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Frequency Stabilization and Optically Tunable Lasing in Colloidal Quantum Dot Superparticles.

Steven J Neuhaus1, Emanuele Marino2,3, Christopher B Murray1,2

  • 1Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States.

Nano Letters
|January 5, 2023
PubMed
Summary
This summary is machine-generated.

Colloidal quantum dot superparticles exhibit unstable lasing modes. A light-soaking protocol stabilizes these modes, enabling tunable microlasers for various applications.

Keywords:
lasingnanocrystaloptical stabilityquantum dotsuperparticlesupraparticletunable laser

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Colloidal quantum dots (CQDs) self-assemble into superparticles forming microsphere cavities.
  • These cavities support whispering gallery modes (WGMs) for optically pumped lasing.

Purpose of the Study:

  • Investigate the time- and excitation fluence-dependent lasing properties of CdSe/CdS CQD superparticles.
  • Address the temporal instability and blue-shifting of lasing modes.
  • Explore optically controlled color-tunability of the microlasers.

Main Methods:

  • Fabrication of CdSe/CdS CQD superparticles.
  • Optical pumping and spectral analysis of lasing modes.
  • Development and application of a high-fluence light-soaking protocol.
  • Systematic variation of excitation fluence to study color-tuning.

Main Results:

  • Observed significant temporal blue-shifting (>30 meV) of lasing modes over 15 minutes under constant photoexcitation.
  • Demonstrated a light-soaking protocol that reduces mode blue-shifting by over an order of magnitude (to 1.7 ± 0.5 meV).
  • Achieved optically controlled, reversible, color-tunable lasing from red to green by increasing pump fluence.

Conclusions:

  • CQD superparticles can function as tunable microlasers.
  • The light-soaking protocol significantly enhances the temporal stability of lasing modes.
  • These findings suggest potential applications for CQD superparticles in robust, solution-processable microlasers.