Violet-to-Blue Gain and Lasing from Colloidal CdS Nanoplatelets: Low-Threshold Stimulated Emission Despite Low Photoluminescence Quantum Yield

Benjamin T. Diroll, Dmitri V. Talapin, Richard D Schaller

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Amplified spontaneous emission (ASE) and lasing from solution-processed materials are demonstrated in the challenging violet-to-blue (430-490 nm) spectral region for colloidal nanoplatelets of CdS and newly synthesized core/shell CdS/ZnS nanoplatelets. Despite modest band-edge photoluminescence quantum yields of 2% or less for single excitons, which we show results from hole trapping, the samples exhibit low ASE thresholds. Furthermore, four-monolayer CdS samples show ASE at shorter wavelengths than any reported film of colloidal quantum-confined material. This work underlines that low quantum yields for single excitons do not necessarily lead to a poor gain medium. The low ASE thresholds originate from negligible dispersion in thickness, large absorption cross sections of 2.8 × 10-14 cm-2, and rather slow (150 to 300 ps) biexciton recombination. We show that under higher-fluence excitation, ASE can kinetically outcompete hole trapping. Using nanoplatelets as the gain medium, lasing is observed in a linear optical cavity. This work confirms the fundamental advantages of colloidal quantum well structures as gain media, even in the absence of high photoluminescence efficiency.

Original languageEnglish
Pages (from-to)576-583
Number of pages8
JournalACS Photonics
Volume4
Issue number3
DOIs
Publication statusPublished - Mar 15 2017

Fingerprint

Viola
Stimulated emission
Spontaneous emission
Quantum yield
stimulated emission
spontaneous emission
lasing
Photoluminescence
photoluminescence
thresholds
Genetic Recombination
Excitons
trapping
excitons
absorption cross sections
Semiconductor quantum wells
Monolayers
fluence
LDS 751
quantum wells

Keywords

  • amplified spontaneous emission
  • CdS
  • lasing
  • quantum wells
  • trapping

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Violet-to-Blue Gain and Lasing from Colloidal CdS Nanoplatelets : Low-Threshold Stimulated Emission Despite Low Photoluminescence Quantum Yield. / Diroll, Benjamin T.; Talapin, Dmitri V.; Schaller, Richard D.

In: ACS Photonics, Vol. 4, No. 3, 15.03.2017, p. 576-583.

Research output: Contribution to journalArticle

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