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

doi:10.1021/nl500775p

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

Northwestern University, Argonne National Laboratory

Research output: Contribution to journal › Article

203 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 language	English
Pages (from-to)	2772-2777
Number of pages	6
Journal	Nano letters
Volume	14
Issue number	5
DOIs	https://doi.org/10.1021/nl500775p
Publication status	Published - May 14 2014

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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

Cite this

She, C., Fedin, I., Dolzhnikov, D. S., Demortière, A., Schaller, R. D., Pelton, M., & Talapin, D. V. (2014). Low-threshold stimulated emission using colloidal quantum wells. Nano letters, 14(5), 2772-2777. https://doi.org/10.1021/nl500775p

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AU - Fedin, Igor

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AU - Schaller, Richard D.

AU - Pelton, Matthew

AU - Talapin, Dmitri V.

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AB - 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.

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KW - colloidal quantum wells

KW - core/shell nanocrystals

KW - optical gain

KW - stimulated emission

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Access to Document

10.1021/nl500775p