Dynamic fluctuations in ultrasmall nanocrystals induce white light emission

Nano Letters
Timothy J PennycookSokrates T Pantelides

Abstract

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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Citations

Oct 16, 2013·ACS Nano·James R McBrideSandra J Rosenthal
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Nov 27, 2018·Journal of the American Chemical Society·Masayuki NiheiHiroki Oshio

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