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    Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots

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    Type
    Article
    Authors
    Voznyy, O.
    Sargent, E. H.
    KAUST Grant Number
    KUS-11-009-21
    Date
    2014-04-16
    Permanent link to this record
    http://hdl.handle.net/10754/597631
    
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    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.
    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.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review Letters
    DOI
    10.1103/PhysRevLett.112.157401
    PubMed ID
    24785069
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevLett.112.157401
    Scopus Count
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