Physical Review B, volume 71, issue 23, publication number 235409

Temperature dependence of the photoluminescence properties of colloidalCdSeZnScore/shell quantum dots embedded in a polystyrene matrix

Publication typeJournal Article
Publication date2005-06-13
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor3.7
ISSN24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Abstract
We report on the temperature dependence of the photoluminescence (PL) spectrum and of the PL relaxation dynamics for colloidal $\mathrm{Cd}\mathrm{Se}∕\mathrm{Zn}\mathrm{S}$ core/shell quantum dots (QDs) embedded in an inert polystyrene matrix. We demonstrate that the confinement energy in the QDs is independent of the temperature. The coupling with both acoustic and optical phonons is also studied. Quantum confinement results in a strong increase of the exciton--acoustic-phonon coupling constant, up to $71\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{eV}∕\mathrm{K}$, and in a reduced exciton--longitudinal-optical (LO)-phonon coupling constant, down to $21\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$, with respect to bulk CdSe. In addition, we demonstrate that the main nonradiative process that limits the quantum efficiency of the QD at room temperature is the thermal escape from the dot assisted by scattering with four LO phonons. Thermally activated trapping in surface states is also observed at low temperature, with an activation energy of about $15\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$.

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Valerini D. et al. Temperature dependence of the photoluminescence properties of colloidalCdSe∕ZnScore/shell quantum dots embedded in a polystyrene matrix // Physical Review B. 2005. Vol. 71. No. 23. 235409
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Valerini D., Cretí A., Cretí A., Lomascolo M., Manna L., Cingolani R., Anni M., Anni M. Temperature dependence of the photoluminescence properties of colloidalCdSe∕ZnScore/shell quantum dots embedded in a polystyrene matrix // Physical Review B. 2005. Vol. 71. No. 23. 235409
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RIS Copy
TY - JOUR
DO - 10.1103/physrevb.71.235409
UR - https://doi.org/10.1103/physrevb.71.235409
TI - Temperature dependence of the photoluminescence properties of colloidalCdSe∕ZnScore/shell quantum dots embedded in a polystyrene matrix
T2 - Physical Review B
AU - Valerini, D.
AU - Cretí, A
AU - Lomascolo, M.
AU - Manna, L.
AU - Cingolani, R
AU - Anni, M.
AU - Cretí, Arianna
AU - Anni, M
PY - 2005
DA - 2005/06/13 00:00:00
PB - American Physical Society (APS)
IS - 23
VL - 71
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
BibTex
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BibTex Copy
@article{2005_Valerini,
author = {D. Valerini and A Cretí and M. Lomascolo and L. Manna and R Cingolani and M. Anni and Arianna Cretí and M Anni},
title = {Temperature dependence of the photoluminescence properties of colloidalCdSe∕ZnScore/shell quantum dots embedded in a polystyrene matrix},
journal = {Physical Review B},
year = {2005},
volume = {71},
publisher = {American Physical Society (APS)},
month = {jun},
url = {https://doi.org/10.1103/physrevb.71.235409},
number = {23},
doi = {10.1103/physrevb.71.235409}
}
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