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Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots

[Image: see text] Bright and fast fluorescence makes semiconductor nanocrystals, or quantum dots (QDs), appealing for applications ranging from biomedical research to display screens. However, a few percent of their fluorescence intensity is surprisingly slow. Research into this “delayed emission” h...

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Autores principales: Hinterding, Stijn O. M., Vonk, Sander J. W., van Harten, Elleke J., Rabouw, Freddy T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7309328/
https://www.ncbi.nlm.nih.gov/pubmed/32459489
http://dx.doi.org/10.1021/acs.jpclett.0c01250
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author Hinterding, Stijn O. M.
Vonk, Sander J. W.
van Harten, Elleke J.
Rabouw, Freddy T.
author_facet Hinterding, Stijn O. M.
Vonk, Sander J. W.
van Harten, Elleke J.
Rabouw, Freddy T.
author_sort Hinterding, Stijn O. M.
collection PubMed
description [Image: see text] Bright and fast fluorescence makes semiconductor nanocrystals, or quantum dots (QDs), appealing for applications ranging from biomedical research to display screens. However, a few percent of their fluorescence intensity is surprisingly slow. Research into this “delayed emission” has been scarce, despite undesired consequences for some applications and potential opportunities for others. Here, we characterize the dynamics of delayed emission exhibited by individual CdSe/CdS core/shell QDs and correlate these with changes in the emission spectrum. The delayed-emission intensity from a single QD fluctuates strongly during an experiment of several minutes and is thus not always “on”, implying that control over delayed emission may be possible. Periods of bright delayed emission correlate with red-shifted emission spectra. This behavior is consistent with exciton polarization by fluctuating electric fields due to diffusing surface charges, which have been known to cause spectral diffusion in QDs. Our findings thus provide a stepping stone for future efforts to control delayed emission.
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spelling pubmed-73093282020-06-23 Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots Hinterding, Stijn O. M. Vonk, Sander J. W. van Harten, Elleke J. Rabouw, Freddy T. J Phys Chem Lett [Image: see text] Bright and fast fluorescence makes semiconductor nanocrystals, or quantum dots (QDs), appealing for applications ranging from biomedical research to display screens. However, a few percent of their fluorescence intensity is surprisingly slow. Research into this “delayed emission” has been scarce, despite undesired consequences for some applications and potential opportunities for others. Here, we characterize the dynamics of delayed emission exhibited by individual CdSe/CdS core/shell QDs and correlate these with changes in the emission spectrum. The delayed-emission intensity from a single QD fluctuates strongly during an experiment of several minutes and is thus not always “on”, implying that control over delayed emission may be possible. Periods of bright delayed emission correlate with red-shifted emission spectra. This behavior is consistent with exciton polarization by fluctuating electric fields due to diffusing surface charges, which have been known to cause spectral diffusion in QDs. Our findings thus provide a stepping stone for future efforts to control delayed emission. American Chemical Society 2020-05-27 2020-06-18 /pmc/articles/PMC7309328/ /pubmed/32459489 http://dx.doi.org/10.1021/acs.jpclett.0c01250 Text en Copyright © 2020 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
spellingShingle Hinterding, Stijn O. M.
Vonk, Sander J. W.
van Harten, Elleke J.
Rabouw, Freddy T.
Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots
title Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots
title_full Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots
title_fullStr Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots
title_full_unstemmed Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots
title_short Dynamics of Intermittent Delayed Emission in Single CdSe/CdS Quantum Dots
title_sort dynamics of intermittent delayed emission in single cdse/cds quantum dots
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7309328/
https://www.ncbi.nlm.nih.gov/pubmed/32459489
http://dx.doi.org/10.1021/acs.jpclett.0c01250
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