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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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Yb3+-optimized core-shell structured luminescent material for dual-mode encryption and deep learning fluorescence

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    Novel core-shell upconversion luminescent (UCL) materials emit green and blue light for advanced anti-counterfeiting applications. These materials enhance security through integrated QR and Morse code patterns with high recognition accuracy.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nanotechnology

    Background:

    • Upconversion luminescent (UCL) materials offer unique light-emitting properties.
    • Core-shell nanostructures enhance UCL efficiency and functionality.
    • Developing advanced anti-counterfeiting solutions is crucial for information security.

    Purpose of the Study:

    • To synthesize core-shell NaYF4:Yb3+, Nd3+Ln3+@NaYF4:Yb3+ UCL materials.
    • To investigate their luminescent properties and applications in anti-counterfeiting.
    • To develop a robust authentication system using these materials.

    Main Methods:

    • Hydrothermal and epitaxial growth methods for UCL material synthesis.
    • Screen-printing techniques for fabricating security patterns (QR and Morse codes).
    • Development of a residual neural network for pattern recognition.

    Main Results:

    • Synthesized core-shell UCL materials emitting green (Er3+) and blue (Tm3+) light.
    • Achieved significant luminescence intensity enhancement (16.54x and 17.56x) compared to core materials.
    • Demonstrated multi-level security features integrating structural and information encryption.
    • Developed a recognition system with 96.55% accuracy for categorization.

    Conclusions:

    • Core-shell UCL materials show great promise for high-security anti-counterfeiting.
    • Integrated structural and information encryption provides enhanced data protection.
    • The developed recognition system offers reliable and accurate authentication.