Photoluminescence quantum yield of PbS nanocrystals in colloidal suspensions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10314728" target="_blank" >RIV/00216208:11320/15:10314728 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1063/1.4917388" target="_blank" >http://dx.doi.org/10.1063/1.4917388</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.4917388" target="_blank" >10.1063/1.4917388</a>

Result language
angličtina
Original language name
Photoluminescence quantum yield of PbS nanocrystals in colloidal suspensions
Original language description
The absolute photoluminescence (PL) quantum yield (QY) of oleic acid-capped colloidal PbS quantum dots (QDs) in toluene is thoroughly investigated as function of QD size, concentration, excitation photon energy, and conditions of storage. We observed anomalous decrease of QY with decreasing concentration for highly diluted suspensions. The ligand desorption and QD-oxidation are demonstrated to be responsible for this phenomenon. Excess of oleic acid in suspensions makes the QY values concentration-independent over the entire reabsorption-free range. The PL emission is shown to be dominated by surface-related recombinations with some contribution from QD-core transitions. We demonstrate that QD colloidal suspension stability improves with increasing theconcentration and size of PbS QDs. (C) 2015 AIP Publishing LLC.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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