Journal of Physical Chemistry Letters, volume 8, issue 17, pages 3997-4003
Strong Dependence of Quantum-Dot Delayed Luminescence on Excitation Pulse Width
Publication type: Journal Article
Publication date: 2017-08-14
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 5.7
ISSN: 19487185, 19487185
Physical and Theoretical Chemistry
General Materials Science
Abstract
Delayed luminescence involving charge-carrier trapping and detrapping has recently been identified as a widespread and possibly universal phenomenon in colloidal quantum dots. Its near-power-law decay suggests a relationship with blinking. Here, using colloidal CuInS2 and CdSe quantum dots as model systems, we show that short (nanosecond) excitation pulses yield less delayed luminescence intensity and faster delayed luminescence decay than observed with long (millisecond) square-wave excitation pulses. Increasing the excitation power also affects the delayed luminescence intensity, but the delayed luminescence decay kinetics appear much less sensitive to excitation power than to excitation pulse width. An idealized four-state kinetic model reproduces the major experimental trends and highlights the very slow approach to steady state during photoexcitation, stemming from extremely slow detrapping of the metastable charge-separated state responsible for delayed luminescence. The impacts of these findings on proposed relationships between delayed luminescence and blinking are discussed.
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Citations by publishers
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American Chemical Society (ACS)
8 publications, 66.67%
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1 publication, 8.33%
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- We do not take into account publications without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Marchioro A. et al. Strong Dependence of Quantum-Dot Delayed Luminescence on Excitation Pulse Width // Journal of Physical Chemistry Letters. 2017. Vol. 8. No. 17. pp. 3997-4003.
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Marchioro A., Whitham P. J., Nelson A. D. L., De Siena M. C., Knowles K. E., Polinger V. Z., Reid P. J., Gamelin D. R. Strong Dependence of Quantum-Dot Delayed Luminescence on Excitation Pulse Width // Journal of Physical Chemistry Letters. 2017. Vol. 8. No. 17. pp. 3997-4003.
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TY - JOUR
DO - 10.1021/acs.jpclett.7b01426
UR - https://doi.org/10.1021/acs.jpclett.7b01426
TI - Strong Dependence of Quantum-Dot Delayed Luminescence on Excitation Pulse Width
T2 - Journal of Physical Chemistry Letters
AU - Whitham, Patrick J
AU - Polinger, Victor Z.
AU - Reid, Philip J.
AU - Gamelin, D. R.
AU - Marchioro, Arianna
AU - Nelson, Andrew D L
AU - De Siena, Michael C
AU - Knowles, Kathryn E
PY - 2017
DA - 2017/08/14 00:00:00
PB - American Chemical Society (ACS)
SP - 3997-4003
IS - 17
VL - 8
SN - 1948-7185
SN - 1948-7185
ER -
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@article{2017_Marchioro,
author = {Patrick J Whitham and Victor Z. Polinger and Philip J. Reid and D. R. Gamelin and Arianna Marchioro and Andrew D L Nelson and Michael C De Siena and Kathryn E Knowles},
title = {Strong Dependence of Quantum-Dot Delayed Luminescence on Excitation Pulse Width},
journal = {Journal of Physical Chemistry Letters},
year = {2017},
volume = {8},
publisher = {American Chemical Society (ACS)},
month = {aug},
url = {https://doi.org/10.1021/acs.jpclett.7b01426},
number = {17},
pages = {3997--4003},
doi = {10.1021/acs.jpclett.7b01426}
}
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Marchioro, Arianna, et al. “Strong Dependence of Quantum-Dot Delayed Luminescence on Excitation Pulse Width.” Journal of Physical Chemistry Letters, vol. 8, no. 17, Aug. 2017, pp. 3997-4003. https://doi.org/10.1021/acs.jpclett.7b01426.