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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Color in Coordination Complexes
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Colloidal-Quantum-Dot Ring Lasers with Active Color Control.

Boris le Feber1, Ferry Prins1, Eva De Leo1

  • 1Optical Materials Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich , 8092 Zurich, Switzerland.

Nano Letters
|December 29, 2017
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Summary
This summary is machine-generated.

Researchers developed novel quantum-dot ring lasers capable of switching colors. These lasers utilize core/shell quantum dots to achieve tunable emission for advanced laser applications.

Keywords:
Quantum-dot laserscolloidal quantum dotscore/shell nanocrystalsgiant-shell nanocrystalstemplate strippingultrafast switching

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Colloidal quantum dots (CQDs) with core/shell structures are crucial for laser applications.
  • Shells typically enhance core gain by isolating it and reducing recombination.
  • Shells may offer an additional gain medium, increasing material versatility.

Purpose of the Study:

  • To develop quantum-dot ring lasers exhibiting tunable lasing from both core and shell.
  • To demonstrate the ability to switch between core and shell lasing.
  • To explore the potential of core/shell CQDs as a secondary gain source.

Main Methods:

  • Fabrication of ring resonators using CdSe/CdS/ZnS core/shell/shell CQDs via template stripping.
  • Investigation of lasing properties as a function of optical excitation power and ring radius.
  • Development of a rate-equation model to explain observed lasing phenomena.

Main Results:

  • Achieved ring resonators with quality factors up to ~2500.
  • Observed red lasing from CdSe cores at ~25 μJ/cm² thresholds.
  • Demonstrated emergence of green lasing from CdS shell at >100 μJ/cm² and subsequent disappearance of red lasing at >250 μJ/cm².
  • Engineered devices for exclusive green lasing by reducing cavity quality factor.

Conclusions:

  • Demonstrated core/shell CQDs can act as dual gain media for tunable lasers.
  • Color switching is explained by exciton localization and stimulated emission competition.
  • This mechanism offers a pathway to color-switchable quantum-dot lasers.