Femtosecond differential transmission spectroscopy of α-sexithienyl single crystals at low temperature

被引：3
作者：
Urbasch, G
Hopmeier, M
Giessen, H
Mahrt, RF
机构：
[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[2] Univ Marburg, Wissensch Zentrum Mat Wissensch, D-35032 Marburg, Germany
[3] Max Planck Inst Polymerforsch, D-55128 Mainz, Germany
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 51期
关键词：
D O I：
10.1021/jp002838e
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Spectral relaxation of photogenerated excitations and stimulated emission is investigated in an alpha -sexithienyl single crystal. We have performed femtosecond differential transmission spectroscopy, probing the spectral region from 1.85 to 2.6 eV, and time-resolved photoluminescence measurements at low temperature. Stimulated emission with amplification of the probe light which results in a positive differential transmission signal is observed at two spectral positions for polarization parallel to the molecular c-axis. The observed stimulated emission decays with a time constant of 85 ps. Different kinetics of the rise of the stimulated emission and the superimposed excited-state absorption has been observed for excitation with 3.1 eV. This difference vanishes for excitation with 2.3 eV. Stimulated emission proceeds also via trap luminescence.
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收藏
页码：12210 / 12214
页数：5
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