Low-threshold stimulated emission using colloidal quantum wells

Chunxing She, Igor Fedin, Dmitriy S. Dolzhnikov, Arnaud Demortière, Richard D. Schaller, Matthew Pelton, Dmitri V. Talapin

Research output: Contribution to journalArticlepeer-review

227 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2772-2777
Number of pages6
JournalNano letters
Volume14
Issue number5
DOIs
Publication statusPublished - May 14 2014

Keywords

  • Nanoplatelets
  • colloidal quantum wells
  • core/shell nanocrystals
  • optical gain
  • stimulated emission

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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