期刊
ACS NANO
卷 9, 期 10, 页码 9475-9485出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02509
关键词
nanoplatelets; semiconductor nanocrystals; Auger recombination; optical gain; amplified spontaneous emission; lasing
类别
资金
- Air Force Office of Scientific Research [FA9550-14-1-0367]
- University of Chicago NSF MRSEC [DMR-14-20703]
- II-VI Foundation
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NSF GRFP
- University of Chicago (NIH) [T32 Eb009412]
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 mu J/cm(2), 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.
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