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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

Updated: Mar 6, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy.

Fengjia Fan1, Oleksandr Voznyy1, Randy P Sabatini1

  • 1Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

Nature
|March 22, 2017
PubMed
Summary
This summary is machine-generated.

Colloidal quantum dots (CQDs) with reduced band-edge degeneracy and narrower linewidths are achieved through facet-selective epitaxy. This strain engineering enables continuous-wave lasing in CQD solids, overcoming previous limitations.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Physics

Background:

  • Colloidal quantum dots (CQDs) have desirable optical properties but suffer from high optical gain thresholds due to valence band degeneracy.
  • This degeneracy leads to increased Auger recombination losses and limits laser applications by preventing steady-state lasing.

Purpose of the Study:

  • To reduce band-edge degeneracy and photoluminescence linewidth in CQDs.
  • To enable continuous-wave lasing in CQD solids through strain engineering.

Main Methods:

  • Developed a facet-selective epitaxy technique for CQDs.
  • Applied uniform biaxial strain by growing asymmetric compressive shells on wurtzite CdSe cores.
  • Ensured surface passivation to prevent non-radiative recombination losses.

Main Results:

  • Successfully decreased band-edge degeneracy and photoluminescence linewidth in CQDs.
  • Reduced optical gain thresholds and demonstrated continuous-wave lasing in CQD solids.
  • Achieved ultra-narrow single-dot linewidths, which were propagated to the ensemble.

Conclusions:

  • Facet-selective epitaxy and biaxial strain are effective for tuning CQD electronic properties.
  • This approach expands the library of solution-processed materials for continuous-wave laser applications.
  • The developed method offers a pathway to high-performance CQD-based optoelectronic devices.