Atomistic Model of Fluorescence Intermittency of Colloidal Quantum Dots
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ArticleAuthors
Voznyy, O.Sargent, E. H.
KAUST Grant Number
KUS-11-009-21Date
2014-04-16Permanent link to this record
http://hdl.handle.net/10754/597631
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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 LettersPubMed ID
24785069ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevLett.112.157401
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