Journal of Physical Chemistry C, volume 113, issue 31, pages 13545-13550
Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots
Pengtao Jing
1
,
Jinju Zheng
1
,
Micho Ikezawa
1
,
Xueyan Liu
1
,
Shaozhe Lv
1
,
Xianggui Kong
1
,
Jingwen Zhao
1
,
YASUAKI MASUMOTO
1
Publication type: Journal Article
Publication date: 2009-07-10
Journal:
Journal of Physical Chemistry C
Q1
Q3
SJR: 0.957
CiteScore: 6.5
Impact factor: 3.3
ISSN: 19327447, 19327455
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
General Energy
Abstract
The photoluminescence (PL) spectra of CdSe-core CdS/CdZnS/ZnS-multishell quantum dots (QDs) were studied to understand the radiative and nonradiative relaxation processes in the temperature range from 80 to 360 K. The mechanism of temperature-dependent nonradiative relaxation processes in the CdSe QDs with changing the shell structures was found to evolve from thermal activation of carrier trapping by surface defects/traps in CdSe core QDs to the multiple longitudinal-optical (LO) phonon-assisted thermal escape of carriers in the core/shell QDs. An increase in PL intensity with increasing temperature was clearly observed in the core/shell QDs with a thick CdS monoshell and a CdS/ZnCdS/ZnS multishell. The PL enhancement was considered to come from delocalization of charge carriers localized at the CdSe/CdS interface with the potential depth of ∼30 meV. The experimental results indicated that the improvement of PL quantum efficiency in CdSe-core CdS/CdZnS/ZnS-multishell QDs could be understood in terms of the reduction of nonradiative recombination centers at the interfaces and on the surface of the multishell, as well as the confinement of electrons and holes into the QDs by an outer ZnS shell.
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Jing P. et al. Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots // Journal of Physical Chemistry C. 2009. Vol. 113. No. 31. pp. 13545-13550.
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Jing P., Zheng J., Ikezawa M., Liu X., Lv S., Kong X., Zhao J., MASUMOTO Y. Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots // Journal of Physical Chemistry C. 2009. Vol. 113. No. 31. pp. 13545-13550.
Cite this
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TY - JOUR
DO - 10.1021/jp902080p
UR - https://doi.org/10.1021/jp902080p
TI - Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots
T2 - Journal of Physical Chemistry C
AU - Jing, Pengtao
AU - Zheng, Jinju
AU - Ikezawa, Micho
AU - Liu, Xueyan
AU - Lv, Shaozhe
AU - Kong, Xianggui
AU - Zhao, Jingwen
AU - MASUMOTO, YASUAKI
PY - 2009
DA - 2009/07/10
PB - American Chemical Society (ACS)
SP - 13545-13550
IS - 31
VL - 113
SN - 1932-7447
SN - 1932-7455
ER -
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@article{2009_Jing,
author = {Pengtao Jing and Jinju Zheng and Micho Ikezawa and Xueyan Liu and Shaozhe Lv and Xianggui Kong and Jingwen Zhao and YASUAKI MASUMOTO},
title = {Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots},
journal = {Journal of Physical Chemistry C},
year = {2009},
volume = {113},
publisher = {American Chemical Society (ACS)},
month = {jul},
url = {https://doi.org/10.1021/jp902080p},
number = {31},
pages = {13545--13550},
doi = {10.1021/jp902080p}
}
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Jing, Pengtao, et al. “Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots.” Journal of Physical Chemistry C, vol. 113, no. 31, Jul. 2009, pp. 13545-13550. https://doi.org/10.1021/jp902080p.