Ultrafast spectroscopy of even-parity states in π-conjugated polymers

被引:92
作者
Frolov, SV
Bao, Z
Wohlgenannt, M
Vardeny, ZV
机构
[1] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
[2] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA
关键词
D O I
10.1103/PhysRevLett.85.2196
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Relaxation dynamics of even parity (A,) states in poly(p-phenylene vinylene) derivatives are studied using a novel fsec transient spectroscopy, in which two different excitation pulses successively generate odd parity (1 B-1(u)) excitons at 2.2 eV and then reexcite them to higher A(g) states. For reexcitation energies h omega < 1.1 eV ultrafast internal conversion hack to 1(1)B(u) takes place in accordance with Vavilov-Kasha's rule. However, for h omega > 1.1 eV the decay occurs in a nonemissive state identified as a polaron pair, showing that the A, states above 3.3 eV mediate charge transfer.
引用
收藏
页码:2196 / 2199
页数:4
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