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Upconversion superburst with sub-2 μs lifetime.

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Lanthanide-doped upconversion nanoparticles exhibit enhanced luminescence through plasmonic coupling, leading to ultrabright, fast, and directional emission for advanced imaging and photonics applications.

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Area of Science:

  • Nanotechnology
  • Photonics
  • Materials Science

Background:

  • Lanthanide-doped upconversion nanoparticles (UCNPs) are crucial for applications like bioimaging and energy harvesting.
  • Their utility is often limited by weak absorption and long radiative lifetimes, hindering fast spontaneous emission.

Purpose of the Study:

  • To enhance the luminescence properties of UCNPs by coupling them with plasmonic modes.
  • To achieve faster, brighter, and directional upconversion emission for improved applications.

Main Methods:

  • Coupling gap plasmon modes with nanoparticle emitters.
  • Precisely controlling the local density of states of the nanoparticles.
  • Tailoring the mode of the plasmonic cavity.

Main Results:

  • Direct observation of upconversion superburst with directional, fast, and ultrabright luminescence.
  • Achieved emission amplification of four to five orders of magnitude.
  • Increased spontaneous emission rate by 166-fold.
  • Demonstrated active control over upconversion emission color by tailoring plasmonic cavity modes.

Conclusions:

  • Plasmonic coupling significantly enhances UCNP luminescence, overcoming previous limitations.
  • This approach enables rapid nonlinear image scanning nanoscopy.
  • Opens possibilities for high-frequency, single-photon emitters operating at telecommunication wavelengths.