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      Continuous-wave biexciton lasing at room temperature using solution-processed quantum wells.

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          Abstract

          Solution-processed inorganic and organic materials have been pursued for more than a decade as low-threshold, high-gain lasing media, motivated in large part by their tunable optoelectronic properties and ease of synthesis and processing. Although both have demonstrated stimulated emission and lasing, they have not yet approached the continuous-wave pumping regime. Two-dimensional CdSe colloidal nanosheets combine the advantage of solution synthesis with the optoelectronic properties of epitaxial two-dimensional quantum wells. Here, we show that these colloidal quantum wells possess large exciton and biexciton binding energies of 132 meV and 30 meV, respectively, giving rise to stimulated emission from biexcitons at room temperature. Under femtosecond pulsed excitation, close-packed thin films yield an ultralow stimulated emission threshold of 6 μJ cm(-2), sufficient to achieve continuous-wave pumped stimulated emission, and lasing when these layers are embedded in surface-emitting microcavities.

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          Author and article information

          Journal
          Nat Nanotechnol
          Nature nanotechnology
          1748-3395
          1748-3387
          Nov 2014
          : 9
          : 11
          Affiliations
          [1 ] Istituto Italiano di Tecnologia, via Morego 30, IT-16163 Genova, Italy.
          Article
          nnano.2014.213
          10.1038/nnano.2014.213
          25282045
          5208a43f-252f-4be7-8508-b73c2663b7c0
          History

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