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We report measurements of stimulated emission (SE) in films of poly (p-phenylenevinylene) (PPV). SE is observed in the region of the cw photoluminescence, using 3. 8 eV excitation, and 25% gain was obtained when a PPV film was incorporated into a microcavity structure. We show that photo-oxidation greatly reduces the SE. We demonstrate that singlet polaron excitons form a high proportion of the initially photoexcited states in pristine PPV, and consider that at the excitation density used here (310^19cm^-3) the fast decay of the SE is largely due to exciton-exciton annihilation.
Denton et al. (1997) studied this question.