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Tunable multimodal printable up-/down-conversion nanomaterials for gradient information encryption.

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Researchers developed printable carbon dots (CDs) for advanced information encryption. These CDs offer tunable multicolor fluorescence and room-temperature phosphorescence for robust anti-counterfeiting applications.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Phosphor-based security techniques leverage unique optical properties for information protection.
  • Carbon dots (CDs) with multicolor fluorescence (FL) and room-temperature phosphorescence (RTP) are promising for advanced information encryption.
  • Developing tunable, multimodal, and printable CDs presents significant challenges.

Purpose of the Study:

  • To create color-tunable liquid and decay time-tunable powdered carbon dots.
  • To develop multilevel security anti-counterfeiting patterns using screen printing technology.
  • To enhance security strength by combining FL, RTP, and near-infrared upconversion luminescence.

Main Methods:

  • Synthesized liquid carbon dots with color-tunable properties (blue to red).
  • Achieved decay time-tunable RTP in powdered CDs via post-treatment with urea.
  • Utilized screen printing technology to create anti-counterfeiting patterns with security inks.

Main Results:

  • Demonstrated color-tunable security patterns using multicolor liquid CDs.
  • Enhanced security through the combination of FL and RTP dual-mode luminescence.
  • Achieved higher-level anti-counterfeiting by integrating near-infrared upconversion luminescence phosphors.

Conclusions:

  • The proposed strategy provides superior coding capacity for advanced information encryption.
  • The developed carbon dot systems exhibit excellent security performance for gradient information encryption.
  • This research offers a valuable reference for cutting-edge information security applications.