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Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting.

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Lanthanide-doped upconversion nanoparticles show tunable colors under pulsed laser excitation. Pulse duration and frequency control emission, enabling applications in anti-counterfeiting technologies.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Lanthanide-doped upconversion nanomaterials offer potential in optoelectronics, displays, and bioimaging.
  • Conventional methods achieve emission tuning via chemical control of material properties under continuous-wave laser excitation.

Purpose of the Study:

  • To investigate the effect of pulsed laser excitation on the upconversion emission of NaYF4:Er/Tm@NaYF4 core-shell nanoparticles.
  • To explore the tunability of upconversion emission color by manipulating pulsed laser parameters.

Main Methods:

  • Synthesis of NaYF4:Er/Tm@NaYF4 core-shell nanoparticles.
  • Excitation of nanoparticles using pulsed lasers with varying pulse durations and repetition frequencies.
  • Spectroscopic analysis of upconversion emission.

Main Results:

  • A significant color transformation from green to red emission was observed under pulsed laser excitation.
  • Upconversion emission color is controllable by adjusting pulse duration and repetition frequency.
  • Proposed mechanism involves pulsed laser-induced non-steady upconversion states.

Conclusions:

  • Pulsed laser excitation provides a novel method for tuning the upconversion emission color of lanthanide-doped nanoparticles.
  • The demonstrated tunable fluorescence emission makes these nanoparticles suitable for transparent anti-fake printing applications.