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Updated: Jul 10, 2026

Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Excitation wavelength dependence of fluorescence intermittency in CdSe/ZnS core/shell quantum dots
Kenneth L Knappenberger1, Daryl B Wong, Yaroslav E Romanyuk
1Department 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.
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