Journal of Chemical Physics, volume 115, issue 2, pages 1028-1040

``On''/``off'' fluorescence intermittency of single semiconductor quantum dots

M Kuno 1, 2
D. P. Fromm 1, 2
H.F. Hamann 1, 2
A. Gallagher 1, 2
D J Nesbitt 1, 2
2
 
Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0440
Publication typeJournal Article
Publication date2001-07-08
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor4.4
ISSN00219606, 10897690
Physical and Theoretical Chemistry
General Physics and Astronomy
Abstract

Single molecule confocal microscopy is used to investigate the detailed kinetics of fluorescence intermittency in colloidal II–VI (CdSe) semiconductor quantum dots. Two distinct modes of behavior are observed corresponding to (i) sustained “on” episodes (τon) of rapid laser absorption/fluorescence cycling, followed by (ii) sustained “off” episodes (τoff) where essentially no light is emitted despite continuous laser excitation. Both on-time and off-time probability densities follow an inverse power law, P(τon/off)∝1/τon/offm, over more than seven decades in probability density and five decades in time. Such inverse power law behavior is an unambiguous signature of highly distributed kinetics with rates varying over 105-fold, in contrast with models for switching between “on” and “off” configurations of the system via single rate constant processes. The unprecedented dynamic range of the current data permits several kinetic models of fluorescence intermittency to be evaluated at the single molecule level and indicate the importance of fluctuations in the quantum dot environment.

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Kuno M. et al. ``On''/``off'' fluorescence intermittency of single semiconductor quantum dots // Journal of Chemical Physics. 2001. Vol. 115. No. 2. pp. 1028-1040.
GOST all authors (up to 50) Copy
Kuno M., Fromm D. P., Hamann H., Gallagher A., Nesbitt D. J. ``On''/``off'' fluorescence intermittency of single semiconductor quantum dots // Journal of Chemical Physics. 2001. Vol. 115. No. 2. pp. 1028-1040.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1063/1.1377883
UR - https://doi.org/10.1063/1.1377883
TI - ``On''/``off'' fluorescence intermittency of single semiconductor quantum dots
T2 - Journal of Chemical Physics
AU - Kuno, M
AU - Fromm, D. P.
AU - Hamann, H.F.
AU - Gallagher, A.
AU - Nesbitt, D J
PY - 2001
DA - 2001/07/08 00:00:00
PB - American Institute of Physics (AIP)
SP - 1028-1040
IS - 2
VL - 115
SN - 0021-9606
SN - 1089-7690
ER -
BibTex |
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BibTex Copy
@article{2001_Kuno,
author = {M Kuno and D. P. Fromm and H.F. Hamann and A. Gallagher and D J Nesbitt},
title = {``On''/``off'' fluorescence intermittency of single semiconductor quantum dots},
journal = {Journal of Chemical Physics},
year = {2001},
volume = {115},
publisher = {American Institute of Physics (AIP)},
month = {jul},
url = {https://doi.org/10.1063/1.1377883},
number = {2},
pages = {1028--1040},
doi = {10.1063/1.1377883}
}
MLA
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Kuno, M., et al. “``On''/``off'' fluorescence intermittency of single semiconductor quantum dots.” Journal of Chemical Physics, vol. 115, no. 2, Jul. 2001, pp. 1028-1040. https://doi.org/10.1063/1.1377883.
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