Femtosecond Time-Resolved Spectroscopic Studies on Thiophene Oligomers
Femtosecond Time-Resolved Spectroscopic Studies on Thiophene Oligomers
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DOI：
10.1021/jp961670n
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发表时间：
1997-01
影响因子：
2.9
通讯作者：
D. Lap;D. Grebner;S. Rentsch
中科院分区：
文献类型：
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作者：
D. Lap;D. Grebner;S. Rentsch
在430−830 nm的脉冲激发下，研究了溶液中含2~6个基团的噻吩齐聚物(NT)。在1−~2ps内出现瞬时吸收和诱导荧光。一种“瞬时”吸收(A0)，它显示了一种大小相关的光谱结构，在最初的500fs内叠加了诱导的荧光。在第一皮秒内，不同NT的快速动力学过程非常相似。它们被解释为从每个齐聚物的最高可达电子能级开始向下到最低激发态S1的驰豫。
Thiophene oligomers (nT) with two to six units in solution are studied under pulse excitation (308 nm,350 fs) in the spectral range 430−830 nm. Transient absorption and induced fluorescence emerge within 1−2 ps. An “instant” absorption (A0), which shows a size dependent spectral structure superimposes the induced fluorescence during the first 500 fs. The fast kinetic processes of different nT are very similar during the first picosecond. They were interpreted as relaxation starting from the highest accessible electronic level down to the lowest excited-state S1 of each oligomer.