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Related Experiment Video

Updated: Nov 27, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
13:51

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Published on: November 10, 2017

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Low threshold lasing emissions from a single upconversion nanocrystal.

Yunfei Shang1,2,3, Jiajia Zhou4, Yangjian Cai3

  • 1Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.

Nature Communications
|December 2, 2020
PubMed
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This summary is machine-generated.

Researchers harnessed controlled cross-relaxation in nanomaterials to boost luminescence and achieve ultra-low threshold lasing in microcavity lasers. This breakthrough enables efficient upconversion lasing at room temperature using single nanoparticles.

Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Cross-relaxation typically quenches luminescence in emitters.
  • Nanomaterials offer a route to control cross-relaxation for enhanced luminescence efficiency.

Purpose of the Study:

  • To investigate the role of controlled cross-relaxation in modulating nanoparticle brightness and population inversion thresholds.
  • To demonstrate ultra-low threshold lasing in microcavity lasers utilizing engineered upconversion nanoparticles.

Main Methods:

  • Homogenous coating of a 5-μm microcavity with a single layer of upconversion nanoparticles.
  • Doping nanoparticles with 2% Thulium (Tm3+) ions to influence electron accumulation.
  • Characterization of upconversion lasing emissions under continuous-wave excitation.

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Main Results:

  • Controlled cross-relaxation significantly decreased the lasing threshold by over an order of magnitude.
  • Achieved ultra-low threshold upconversion lasing (~150 W/cm2) at room temperature.
  • Demonstrated single nanoparticle lasing with a narrow spectral width (FWHM ~0.45 nm).

Conclusions:

  • Cross-relaxation is a viable mechanism for enhancing luminescence and reducing lasing thresholds in nanomaterials.
  • Engineered upconversion nanoparticles enable efficient, low-threshold lasing in microcavity systems.
  • This work paves the way for novel photonic devices operating with high efficiency at room temperature.