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Dynamics and Coherent Control of Exciton-Exciton Annihilation in Aqueous J-Aggregate

Ma, Fei LU (2018) In The Journal of Physical Chemistry Part B 122(47). p.10746-10753
Abstract

In aqueous solution of 1,1'-diethyl-2,2'-carbocyanine J-aggregate, the exciton self-trapped (EST) state is usually expected to be negligible. However, in this work, by measuring transient absorption spectroscopy under a variety of excitation fluences, the EST state was found to be formed via coherent exciton-exciton annihilation (EEA), when the excitation fluence was high enough. With the existence of a shoulder-stimulated emission band at 615 nm and a broad EST state absorption band at long wavelength, diffusion-limited and coherent EEAs can be distinguished. Adaptive coherent control was employed to check if EEA dynamics can be influenced by a shaped excitation pulse. We found that both the diffusion-limited and coherent EEAs can be... (More)

In aqueous solution of 1,1'-diethyl-2,2'-carbocyanine J-aggregate, the exciton self-trapped (EST) state is usually expected to be negligible. However, in this work, by measuring transient absorption spectroscopy under a variety of excitation fluences, the EST state was found to be formed via coherent exciton-exciton annihilation (EEA), when the excitation fluence was high enough. With the existence of a shoulder-stimulated emission band at 615 nm and a broad EST state absorption band at long wavelength, diffusion-limited and coherent EEAs can be distinguished. Adaptive coherent control was employed to check if EEA dynamics can be influenced by a shaped excitation pulse. We found that both the diffusion-limited and coherent EEAs can be suppressed. Ground-state vibronic coupling and non-Condon-type exciton-phonon coupling were discussed to explain the observations.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
122
issue
47
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85057571449
  • pmid:30395710
ISSN
1520-5207
DOI
10.1021/acs.jpcb.8b09891
language
English
LU publication?
yes
id
bda64d03-1d15-4c71-bc8d-a880a4d4b328
date added to LUP
2018-12-10 14:23:06
date last changed
2021-09-29 03:48:43
@article{bda64d03-1d15-4c71-bc8d-a880a4d4b328,
  abstract     = {<p>In aqueous solution of 1,1'-diethyl-2,2'-carbocyanine J-aggregate, the exciton self-trapped (EST) state is usually expected to be negligible. However, in this work, by measuring transient absorption spectroscopy under a variety of excitation fluences, the EST state was found to be formed via coherent exciton-exciton annihilation (EEA), when the excitation fluence was high enough. With the existence of a shoulder-stimulated emission band at 615 nm and a broad EST state absorption band at long wavelength, diffusion-limited and coherent EEAs can be distinguished. Adaptive coherent control was employed to check if EEA dynamics can be influenced by a shaped excitation pulse. We found that both the diffusion-limited and coherent EEAs can be suppressed. Ground-state vibronic coupling and non-Condon-type exciton-phonon coupling were discussed to explain the observations.</p>},
  author       = {Ma, Fei},
  issn         = {1520-5207},
  language     = {eng},
  number       = {47},
  pages        = {10746--10753},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Dynamics and Coherent Control of Exciton-Exciton Annihilation in Aqueous J-Aggregate},
  url          = {http://dx.doi.org/10.1021/acs.jpcb.8b09891},
  doi          = {10.1021/acs.jpcb.8b09891},
  volume       = {122},
  year         = {2018},
}