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Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots

Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe...

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Autores principales: Page, Robert C, Espinobarro-Velazquez, Daniel, Leontiadou, Marina A, Smith, Charles, Lewis, Edward A, Haigh, Sarah J, Li, Chen, Radtke, Hanna, Pengpad, Atip, Bondino, Federica, Magnano, Elena, Pis, Igor, Flavell, Wendy R, O'Brien, Paul, Binks, David J
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BlackWell Publishing Ltd 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4409856/
https://www.ncbi.nlm.nih.gov/pubmed/25348200
http://dx.doi.org/10.1002/smll.201402264
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author Page, Robert C
Espinobarro-Velazquez, Daniel
Leontiadou, Marina A
Smith, Charles
Lewis, Edward A
Haigh, Sarah J
Li, Chen
Radtke, Hanna
Pengpad, Atip
Bondino, Federica
Magnano, Elena
Pis, Igor
Flavell, Wendy R
O'Brien, Paul
Binks, David J
author_facet Page, Robert C
Espinobarro-Velazquez, Daniel
Leontiadou, Marina A
Smith, Charles
Lewis, Edward A
Haigh, Sarah J
Li, Chen
Radtke, Hanna
Pengpad, Atip
Bondino, Federica
Magnano, Elena
Pis, Igor
Flavell, Wendy R
O'Brien, Paul
Binks, David J
author_sort Page, Robert C
collection PubMed
description Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe CQDs is demonstrated that uses chloride ions to achieve near-complete suppression of surface trapping, resulting in an increase of photoluminescence (PL) quantum yield (QY) from ca. 5% to up to 97.2 ± 2.5%. The effect of the treatment is characterised by absorption and PL spectroscopy, PL decay, scanning transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. This process also dramatically improves the air-stability of the CQDs: before treatment the PL is largely quenched after 1 hour of air-exposure, whilst the treated samples showed a PL QY of nearly 50% after more than 12 hours.
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spelling pubmed-44098562015-04-29 Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots Page, Robert C Espinobarro-Velazquez, Daniel Leontiadou, Marina A Smith, Charles Lewis, Edward A Haigh, Sarah J Li, Chen Radtke, Hanna Pengpad, Atip Bondino, Federica Magnano, Elena Pis, Igor Flavell, Wendy R O'Brien, Paul Binks, David J Small Full Papers Colloidal quantum dots (CQDs) are promising materials for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Here a facile post-synthetic treatment of CdTe CQDs is demonstrated that uses chloride ions to achieve near-complete suppression of surface trapping, resulting in an increase of photoluminescence (PL) quantum yield (QY) from ca. 5% to up to 97.2 ± 2.5%. The effect of the treatment is characterised by absorption and PL spectroscopy, PL decay, scanning transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. This process also dramatically improves the air-stability of the CQDs: before treatment the PL is largely quenched after 1 hour of air-exposure, whilst the treated samples showed a PL QY of nearly 50% after more than 12 hours. BlackWell Publishing Ltd 2015-04 2014-10-27 /pmc/articles/PMC4409856/ /pubmed/25348200 http://dx.doi.org/10.1002/smll.201402264 Text en © 2014 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim http://creativecommons.org/licenses/by/4.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Page, Robert C
Espinobarro-Velazquez, Daniel
Leontiadou, Marina A
Smith, Charles
Lewis, Edward A
Haigh, Sarah J
Li, Chen
Radtke, Hanna
Pengpad, Atip
Bondino, Federica
Magnano, Elena
Pis, Igor
Flavell, Wendy R
O'Brien, Paul
Binks, David J
Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
title Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
title_full Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
title_fullStr Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
title_full_unstemmed Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
title_short Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
title_sort near-unity quantum yields from chloride treated cdte colloidal quantum dots
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4409856/
https://www.ncbi.nlm.nih.gov/pubmed/25348200
http://dx.doi.org/10.1002/smll.201402264
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