Recombination rates for single colloidal quantum dots near a smooth metal film

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https://pubs.rsc.org/en/content/articlelanding/2009/cp/b903053k

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https://doi.org/10.1039/B903053K
 http://hdl.handle.net/11603/29205

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UMBC Physics Department

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https://orcid.org/0000-0002-6370-8765

Date

2009-06-05

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journal articles
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Citation of Original Publication

Wu, Xiaohua, Yugang Sun, and Matthew Pelton. “Recombination Rates for Single Colloidal Quantum Dots near a Smooth Metal Film.” Physical Chemistry Chemical Physics 11, no. 28 (July 8, 2009): 5867–70. https://doi.org/10.1039/B903053K.

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This 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.
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Abstract

This paper presents experimental distributions of recombination rates for excitons in individual CdSe–ZnS core–shell quantum dots separated from a smooth gold film by a nanometre-scale dielectric layer. By measuring emission kinetics as a function of time, we obtain intrinsic recombination rates for single quantum dots. The distribution of recombination rates broadens and its maximum value increases as the separation between the dots and the metal decreases. The results agree with a semiclassical model that takes into account the randomly oriented two-dimensional dipole moments of the quantum dots.