Evidence for a diffusion-controlled mechanism for fluorescence blinking of colloidal quantum dots

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dc.contributor.authorPelton, Matthew
dc.contributor.authorSmith, Glenna
dc.contributor.authorScherer, Norbert F.
dc.contributor.authorMarcus, Rudolph A.
dc.date.accessioned2023-08-14T20:09:07Z
dc.date.available2023-08-14T20:09:07Z
dc.date.issued2007-09-04
dc.description.abstractFluorescence blinking in nanocrystal quantum dots is known to exhibit power-law dynamics, and several different mechanisms have been proposed to explain this behavior. We have extended the measurement of quantum-dot blinking by characterizing fluctuations in the fluorescence of single dots over time scales from microseconds to seconds. The power spectral density of these fluctuations indicates a change in the power-law statistics that occurs at a time scale of several milliseconds, providing an important constraint on possible mechanisms for the blinking. In particular, the observations are consistent with the predictions of models wherein blinking is controlled by diffusion of the energies of electron or hole trap states.en
dc.description.sponsorshipWe thank Prof. Philippe Guyot-Sionnest for providing the QD samples and for valuable discussions, and Dr. Pavel Frantsuzov for helpful comments. This work was partially funded by National Science Foundation Grant CHE-0616663 (to N.F.S.), National Institutes of Health Grant R01GM67961 (to N.F.S.). The Center for Nanoscale Materials is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Contract DE-AC02-06CH11357. R.A.M. thanks the Office of Naval Research and the National Science Foundation for support. N.F.S. acknowledges the J. S. Guggenheim Foundation for a fellowship.en
dc.description.urihttps://www.pnas.org/doi/10.1073/pnas.0706164104en
dc.format.extent6 pagesen
dc.genrejournal articlesen
dc.identifierdoi:10.13016/m2er3c-yzij
dc.identifier.citationPelton, Matthew, Glenna Smith, Norbert F. Scherer, and Rudolph A. Marcus. “Evidence for a Diffusion-Controlled Mechanism for Fluorescence Blinking of Colloidal Quantum Dots.” Proceedings of the National Academy of Sciences 104, no. 36 (September 4, 2007): 14249–54. https://doi.org/10.1073/pnas.0706164104.en
dc.identifier.urihttps://doi.org/10.1073/pnas.0706164104
dc.identifier.urihttp://hdl.handle.net/11603/29220
dc.language.isoenen
dc.publisherPNASen
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleEvidence for a diffusion-controlled mechanism for fluorescence blinking of colloidal quantum dotsen
dc.typeTexten
dcterms.creatorhttps://orcid.org/0000-0002-6370-8765en

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