EXCITONS IN POLY(PARA-PHENYLENEVINYLENE)

Citation
M. Chandross et al., EXCITONS IN POLY(PARA-PHENYLENEVINYLENE), Physical review. B, Condensed matter, 50(19), 1994, pp. 14702-14705
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
50
Issue
19
Year of publication
1994
Pages
14702 - 14705
Database
ISI
SICI code
0163-1829(1994)50:19<14702:EIP>2.0.ZU;2-F
Abstract
We show that one-electron band theory fails to describe optical absorp tion in PPV and the absorption spectrum can be described only within a Coulomb-correlated model. The lowest optical state is an exciton, who se binding energy is estimated theoretically to be 0.90+/-0.15 eV. Mea surements of the photoconductivity quantum efficiency in poly[2-methox y,5-(2'-ethyl-hexyloxy)-1,4 phenylenevinylene] reveal a binding energy in good agreement with the theoretical value.