Michael M. AdachiFengjia FanDaniel P. SellanSjoerd HooglandOleksandr VoznyyArjan J. HoutepenKevin D. ParrishPongsakorn KanjanaboosJonathan A. MalenEdward H. SargentUniversity of TorontoDelft University of TechnologyCarnegie Mellon UniversityMahidol University2018-11-232018-11-232015-10-23Nature Communications. Vol.6, (2015)204117232-s2.0-84945272291https://repository.li.mahidol.ac.th/handle/123456789/35360© 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.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyChemistryArticleSCOPUS10.1038/ncomms9694