Exciton formation and decay dynamics in electroluminescent polymers observed by subpicosecond stimulated emission
- 1 April 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 49 (14), 9419-9422
- https://doi.org/10.1103/physrevb.49.9419
Abstract
We observe stimulated exciton emission and Raman gain in stretch oriented poly(paraphenylenevinylene) (PPV) films with 200 fs resolution. The 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.Keywords
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