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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Fluorescence up-conversion study of excitation energy transport dynamics in oligothiophene-fullerene linked dyads
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Fluorescence up-conversion study of excitation energy transport dynamics in oligothiophene-fullerene linked dyads

机译：寡噻吩-富勒烯连接的二联体激发能输运动力学的荧光上转换研究

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摘要

Photoinduced excitation energy transport dynamics in oligothiophene-fulterene linked dyads, nT-C-60 (n = 4, 8, and 12), have been investigated by femtosecond fluorescence up-conversion. In 8T-C-60 and 12T-C-60, each time profile of the fluorescence due to the (1)nT* moiety consists of two components. The subpicosecond component and a few picosecond components were experimentally evaluated depending on the lengths of oligothiophenes (n =8 and 12) and on the analyzing wavelength of the fluorescence. However, the time trace of the fluorescence due to (1)4T*-C-60 decayed with a single short component in similar to 300 fs due to direct excited energy transfer (EET) from the (1)4T* moiety to the C-60 moiety. On the basis of the kinetic models considering the short and long locally pi-conjugative thiophene segments in ST-C-60 and 12T-C-60, the rate parameters of the elemental processes were evaluated. Sub-picosecond time constants of nT-C-60 were found to be EET from the thiophene segment vicinal to the C-60 moiety and intrachain energy transfer. Slower picosecond dynamics mainly corresponds to EET from the thiophene segments apart from the C-60 moiety.
机译：已通过飞秒荧光上转换研究了寡聚噻吩-富勒烯连接的二元体nT-C-60（n = 4、8和12）中的光诱导激发能传输动力学。在8T-C-60和12T-C-60中，由于（1）nT *部分导致的荧光的每个时间分布都由两个成分组成。根据寡噻吩的长度（n = 8和12）以及荧光的分析波长，对皮秒以下分量和几个皮秒分量进行了实验评估。然而，由于（1）4T * -C-60从（1）4T *部分到C的直接激发能量转移（EET），荧光的时间迹线以单个短分量衰减了约300 fs。 -60部分。基于考虑ST-C-60和12T-C-60中短而长的局部π共轭噻吩链段的动力学模型，评估了元素过程的速率参数。发现nT-C-60的亚皮秒时间常数是从噻吩片段附近到C-60部分以及链内能量转移的EET。较慢的皮秒动力学主要对应于除C-60部分以外的噻吩链段的EET。

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