Dynamics and Coherent Control of Exciton-Exciton Annihilation in Aqueous J-Aggregate
Research output: Contribution to journal › Article
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 suppressed. Ground-state vibronic coupling and non-Condon-type exciton-phonon coupling were discussed to explain the observations.
Details
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Organisations | |
Research areas and keywords | Subject classification (UKÄ) – MANDATORY
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Original language | English |
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Pages (from-to) | 10746-10753 |
Number of pages | 8 |
Journal | The Journal of Physical Chemistry Part B |
Volume | 122 |
Issue number | 47 |
Publication status | Published - 2018 |
Publication category | Research |
Peer-reviewed | Yes |