Femtosecond relaxation kinetics of fluorescent and nonfluorescent states in blue- and red-phase polydiacetylenes
Femtosecond relaxation kinetics of fluorescent and nonfluorescent states in blue- and red-phase polydiacetylenes
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蓝相和红相聚二乙炔中荧光和非荧光态的飞秒弛豫动力学
DOI：
10.1103/physrevb.60.15632
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发表时间：
1999
影响因子：
3.7
通讯作者：
吉澤 雅幸
中科院分区：
文献类型：
--
作者：
吉澤 雅幸
利用飞秒荧光光谱研究了聚二乙炔（PDA）光激发的弛豫动力学。红相PDA中荧光的瞬态响应具有160±40 fs、0.8±0.1 ps和6.7±0.4 ps的衰减时间常数。的衰减动力学是一致的飞秒光诱导吸收光谱观察到的瞬态吸光度变化。另一方面，蓝相PDA中的荧光消失得比瞬时吸光度变化快得多。在整个弛豫动力学过程中，红相PDA中的光激发是荧光态，而蓝相PDA中的光激发在170 fs内弛豫到非荧光态.
Relaxation kinetics of photoexcitations in polydiacetylenes (PDA’s) has been investigated using femtosecond fluorescence spectroscopy. Transient response of the fluorescence in red-phase PDA has decay time constants of 160±40 fs, 0.8±0.1 ps, and 6.7±0.4 ps. The decay kinetics is consistent with transient absorbance changes observed by femtosecond photoinduced absorption spectroscopy. On the other hand, the fluorescence in blue-phase PDA disappears much faster than the transient absorbance change. The photoexcitations in red-phase PDA are fluorescent during the whole relaxation kinetics, but the photoexcited exciton in blue-phase PDA relaxes to nonfluorescent state within 170 fs.