Probing phase relaxation by measuring fluorescence interference:: polarization beating and electron-phonon coupling in conjugated polymers

被引:11
作者
Milota, F
Sperling, J
Tortschanoff, A
Szöcs, V
Kuna, L
Kauffmann, HF
机构
[1] Univ Vienna, Inst Chem Phys, A-1090 Vienna, Austria
[2] Comenius Univ, Inst Chem, SK-84215 Bratislava, Slovakia
关键词
conjugated polymers; time-resolved fluorescence spectroscopy;
D O I
10.1016/j.jlumin.2004.01.044
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report on the measurement of coherent optical-excitation transients in the low-energy states of the strongly disordered multi-chromophore poly(para-phenylene-vinylene) at low phonon temperatures. Interferometric femtosecond (fs) excitation/probing measurements, employing freely propagating 70 fs pulses have been used to generate spatially overlapping electronic and nuclear wavepackets. High-resolution detection in combination with the unique spectral features of the sample was used to project-out two vibronic fluorescence transitions with discrete arrival states alpha and beta. By monitoring the correlations of the alpha- and beta-photons on the detector, the coherent superposition can be probed as a typical polarization beating. The recorded fluorescence interferograms show strong damping on a timescale of 200 fs. The relaxation of the coherent signal is indicative of, mostly, homogeneous site-dephasing and hence, gives rise to the observation of the structural relaxation of the initial Franck-Condon excitation, i.e. the formation of the dressed state. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:205 / 209
页数:5
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