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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots
Small, Volume 11, No. 13, Year 2015
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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. © 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
Authors & Co-Authors
Leontiadou, Marina A.
United Kingdom, Manchester
The University of Manchester
Lewis, Edward A.
United Kingdom, Manchester
The University of Manchester
Haigh, Sarah J.
United Kingdom, Manchester
The University of Manchester
Li, Chen
United States, Nashville
Vanderbilt University
United States, Oak Ridge
Oak Ridge National Laboratory
Radtke, Hanna
United Kingdom, Manchester
The University of Manchester
Pengpad, Atip
United Kingdom, Manchester
The University of Manchester
Bondino, Federica
Italy, Trieste
Laboratorio Nazionale Tasc
Magnano, Elena
Italy, Trieste
Laboratorio Nazionale Tasc
Pis, Igor
Italy, Trieste
Laboratorio Nazionale Tasc
Flavell, Wendy R.
United Kingdom, Manchester
The University of Manchester
O'Brien, Paul
United Kingdom, Manchester
The University of Manchester
David J. Binks, David J.
United Kingdom, Manchester
The University of Manchester
Statistics
Citations: 78
Authors: 12
Affiliations: 4
Identifiers
Doi:
10.1002/smll.201402264
ISSN:
16136810
Research Areas
Environmental