Journal of Chemical Physics, volume 146, issue 11, pages 114102

On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots

E N Bodunov 1
Yu.A. Antonov 1
A L Simões Gamboa 2
2
 
ITMO University 2 International Research and Education Centre for Physics of Nanostructures, , 197101 St. Petersburg, Russia
Publication typeJournal Article
Publication date2017-03-16
Q1
Q1
SJR1.101
CiteScore7.4
Impact factor3.1
ISSN00219606, 10897690
Physical and Theoretical Chemistry
General Physics and Astronomy
Abstract

The non-exponential room temperature luminescence decay of colloidal quantum dots is often well described by a stretched exponential function. However, the physical meaning of the parameters of the function is not clear in the majority of cases reported in the literature. In this work, the room temperature stretched exponential luminescence decay of colloidal quantum dots is investigated theoretically in an attempt to identify the underlying physical mechanisms associated with the parameters of the function. Three classes of non-radiative transition processes between the excited and ground states of colloidal quantum dots are discussed: long-range resonance energy transfer, multiphonon relaxation, and contact quenching without diffusion. It is shown that multiphonon relaxation cannot explain a stretched exponential functional form of the luminescence decay while such dynamics of relaxation can be understood in terms of long-range resonance energy transfer to acceptors (molecules, quantum dots, or anharmonic molecular vibrations) in the environment of the quantum dots acting as energy-donors or by contact quenching by acceptors (surface traps or molecules) distributed statistically on the surface of the quantum dots. These non-radiative transition processes are assigned to different ranges of the stretching parameter β.

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Bodunov E. N., Antonov Y., Simões Gamboa A. L. On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots // Journal of Chemical Physics. 2017. Vol. 146. No. 11. p. 114102.
GOST all authors (up to 50) Copy
Bodunov E. N., Antonov Y., Simões Gamboa A. L. On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots // Journal of Chemical Physics. 2017. Vol. 146. No. 11. p. 114102.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1063/1.4978396
UR - https://doi.org/10.1063/1.4978396
TI - On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots
T2 - Journal of Chemical Physics
AU - Bodunov, E N
AU - Antonov, Yu.A.
AU - Simões Gamboa, A L
PY - 2017
DA - 2017/03/16
PB - AIP Publishing
SP - 114102
IS - 11
VL - 146
SN - 0021-9606
SN - 1089-7690
ER -
BibTex |
Cite this
BibTex (up to 50 authors) Copy
@article{2017_Bodunov,
author = {E N Bodunov and Yu.A. Antonov and A L Simões Gamboa},
title = {On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots},
journal = {Journal of Chemical Physics},
year = {2017},
volume = {146},
publisher = {AIP Publishing},
month = {mar},
url = {https://doi.org/10.1063/1.4978396},
number = {11},
pages = {114102},
doi = {10.1063/1.4978396}
}
MLA
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Bodunov, E. N., et al. “On the origin of stretched exponential (Kohlrausch) relaxation kinetics in the room temperature luminescence decay of colloidal quantum dots.” Journal of Chemical Physics, vol. 146, no. 11, Mar. 2017, p. 114102. https://doi.org/10.1063/1.4978396.
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