High-resolution optical spectra from ultrathin quaterthiophene films

被引：21

作者：

Gebauer, W

Vaterlein, C

Soukopp, A

Sokolowski, M

Umbach, E

机构：

[1] Experimentelle Physik II, Universtät Würzburg, D-97074 Würzburg, Am Hubland

来源：

THIN SOLID FILMS | 1996年 / 284卷

关键词：

oligothiophenes; photoluminescence; reflection spectroscopy; vapour deposition;

D O I：

10.1016/S0040-6090(95)08393-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The linear optical properties of quaterthiophene (4T) films of about 25 ti thickness were studied, The films were fabricated by vapour deposition of 4T on highly oriented pyrolytic graphite under high vacuum. In the photoluminescence and reflection spectra the vibronic lines are very sharp (FWHM (0-0) less than or equal to 50 cm(-1)) indicating a high degree of structural order in the films. This is supported by the absence of thermal quenching of the luminescence. Comparison with spectra of matrix-isolated 4T reveals very similar vibrational energies, indicating an undistorted structural conformation of 4T in the film, but some additional modes, probably ring deformation modes, are found. In the reflection spectra a splitting of 170 cm(-1) is observed for the first excited electronic level which is tentatively interpreted as Davydov splitting.

引用

页码：576 / 580

页数：5

共 16 条

[1] THE LOWEST ENERGY SINGLET-STATE OF TETRATHIOPHENE, AN OLIGOMER OF POLYTHIOPHENE [J].