Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots

Handle URI:
http://hdl.handle.net/10754/597631
Title:
Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots
Authors:
Voznyy, O.; Sargent, E. H.
Abstract:
Optoelectronic applications of colloidal quantum dots demand a high emission efficiency, stability in time, and narrow spectral bandwidth. Electronic trap states interfere with the above properties but understanding of their origin remains lacking, inhibiting the development of robust passivation techniques. Here we show that surface vacancies improve the fluorescence yield compared to vacancy-free surfaces, while dynamic vacancy aggregation can temporarily turn fluorescence off. We find that infilling with foreign cations can stabilize the vacancies, inhibiting intermittency and improving quantum yield, providing an explanation of recent experimental observations. © 2014 American Physical Society.
Citation:
Voznyy O, Sargent EH (2014) Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots. Physical Review Letters 112. Available: http://dx.doi.org/10.1103/PhysRevLett.112.157401.
Publisher:
American Physical Society (APS)
Journal:
Physical Review Letters
KAUST Grant Number:
KUS-11-009-21
Issue Date:
16-Apr-2014
DOI:
10.1103/PhysRevLett.112.157401
PubMed ID:
24785069
Type:
Article
ISSN:
0031-9007; 1079-7114
Sponsors:
We thank Jonathan Owen and Joost VandeVondele for fruitful discussions. This publication is based in part on work supported by Grant No. KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. Computations were performed on the BlueGene/Q supercomputer at the SciNet HPC Consortium provided through the Southern Ontario Smart Computing Innovation Platform (SOSCIP). The SOSCIP multi-university/industry consortium is funded by the Ontario Government and the Federal Economic Development Agency for Southern Ontario.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorVoznyy, O.en
dc.contributor.authorSargent, E. H.en
dc.date.accessioned2016-02-25T12:43:23Zen
dc.date.available2016-02-25T12:43:23Zen
dc.date.issued2014-04-16en
dc.identifier.citationVoznyy O, Sargent EH (2014) Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots. Physical Review Letters 112. Available: http://dx.doi.org/10.1103/PhysRevLett.112.157401.en
dc.identifier.issn0031-9007en
dc.identifier.issn1079-7114en
dc.identifier.pmid24785069en
dc.identifier.doi10.1103/PhysRevLett.112.157401en
dc.identifier.urihttp://hdl.handle.net/10754/597631en
dc.description.abstractOptoelectronic applications of colloidal quantum dots demand a high emission efficiency, stability in time, and narrow spectral bandwidth. Electronic trap states interfere with the above properties but understanding of their origin remains lacking, inhibiting the development of robust passivation techniques. Here we show that surface vacancies improve the fluorescence yield compared to vacancy-free surfaces, while dynamic vacancy aggregation can temporarily turn fluorescence off. We find that infilling with foreign cations can stabilize the vacancies, inhibiting intermittency and improving quantum yield, providing an explanation of recent experimental observations. © 2014 American Physical Society.en
dc.description.sponsorshipWe thank Jonathan Owen and Joost VandeVondele for fruitful discussions. This publication is based in part on work supported by Grant No. KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. Computations were performed on the BlueGene/Q supercomputer at the SciNet HPC Consortium provided through the Southern Ontario Smart Computing Innovation Platform (SOSCIP). The SOSCIP multi-university/industry consortium is funded by the Ontario Government and the Federal Economic Development Agency for Southern Ontario.en
dc.publisherAmerican Physical Society (APS)en
dc.titleAtomistic Model of Fluorescence Intermittency of Colloidal Quantum Dotsen
dc.typeArticleen
dc.identifier.journalPhysical Review Lettersen
dc.contributor.institutionUniversity of Toronto, Toronto, Canadaen
kaust.grant.numberKUS-11-009-21en

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