ELECTRONIC DEACTIVATION IN SINGLE CHAINS, NANO-AGGREGATES AND ULTRATHIN FILMS OF CONJUGATED OLIGOMERS

Authors
OELKRUG D EGELHAAF HJ GIERSCHNER J TOMPERT A
Citation
D. Oelkrug et al., ELECTRONIC DEACTIVATION IN SINGLE CHAINS, NANO-AGGREGATES AND ULTRATHIN FILMS OF CONJUGATED OLIGOMERS, Synthetic metals, 76(1-3), 1996, pp. 249-253
Citations number
21
Categorie Soggetti
Physics, Condensed Matter","Material Science","Polymer Sciences
Journal title
Synthetic metals → ACNP
ISSN journal
03796779
Volume
76
Issue
1-3
Year of publication
1996
Pages
249 - 253
Database
ISI
SICI code
0379-6779(1996)76:1-3<249:EDISCN>2.0.ZU;2-W
Abstract
Fluorescence spectra, quantum yields Phi(F), decay curves, and fluores cence anisotropies of oligothiophenes and oligophenylenevinylenes with varying chain lengths are determined in the dissolved state, in nano- aggregates acid in ultrathin films. Phi(F) decreases in the series mon omer > aggregate approximate to disordered film > oriented film by fou r powers of ten, whereas the average decay times remain unchanged. The orientational relaxation time is 35 ps in condensed oligothiophenes. The strong increase of Phi(F) with disorder is mainly attributed to th e increasing density of luminescence centers.