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Temporal correlation of blinking events in CdSe/ZnS and Si/SiO2 nanocrystals
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. University of Amsterdam, Netherlands .
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
University of Amsterdam, Netherlands .
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0002-5260-5322
2014 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 453, 63-67 p.Article in journal (Refereed) Published
Abstract [en]

Well passivated single Si/SiO2 nanoparticles obey mono exponential blinking statistics, whereas CdSe/ZnS quantum dots follow an apparent (truncated) power-law. Log-normal distributions are found to describe the interval length histograms at least as well as power-laws, while at the same time being more physically feasible and significantly easing the determination of the exponential cutoff in the ON-time distribution. The correlation of an ON- (OFF-)interval with its temporally displaced ON (OFF) neighbors, as well as that of intermixed intervals (ON with OFF and OFF with ON neighbors) has been studied. As expected from purely random processes, the correlation coefficients for events in silicon nanocrystals equal zero, whereas positive correlations between the pure and negative correlations between the mixed states in CdSe quantum dots hint at a switching process between two distinct blinking regimes that are slower than the blinking itself.

Place, publisher, year, edition, pages
2014. Vol. 453, 63-67 p.
Keyword [en]
Silicon, CdSe, Nanocrystal, Quantum dot, Blinking, Correlation
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-154736DOI: 10.1016/j.physb.2013.12.036ISI: 000342463400014Scopus ID: 2-s2.0-84907815789OAI: oai:DiVA.org:kth-154736DiVA: diva2:761167
Funder
Swedish Research Council
Note

QC 20141105

Available from: 2014-11-05 Created: 2014-10-27 Last updated: 2017-12-05Bibliographically approved

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Linnros, Jan

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