EXCITON FORMATION AND DECAY DYNAMICS IN ELECTROLUMINESCENT POLYMERS OBSERVED BY SUBPICOSECOND STIMULATED-EMISSION

Authors
YAN M ROTHBERG L HSIEH BR ALFANO RR
Citation
M. Yan et al., EXCITON FORMATION AND DECAY DYNAMICS IN ELECTROLUMINESCENT POLYMERS OBSERVED BY SUBPICOSECOND STIMULATED-EMISSION, Physical review. B, Condensed matter, 49(14), 1994, pp. 9419-9422
Citations number
23
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
49
Issue
14
Year of publication
1994
Pages
9419 - 9422
Database
ISI
SICI code
0163-1829(1994)49:14<9419:EFADDI>2.0.ZU;2-E
Abstract
We observe stimulated exciton emission and Raman gain in stretch orien ted poly(paraphenylenevinylene) (PPV) films with 200 fs resolution. Th e kinetics of stimulated emission of excitons show that excitons form and equilibrate within 200 fs after 500-nm photoexcitation with 100-fs laser pulses. Stimulated emission is not observed when higher energy photons are used to excite the polymer. The measured polarization and excitation wavelength dependence provide insight into the probability of exciton formation in PPV.