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Nano Lett. 2007 Dec;7(12):3869-74. Epub 2007 Nov 10.

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

Author information

1
Department of Chemistry, University of California and Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

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.

PMID:
17994781
DOI:
10.1021/nl0714740
[Indexed for MEDLINE]

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