Low-Threshold Stimulated Emission Using Colloidal Quantum Wells





Citation of Original Publication

She, Chunxing, Igor Fedin, Dmitriy S. Dolzhnikov, Arnaud Demortière, Richard D. Schaller, Matthew Pelton, and Dmitri V. Talapin. “Low-Threshold Stimulated Emission Using Colloidal Quantum Wells.” Nano Letters 14, no. 5 (May 14, 2014): 2772–77. https://doi.org/10.1021/nl500775p.


This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Nano Letters, copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/nl500775p.



The use of colloidal semiconductor nanocrystals for optical amplification and lasing has been limited by the need for high input power densities. Here we show that colloidal nanoplatelets produce amplified spontaneous emission with thresholds as low as 6 μJ/cm² and gain as high as 600 cm⁻¹, both a significant improvement over colloidal nanocrystals; in addition, gain saturation occurs at pump fluences 2 orders of magnitude higher than the threshold. We attribute this exceptional performance to large optical cross-sections, slow Auger recombination rates, and narrow ensemble emission line widths.