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Triple-Mode Protection with Ln3+ Ion-Doped Core-Heptad-Shell Single Nanocrystals for High-Level Security

Venkata N K B Adusumalli1, Hyeon Jung Yu1, Yeongchang Goh2

  • 1School of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.

ACS Applied Materials & Interfaces
|October 30, 2024
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Summary
This summary is machine-generated.

Researchers developed novel core-heptad-shell (CHS) nanocrystals (NCs) for advanced anticounterfeiting. These NCs display multiple emissions through downshifting and orthogonal upconversion, enabling unique security features.

Keywords:
anticounterfeitingcore−heptad-shell nanocrystalsdownshiftingmulticolor emissionorthogonal upconversion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Developing advanced luminescent materials is crucial for security applications.
  • Existing anticounterfeiting technologies often lack multi-modal emission capabilities.
  • Nanocrystals offer tunable optical properties for specialized applications.

Purpose of the Study:

  • To synthesize novel core-heptad-shell (CHS) nanocrystals (NCs) with dual downshifting and orthogonal upconversion luminescence.
  • To investigate the luminescent properties of these CHS NCs for anticounterfeiting applications.
  • To demonstrate the fabrication of invisible patterns and QR codes using these NCs.

Main Methods:

  • Layer-by-layer thermal decomposition synthesis of CHS NCs.
  • Doping with Ce/Tb or Ce/Eu ions for specific luminescence.
  • Surface functionalization with oleic acid (OA) and subsequent removal for aqueous dispersion.
  • Incorporation into carboxymethylcellulose (CMC) polymer for gel formation.
  • Screen-printing of invisible patterns and QR codes.

Main Results:

  • Synthesized OA-capped CHS NCs exhibiting multiple emissions via downshifting and orthogonal upconversion.
  • Achieved enhanced luminescence intensity (21.60-fold for Ce/Tb, 43.59-fold for Ce/Eu) after OA removal.
  • Successfully created invisible patterns and QR codes with distinct emission colors under different excitations.
  • Demonstrated potential for high-level anticounterfeiting using printable luminescent materials.

Conclusions:

  • The developed CHS NCs offer a versatile platform for creating multi-color, multi-excitation security features.
  • The facile synthesis and surface modification enable practical applications in anticounterfeiting.
  • This technology provides a robust solution for high-level product authentication and brand protection.