Red, Yellow, Green, and Blue Amplified Spontaneous Emission and Lasing Using Colloidal CdSe Nanoplatelets

Chunxing She, Igor Fedin, Dmitriy S. Dolzhnikov, Peter D. Dahlberg, Gregory S. Engel, Richard D. Schaller, Dmitri V. Talapin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

230 Scopus citations


There have been multiple demonstrations of amplified spontaneous emission (ASE) and lasing using colloidal semiconductor nanocrystals. However, it has been proven difficult to achieve low thresholds suitable for practical use of nanocrystals as gain media. Low-threshold blue ASE and lasing from nanocrystals is an even more challenging task. Here, we show that colloidal nanoplatelets (NPLs) with electronic structure of quantum wells can produce ASE in the red, yellow, green, and blue regions of the visible spectrum with low thresholds and high gains. In particular, for blue-emitting NPLs, the ASE threshold is 50 μJ/cm2, lower than any reported value for nanocrystals. We then demonstrate red, yellow, green, and blue lasing using NPLs with different thicknesses. We find that the lateral size of NPLs does not show any strong effect on the Auger recombination rates and, correspondingly, on the ASE threshold or gain saturation. This observation highlights the qualitative difference of multiexciton dynamics in CdSe NPLs and other quantum-confined CdSe materials, such as quantum dots and rods. Our measurements of the gain bandwidth and gain lifetime further support the prospects of colloidal NPLs as solution-processed optical gain materials.

Original languageEnglish (US)
Pages (from-to)9475-9485
Number of pages11
JournalACS nano
Issue number10
StatePublished - Oct 27 2015


  • Auger recombination
  • amplified spontaneous emission
  • lasing
  • nanoplatelets
  • optical gain
  • semiconductor nanocrystals

ASJC Scopus subject areas

  • General Engineering
  • General Materials Science
  • General Physics and Astronomy


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