Excitons in quasi-one-dimensional organic crystals

被引:51
|
作者
Knupfer, M [1 ]
Schwieger, T
Fink, J
Leo, K
Hoffmann, M
机构
[1] Inst Festkorper & Werkstofforsch Dresden, D-01171 Dresden, Germany
[2] Tech Univ Dresden, Inst Angew Photophys, D-01062 Dresden, Germany
[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
来源
PHYSICAL REVIEW B | 2002年 / 66卷 / 03期
关键词
D O I
10.1103/PhysRevB.66.035208
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present an electron energy-loss study of the nature and dispersion of excitons in quasi-one-dimensional 3,4:9,10-perylenetetracarboxylic dianhydride molecular crystals. The observed anisotropy of the excitation energies, the spectral shape and the dispersion indicates the presence of two types of excitons near the excitation onset. These are associated with mixed intramolecular Frenkel and intermolecular charge-transfer excitons. In particular, the excitons exhibit a negative dispersion along the molecular stacks which has important consequences for their recombination.
引用
收藏
页码:352081 / 352085
页数:5
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