Nano Letters, volume 15, issue 6, pages 4045-4051
Photoluminescence Blinking and Reversible Electron Trapping in Copper-Doped CdSe Nanocrystals.
Publication type: Journal Article
Publication date: 2015-05-29
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
Single-particle photoluminescence blinking is observed in the copper-centered deep-trap luminescence of copper-doped CdSe (Cu(+):CdSe) nanocrystals. Blinking dynamics for Cu(+):CdSe and undoped CdSe nanocrystals are analyzed to identify the effect of Cu(+), which selectively traps photogenerated holes. Analysis of the blinking data reveals that the Cu(+):CdSe and CdSe nanocrystal "off"-state dynamics are statistically identical, but the Cu(+):CdSe nanocrystal "on" state is shorter lived. Additionally, a new and pronounced temperature-dependent delayed luminescence is observed in the Cu(+):CdSe nanocrystals that persists long beyond the radiative lifetime of the luminescent excited state. This delayed luminescence is analogous to the well-known donor-acceptor pair luminescence of bulk copper-doped phosphors and is interpreted as revealing metastable charge-separated excited states formed by reversible electron trapping at the nanocrystal surfaces. A mechanistic link between this delayed luminescence and the luminescence blinking is proposed. Collectively, these data suggest that electron (rather than hole) trapping/detrapping is responsible for photoluminescence intermittency in these nanocrystals.
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Whitham P. J. et al. Photoluminescence Blinking and Reversible Electron Trapping in Copper-Doped CdSe Nanocrystals. // Nano Letters. 2015. Vol. 15. No. 6. pp. 4045-4051.
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Whitham P. J., Knowles K. E., Reid P. J., Gamelin D. R. Photoluminescence Blinking and Reversible Electron Trapping in Copper-Doped CdSe Nanocrystals. // Nano Letters. 2015. Vol. 15. No. 6. pp. 4045-4051.
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TY - JOUR
DO - 10.1021/acs.nanolett.5b01046
UR - https://doi.org/10.1021/acs.nanolett.5b01046
TI - Photoluminescence Blinking and Reversible Electron Trapping in Copper-Doped CdSe Nanocrystals.
T2 - Nano Letters
AU - Whitham, Patrick J
AU - Reid, Philip J.
AU - Knowles, Kathryn E
AU - Gamelin, D. R.
PY - 2015
DA - 2015/05/29 00:00:00
PB - American Chemical Society (ACS)
SP - 4045-4051
IS - 6
VL - 15
SN - 1530-6984
SN - 1530-6992
ER -
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@article{2015_Whitham,
author = {Patrick J Whitham and Philip J. Reid and Kathryn E Knowles and D. R. Gamelin},
title = {Photoluminescence Blinking and Reversible Electron Trapping in Copper-Doped CdSe Nanocrystals.},
journal = {Nano Letters},
year = {2015},
volume = {15},
publisher = {American Chemical Society (ACS)},
month = {may},
url = {https://doi.org/10.1021/acs.nanolett.5b01046},
number = {6},
pages = {4045--4051},
doi = {10.1021/acs.nanolett.5b01046}
}
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MLA
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Whitham, Patrick J., et al. “Photoluminescence Blinking and Reversible Electron Trapping in Copper-Doped CdSe Nanocrystals..” Nano Letters, vol. 15, no. 6, May. 2015, pp. 4045-4051. https://doi.org/10.1021/acs.nanolett.5b01046.