Theoretical analysis of the relaxation dynamics in perylene bisimide dimers excited by femtosecond laser pulses.

Theoretical analysis of the relaxation dynamics in perylene bisimide dimers excited by femtosecond laser pulses.
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飞秒激光脉冲激发苝双酰亚胺二聚体弛豫动力学的理论分析

DOI:
10.1021/jp412166a
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发表时间:
2014
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
V. Engel
V. Engel
中科院分区:
--
文献类型:
--
作者:
A. Schubert;M. Falge;M. Kess;V. Settels;S. Lochbrunner;W. T. Strunz;F. Würthner;B. Engels;V. Engel

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我们提出了一个模型的弛豫动力学在?酰亚胺二聚体,这是基于从头计算的电子结构和量子动力学计算,包括耗散的影响。激发态动力学的收益通过混合的电子状态的本地弗伦克尔和电荷转移字符,这成为有效的二聚体几何形状的小失真。通过这种方式,可以解释光激发态的快速减少,我们通过飞秒瞬态吸收测量表征。理论和实验相结合的分析暗示了一种捕获机制,该机制涉及激发态振动流形中的非绝热和耗散动力学,并提供了一种原子图像,可能对未来的光伏材料设计有价值。
We present a model for the relaxation dynamics in perylene bisimide dimers, which is based on ab initio electronic structure and quantum dynamics calculations including effects of dissipation. The excited-state dynamics proceeds via a mixing of electronic states of local Frenkel and charge-transfer characters, which becomes effective upon a small distortion of the dimer geometry. In this way, it is possible to explain the fast depopulation of the photoexcited state, which we characterize by femtosecond transient absorption measurements. The combined theoretical and experimental analysis hints at a trapping mechanism, which involves nonadiabatic and dissipative dynamics in an excited-state vibronic manifold and provides an atomistic picture that might prove valuable for future design of photovoltaic materials.
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影响因子: --
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