Nano Letters, volume 19, issue 12, pages 8519-8525
Intrinsic Exciton Photophysics of PbS Quantum Dots Revealed by Low-Temperature Single Nanocrystal Spectroscopy
Zhongjian Hu
1
,
Younghee Kim
1
,
Sachidananda Krishnamurthy
1, 2
,
I. D. Avdeev
3
,
M. O. Nestoklon
3
,
Ajay Singh
1
,
A. Malko
2
,
Serguei Goupalov
3, 4
,
Jennifer A. Hollingsworth
1
,
Han Htoon
1
2
4
Department of Physics, Jackson State University, Jackson, Mississippi 39217, United States
|
Publication type: Journal Article
Publication date: 2019-11-12
Journal:
Nano Letters
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 10.8
ISSN: 15306984, 15306992
General Chemistry
Condensed Matter Physics
General Materials Science
Mechanical Engineering
Bioengineering
Abstract
With a tunable size-dependent photoluminescence (PL) over a wide infrared wavelength range, lead chalcogenide quantum dots (QDs) have attracted significant scientific and technological interest. Nevertheless, the investigation of intrinsic exciton photophysics at the single-QD level has remained a challenge. Herein, we present a comprehensive study of PL properties for the individual core/shell PbS/CdS QDs emissive near 1.0 eV. In contrast to the sub-meV spectral line widths observed for II/VI QDs, PbS/CdS QDs are predicted to possess broad homogeneous line widths. Performing spectroscopy at cryogenic (4 K) temperatures, we provide direct evidence confirming theoretical predictions, showing that intrinsic line widths for PbS/CdS QDs are in the range of 8-25 meV, with an average of 16.4 meV. In addition, low-temperature, single-QD spectroscopy reveals a broad low-energy side emission attributable to optical as well as localized acoustic phonon-assisted transitions. By tracking single QDs from 4 to 250 K, we were able to probe temperature-dependent evolutions of emission energy, line width, and line shape. Finally, polarization-resolved PL imaging showed that PbS/CdS QDs are characterized by a 3D emission dipole, in contrast with the 2D dipole observed for CdSe QDs.
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Citations by publishers
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6 publications, 42.86%
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2 publications, 14.29%
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1 publication, 7.14%
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1 publication, 7.14%
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1 publication, 7.14%
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1 publication, 7.14%
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- We do not take into account publications without a DOI.
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- Statistics recalculated weekly.
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Hu Z. et al. Intrinsic Exciton Photophysics of PbS Quantum Dots Revealed by Low-Temperature Single Nanocrystal Spectroscopy // Nano Letters. 2019. Vol. 19. No. 12. pp. 8519-8525.
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Hu Z., Kim Y., Krishnamurthy S., Avdeev I. D., Nestoklon M. O., Singh A., Malko A., Goupalov S., Hollingsworth J. A., Htoon H. Intrinsic Exciton Photophysics of PbS Quantum Dots Revealed by Low-Temperature Single Nanocrystal Spectroscopy // Nano Letters. 2019. Vol. 19. No. 12. pp. 8519-8525.
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TY - JOUR
DO - 10.1021/acs.nanolett.9b02937
UR - https://doi.org/10.1021/acs.nanolett.9b02937
TI - Intrinsic Exciton Photophysics of PbS Quantum Dots Revealed by Low-Temperature Single Nanocrystal Spectroscopy
T2 - Nano Letters
AU - Krishnamurthy, Sachidananda
AU - Hu, Zhongjian
AU - Nestoklon, M. O.
AU - Singh, Ajay
AU - Malko, A.
AU - Goupalov, Serguei
AU - Hollingsworth, Jennifer A.
AU - Htoon, Han
AU - Kim, Younghee
AU - Avdeev, I. D.
PY - 2019
DA - 2019/11/12 00:00:00
PB - American Chemical Society (ACS)
SP - 8519-8525
IS - 12
VL - 19
SN - 1530-6984
SN - 1530-6992
ER -
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@article{2019_Hu,
author = {Sachidananda Krishnamurthy and Zhongjian Hu and M. O. Nestoklon and Ajay Singh and A. Malko and Serguei Goupalov and Jennifer A. Hollingsworth and Han Htoon and Younghee Kim and I. D. Avdeev},
title = {Intrinsic Exciton Photophysics of PbS Quantum Dots Revealed by Low-Temperature Single Nanocrystal Spectroscopy},
journal = {Nano Letters},
year = {2019},
volume = {19},
publisher = {American Chemical Society (ACS)},
month = {nov},
url = {https://doi.org/10.1021/acs.nanolett.9b02937},
number = {12},
pages = {8519--8525},
doi = {10.1021/acs.nanolett.9b02937}
}
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Hu, Zhongjian, et al. “Intrinsic Exciton Photophysics of PbS Quantum Dots Revealed by Low-Temperature Single Nanocrystal Spectroscopy.” Nano Letters, vol. 19, no. 12, Nov. 2019, pp. 8519-8525. https://doi.org/10.1021/acs.nanolett.9b02937.