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Two-photon-pumped lasing from colloidal nanocrystal quantum dots.

Chunfeng Zhang1, Fan Zhang, Ting Zhu

  • 1Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Optics Letters
|November 4, 2008
PubMed
Summary
This summary is machine-generated.

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Upconverted lasing was achieved in colloidal nanocrystal quantum dots (NQDs) for the first time. This breakthrough utilized two-photon absorption, enabling fast radiative recombination to overcome nonradiative processes in quantum dot lasers.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Dot Technology

Background:

  • Upconversion processes enable light emission at higher energies than absorbed light.
  • Nanocrystal quantum dots (NQDs) offer tunable optical properties.
  • Nonradiative recombination pathways, like Auger recombination, often limit NQD luminescence efficiency.

Purpose of the Study:

  • To demonstrate upconverted lasing in colloidal nanocrystal quantum dots (NQDs).
  • To investigate lasing in the nonlinear, two-photon absorption regime.
  • To understand the dynamics of radiative and nonradiative recombination in NQDs under specific excitation conditions.

Main Methods:

  • Fabrication of close-packed CdSe/CdS/ZnS core-shell nanocrystal quantum dots.
  • Excitation using pulsed lasers at sub-bandgap photon energies to induce two-photon absorption.

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Related Experiment Videos

Last Updated: Jun 28, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

  • Time-resolved photoluminescence spectroscopy to measure excited-state carrier dynamics.

    • Main Results:

    • Successful demonstration of upconverted lasing in colloidal NQDs for the first time.
    • Observation of fast radiative recombination of excitons, competing effectively with Auger recombination.
    • Measurement of a rapid decay time (approximately 7 ps) in time-resolved photoluminescence, confirming efficient radiative processes.

    Conclusions:

    • Colloidal nanocrystal quantum dots can support upconverted lasing via two-photon absorption.
    • Efficient radiative recombination is crucial for achieving lasing in NQDs by outcompeting Auger recombination.
    • These findings open new avenues for light generation and manipulation using NQD-based optical devices.