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Asymmetrically strained quantum dots with non-fluctuating single-dot emission spectra and subthermal room-temperature linewidths

Nature Materials, ISSN: 1476-4660, Vol: 18, Issue: 3, Page: 249-255
2019
  • 115
    Citations
  • 0
    Usage
  • 124
    Captures
  • 15
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    115
  • Captures
    124
  • Mentions
    15
    • News Mentions
      12
      • 12
    • Blog Mentions
      3
      • Blog
        3

Most Recent News

Electrically driven amplified spontaneous emission from colloidal quantum dots

Nature, Published online: 03 May 2023; doi:10.1038/s41586-023-05855-6 Colloidal quantum dot devices demonstrating electrically pumped amplified spontaneous emission are described, showing strong, broadband optical gain and bright edge emission, opening the path to solution-processable laser diodes.

Article Description

The application of colloidal semiconductor quantum dots as single-dot light sources still requires several challenges to be overcome. Recently, there has been considerable progress in suppressing intensity fluctuations (blinking) by encapsulating an emitting core in a thick protective shell. However, these nanostructures still show considerable fluctuations in both emission energy and linewidth. Here we demonstrate type-I core/shell heterostructures that overcome these deficiencies. They are made by combining wurtzite semiconductors with a large, directionally anisotropic lattice mismatch, which results in strong asymmetric compression of the emitting core. This modifies the structure of band-edge excitonic states and leads to accelerated radiative decay, reduced exciton–phonon interactions, and suppressed coupling to the fluctuating electrostatic environment. As a result, individual asymmetrically strained dots exhibit highly stable emission energy (<1 meV standard deviation) and a subthermal room-temperature linewidth (~20 meV), concurrent with nearly nonblinking behaviour, high emission quantum yields, and a widely tunable emission colour.

Bibliographic Details

Park, Young-Shin; Lim, Jaehoon; Klimov, Victor I.

Springer Science and Business Media LLC

Chemistry; Materials Science; Physics and Astronomy; Engineering

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