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Time-Dependent Phosphorescence Colors from Carbon Dots for Advanced Dynamic Information Encryption.

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Researchers developed carbon dots (CDs) exhibiting time-dependent phosphorescence colors (TDPCs) for dynamic information encryption. This novel material shifts from orange to green emission after light exposure, enabling advanced security applications.

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anti-counterfeitingcarbon dotsphosphorescence inkstime-dependent phosphorescence colors

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Phosphorescent materials with dynamic color-changing properties are crucial for advanced information encryption.
  • Carbon dots (CDs) are emerging nanomaterials with tunable optical properties.

Purpose of the Study:

  • To synthesize carbon dots (CDs) exhibiting time-dependent phosphorescence colors (TDPCs).
  • To explore the potential of these CDs for advanced dynamic information encryption.

Main Methods:

  • One-pot hydrothermal synthesis of CDs from levofloxacin.
  • Characterization of phosphorescence properties of CD ink printed on paper (CD@paper) under different wavelengths.
  • Analysis of phosphorescence decay rates and origins.

Main Results:

  • CD@paper demonstrated a color change from orange to green phosphorescence 1 second after 395 nm light irradiation.
  • Specific phosphorescence colors (green or red) were observed with wavelengths shorter or longer than 395 nm, respectively.
  • Simultaneous activation of red (surface oxide triplet state) and green (N-related triplet state) phosphorescence centers led to the observed TDPC phenomenon.

Conclusions:

  • The synthesized CDs exhibit unique TDPC properties driven by distinct phosphorescent centers with different decay rates.
  • The developed CDs offer a promising platform for creating multilevel, dynamic phosphorescence-colored 3D codes for advanced information encryption.