using these QD inks onto overlapping areas.
    • Employing ultraviolet (UV) light excitation and bandpass filters for information retrieval.

    Main Results:

    • Information is concealed under natural light, becoming visible only with specific UV excitation and bandpass filters.
    • The system demonstrates flexible label design, rapid production, and enhanced information concealment.
    • Successful identification of multiple, layered information through distinct fluorescence wavelengths.

    Conclusions:

    • The proposed QD-based anticounterfeiting system offers a secure, flexible, and efficient solution.
    • The technology shows significant potential for applications in product authentication and secure displays.
    • The combination of tunable QD fluorescence and spectroscopic identification provides a robust anti-duplication mechanism.