期刊
NANO LETTERS
卷 14, 期 5, 页码 2772-2777出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl500775p
关键词
Nanoplatelets; core/shell nanocrystals; stimulated emission; colloidal quantum wells; optical gain
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Keck Foundation
- University of Chicago
- Department of Energy under Department of Energy [DE-AC02-06CH11357]
- David and Lucile Packard Fellowship
- Samsung Global Research Outreach Program
- University of Chicago NSF MRSEC Program [DMR-0213745]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
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 mu J/cm(2) 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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