期刊
NANO LETTERS
卷 12, 期 6, 页码 3038-3042出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3008727
关键词
Nanocrystals; quantum dots; fluxionality; scanning transmission electron microscopy; density functional theory
类别
资金
- U.S. Department of Energy [DE-FG02-09ER46554]
- McMinn Endowment
- National Science Foundation [EPS 1004083]
- EPSCoR
- Office Of The Director [1004083] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-09ER46554] Funding Source: U.S. Department of Energy (DOE)
Individual ultrasmall CdSe nanocrystals have recently been found to emit white light, but the ultimate origin of the phenomenon has remained elusive. Here we use a combination of state-of-the-art experiment and theory to show that excitation sets the ultrasmall nanocrystals into a fluxional state. Their energy gaps vary continuously on a femtosecond time scale, so that even an individual nanocrystal can emit across the entire visual range. In addition, we observe the outer layers of the larger monochromatic emitting nanocrystals to be fluxional. Such fluxionality should be considered when optimizing nanocrystals for applications. Thus, small is indeed different, but ultrasmall is different yet again.
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