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Two-band optical gain and ultrabright electroluminescence from colloidal quantum dots at 1000 A cm−2

Author

Listed:
  • Heeyoung Jung

    (Los Alamos National Laboratory)

  • Young-Shin Park

    (Los Alamos National Laboratory
    University of New Mexico)

  • Namyoung Ahn

    (Los Alamos National Laboratory)

  • Jaehoon Lim

    (Los Alamos National Laboratory
    Sungkyunkwan University, Natural Sciences Campus)

  • Igor Fedin

    (Los Alamos National Laboratory)

  • Clément Livache

    (Los Alamos National Laboratory)

  • Victor I. Klimov

    (Los Alamos National Laboratory)

Abstract

Colloidal quantum dots (QDs) are attractive materials for the realization of solution-processable laser diodes. Primary challenges towards this objective are fast optical-gain relaxation due to nonradiative Auger recombination and poor stability of colloidal QD solids under high current densities required to obtain optical gain. Here we resolve these challenges and achieve broad-band optical gain spanning the band-edge (1S) and the higher-energy (1P) transitions. This demonstration is enabled by continuously graded QDs with strongly suppressed Auger recombination and a current-focusing device design, combined with short-pulse pumping. Using this approach, we achieve ultra-high current densities (~1000 A cm−2) and brightness (~10 million cd m−2), and demonstrate an unusual two-band electroluminescence regime for which the 1P band is more intense than the 1S feature. This implies the realization of extremely large QD occupancies of up to ~8 excitons per-dot, which corresponds to complete filling of the 1S and 1P electron shells.

Suggested Citation

  • Heeyoung Jung & Young-Shin Park & Namyoung Ahn & Jaehoon Lim & Igor Fedin & Clément Livache & Victor I. Klimov, 2022. "Two-band optical gain and ultrabright electroluminescence from colloidal quantum dots at 1000 A cm−2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31189-4
    DOI: 10.1038/s41467-022-31189-4
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    References listed on IDEAS

    as
    1. Victor I. Klimov & Sergei A. Ivanov & Jagjit Nanda & Marc Achermann & Ilya Bezel & John A. McGuire & Andrei Piryatinski, 2007. "Single-exciton optical gain in semiconductor nanocrystals," Nature, Nature, vol. 447(7143), pages 441-446, May.
    2. Fengjia Fan & Oleksandr Voznyy & Randy P. Sabatini & Kristopher T. Bicanic & Michael M. Adachi & James R. McBride & Kemar R. Reid & Young-Shin Park & Xiyan Li & Ankit Jain & Rafael Quintero-Bermudez &, 2017. "Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy," Nature, Nature, vol. 544(7648), pages 75-79, April.
    3. Jeongkyun Roh & Young-Shin Park & Jaehoon Lim & Victor I. Klimov, 2020. "Optically pumped colloidal-quantum-dot lasing in LED-like devices with an integrated optical cavity," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
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