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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

245 Scopus citations


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 (US)
Pages (from-to)2772-2777
Number of pages6
JournalNano letters
Issue number5
StatePublished - May 14 2014


  • 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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