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Microsecond-sustained lasing from colloidal quantum dot solids

Author

Listed:
  • Michael M. Adachi

    (University of Toronto)

  • Fengjia Fan

    (University of Toronto)

  • Daniel P. Sellan

    (University of Toronto)

  • Sjoerd Hoogland

    (University of Toronto)

  • Oleksandr Voznyy

    (University of Toronto)

  • Arjan J. Houtepen

    (Optoelectronic Materials Section, Delft University of Technology)

  • Kevin D. Parrish

    (Carnegie Mellon University)

  • Pongsakorn Kanjanaboos

    (University of Toronto
    Present address: Materials Science and Engineering, Faculty of Science, Mahidol University, 272 Rama 6 Road, Ratchathewi District, Bangkok 10400, Thailand)

  • Jonathan A. Malen

    (Carnegie Mellon University
    Carnegie Mellon University)

  • Edward H. Sargent

    (University of Toronto)

Abstract

Colloidal quantum dots have grown in interest as materials for light amplification and lasing in view of their bright photoluminescence, convenient solution processing and size-controlled spectral tunability. To date, lasing in colloidal quantum dot solids has been limited to the nanosecond temporal regime, curtailing their application in systems that require more sustained emission. Here we find that the chief cause of nanosecond-only operation has been thermal runaway: the combination of rapid heat injection from the pump source, poor heat removal and a highly temperature-dependent threshold. We show microsecond-sustained lasing, achieved by placing ultra-compact colloidal quantum dot films on a thermally conductive substrate, the combination of which minimizes heat accumulation. Specifically, we employ inorganic-halide-capped quantum dots that exhibit high modal gain (1,200 cm−1) and an ultralow amplified spontaneous emission threshold (average peak power of ∼50 kW cm−2) and rely on an optical structure that dissipates heat while offering minimal modal loss.

Suggested Citation

  • Michael M. Adachi & Fengjia Fan & Daniel P. Sellan & Sjoerd Hoogland & Oleksandr Voznyy & Arjan J. Houtepen & Kevin D. Parrish & Pongsakorn Kanjanaboos & Jonathan A. Malen & Edward H. Sargent, 2015. "Microsecond-sustained lasing from colloidal quantum dot solids," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9694
    DOI: 10.1038/ncomms9694
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