DIRECT OBSERVATION OF ULTRAFAST FIELD-INDUCED CHARGE GENERATION IN LADDER-TYPE POLY(PARA-PHENYLENE)

Authors
GRAUPNER W CERULLO G LANZANI G NISOLI M LIST EJW LEISING G DESILVESTRI S
Citation
W. Graupner et al., DIRECT OBSERVATION OF ULTRAFAST FIELD-INDUCED CHARGE GENERATION IN LADDER-TYPE POLY(PARA-PHENYLENE), Physical review letters, 81(15), 1998, pp. 3259-3262
Citations number
21
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
81
Issue
15
Year of publication
1998
Pages
3259 - 3262
Database
ISI
SICI code
0031-9007(1998)81:15<3259:DOOUFC>2.0.ZU;2-6
Abstract
Electric field-induced charge photogeneration in ladder-type poly(para -phenylene) is investigated by field-assisted femtosecond pump-probe e xperiments carried out on light emitting diodes. The characteristic ph otoinduced absorption band at 1.9 eV allows one to directly monitor th e polaron population. We find that polarons are formed by exciton fiss ion without intermediate states on a time scale of 10 ps. The buildup kinetics of the polaron population suggests a dissociation driven by e xciton diffusion during interchain thermalization. [S0031-9001(98)0736 5-7].