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Title: Microsecond-sustained lasing from colloidal quantum dot solids
Authors: 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
University of Toronto
Delft University of Technology
Carnegie Mellon University
Mahidol University
Keywords: Biochemistry, Genetics and Molecular Biology;Chemistry
Issue Date: 23-Oct-2015
Citation: Nature Communications. Vol.6, (2015)
Abstract: © 2015 Macmillan Publishers Limited. All rights reserved. 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.
ISSN: 20411723
Appears in Collections:Scopus 2011-2015

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