Factors Influencing Stimulated Emission from Poly({ital p}-phenylenevinylene)

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.733· OSTI ID:439112

Denton, G; Tessler, N; Harrison, N; Friend, R ^[1]

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1. Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE (United Kingdom)

We report measurements of stimulated emission (SE) in films of poly({bold {ital p}}-phenylenevinylene) (PPV). SE is observed in the region of the cw photoluminescence, using 3.8eV 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 (3{times}10{sup 19}cm{sup -3}) the fast decay of the SE is largely due to exciton-exciton annihilation. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 439112
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXCITONS
FILMS
LASER CAVITIES
OPTICAL PUMPING
PHOTOLUMINESCENCE
POLARONS
POLYMERS
STIMULATED EMISSION