High-resolution luminescence of epitaxial organic films: Quaterthiophene on Ag(111)

被引：14

作者：

Gebauer, W

Babler, M

Soukopp, A

Vaterlein, C

Fink, R

Sokolowski, M

Umbach, E

机构：

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

来源：

SYNTHETIC METALS | 1996年 / 83卷 / 03期

关键词：

luminescence; films; quaterthiophene;

D O I：

10.1016/S0379-6779(96)04478-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thin films (less than 40 Angstrom) of quaterthiophene (4T) were vapour deposited onto a Ag(111) surface under ultrahigh vacuum (UHV) and were investigated concerning their geometrical structure and photoluminescence (PL) properties by low-energy electron diffraction (LEED) and optical spectroscopy, respectively. Two different structural phases (alpha and beta) were observed, which exhibit high structural order, with crystalline domains that are oriented with respect to the Ag(111) surface. Phase alpha is formed if 4T is deposited onto a 200 K cold Ag surface; phase beta forms after an additional annealing step at 300 K. Due to the high order, the PL spectra of both phases show very narrow lines (phase beta: FWHM(0-0)less than or equal to 40 cm(-1)) and highly resolved fine structures, which are discussed in detail. In comparison with 4T films on glass, PL efficiency of phase beta is larger by a factor of at least five.

引用

页码：227 / 230

页数：4

共 13 条

[1]

ADACHI C, 1988, JPN J APPL PHYS, V27, pL629

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