Nano Archive

Excitation wavelength dependence of fluorescence intermittency in CdSe/ZnS core/shell quantum' dots

Knappenberger, Kenneth L. and Wong, Daryl B. and Romanyuk, Yaroslav E. and Leone, Stephen R. (2007) Excitation wavelength dependence of fluorescence intermittency in CdSe/ZnS core/shell quantum' dots. NANO LETTERS, 7 (12). pp. 3869-3874.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl0714740

Abstract

Core/shell CdSe/ZnS quantum dot fluorescence-blinking statistics depend strongly on excitation wavelength. Excitation on the band gap (575 nm) results in inverse-power law ``on'' time distributions. However, distributions resulting from excitation above the band gap (525 nm) require a truncated power law and are 100 times less likely to display 10-s fluorescence. ``Off'' time statistics are insensitive to the excitation wavelength. The results may be explained by nonemissive trap states accessed with the higher-photon excitation energies.

Item Type:Article
Subjects:Physical Science > Photonics
ID Code:1854
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 11:31
Last Modified:16 Dec 2008 11:31

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