PICOSECOND PHOTOPHYSICS OF LUMINESCENT CONDUCTING POLYMERS - FROM EXCITONS TO POLARON PAIRS

Authors
FROLOV SV GELLERMANN W VARDENY ZV OZAKI M YOSHINO K
Citation
Sv. Frolov et al., PICOSECOND PHOTOPHYSICS OF LUMINESCENT CONDUCTING POLYMERS - FROM EXCITONS TO POLARON PAIRS, Synthetic metals, 84(1-3), 1997, pp. 493-496
Citations number
13
Categorie Soggetti
Physics, Condensed Matter","Material Science","Polymer Sciences
Journal title
Synthetic metals → ACNP
ISSN journal
03796779
Volume
84
Issue
1-3
Year of publication
1997
Pages
493 - 496
Database
ISI
SICI code
0379-6779(1997)84:1-3<493:PPOLCP>2.0.ZU;2-G
Abstract
We present a study of picosecond(ps) time-resolved photo-modulation(PM ) spectroscopy of DOOPPV in solution, pristine, photooxidized and C-60 -doped DOOPPV films, and thin films of P3BT. We find that the photophy sics of pristine luminescent polymers is determined by excitons, which in the singlet manifold are characterized by a PM spectrum consisting of two photoinduced absorption(PA) bands and a stimulated emission ba nd. Excitons in the triplet manifold, on the contrary can be identifie d by a PM spectrum consisting of a single PA band. After photo-oxidati on or doping, a new type of photo-excitations is produced-intrachain p olaron pairs, characterized by a broad PA band and much slower recombi nation dynamics compared to that of sin let excitons.