Ultrafast Electronic Energy Transfer Beyond the Weak Coupling Limit in a Proximal but Orthogonal Molecular Dyad.
Ultrafast Electronic Energy Transfer Beyond the Weak Coupling Limit in a Proximal but Orthogonal Molecular Dyad.
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在邻近但正交的分子二元组中超越弱耦合极限的超快电子能量传输。
DOI:
10.1021/acs.jpca.5b08640
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Hedley GJ
中科院分区:
文献类型:
--
作者:
Hedley GJ
Electronic energy transfer (EET) from a donor to an acceptor is an important mechanism that controls the light harvesting efficiency in a wide variety of systems, including artificial and natural photosynthesis and contemporary photovoltaic technologies. The detailed mechanism of EET at short distances or large angles between the donor and acceptor is poorly understood. Here the influence of the orientation between the donor and acceptor on EET is explored using a molecule with two nearly perpendicular chromophores. Very fast EET with a time constant of 120 fs is observed, which is at least 40 times faster than the time predicted by Coulombic coupling calculations. Depolarization of the emission signal indicates that the transition dipole rotates through ca. 64°, indicating the near orthogonal nature of the EET event. The rate of EET is found to be similar to structural relaxation rates in the photoexcited oligothiophene donor alone, which suggests that this initial relaxation brings the dyad to a conical intersection where the excitation jumps to the acceptor.
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DOI:
10.1021/jp7106507
发表时间:
2008
期刊:
The journal of physical chemistry. B
影响因子:
--
作者:
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通讯作者:
D. Beljonne
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DOI:
10.1021/jp9600773
发表时间:
1996
期刊:
The Journal of Physical Chemistry
影响因子:
--
作者:
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通讯作者:
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影响因子:
3.7
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