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Confining energy migration in upconversion nanoparticles towards deep ultraviolet lasing.

Xian Chen1, Limin Jin2, Wei Kong1

  • 1Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China.

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Summary

Harnessing particle size effects in NaYbF4:Tm enhances multiphoton upconversion by confining energy migration. This breakthrough enables efficient deep ultraviolet lasing, offering new possibilities for practical applications.

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Area of Science:

  • Materials Science
  • Photonics
  • Nanotechnology

Background:

  • Particle size manipulation is key to tuning optical properties in materials.
  • Multiphoton upconversion is a process where multiple low-energy photons are converted into one high-energy photon.
  • Enhancing upconversion efficiency is crucial for various photonic applications.

Purpose of the Study:

  • To investigate the effect of particle size on multiphoton upconversion in an insulator system (NaYbF4:Tm).
  • To explore the potential of spatial confinement of energy migration for enhancing upconversion.
  • To demonstrate efficient deep ultraviolet (DUV) lasing through optimized upconversion.

Main Methods:

  • Synthesis of NaYbF4:Tm nanoparticles with controlled sizes.
  • Spectroscopic analysis to study energy migration and upconversion processes.
  • Room-temperature lasing experiments under 980-nm diode pumping.

Main Results:

  • Demonstrated enhanced multiphoton upconversion in nanosized NaYbF4:Tm due to spatial confinement of energy migration.
  • Achieved efficient five-photon upconversion emission of Tm(3+) without concentration quenching.
  • Realized room-temperature lasing emission at ~311 nm with optical gain two orders of magnitude higher than conventional systems.

Conclusions:

  • Spatial confinement of energy migration is a versatile strategy for enhancing multiphoton upconversion.
  • The NaYbF4:Tm system offers a viable route for diode-pumped deep ultraviolet lasing.
  • Findings pave the way for practical applications requiring efficient DUV light sources.