Abstract
Transient excited-state absorption measurements in the spectral region spanning the infrared active vibrational active (IRAV) modes in prototypical luminescent polymers, poly(phenylene vinylene), PPV, and poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)], MEH-PPV, reveal charge carrier generation within 100 fs after photoexcitation. The photocarrier quantum efficiency in MEH-PPV is φo≈0.1 in zero applied electric field. There is no correlation between the temporal behavior of the photoinduced IRAV signals and the exciton lifetime. Thus, carriers are photoexcited directly and not generated via a secondary process from exciton annihilation. Our data indicate that the carrier recombination rate is sensitive to the strength of the inter-chain interaction.
Original language | English (US) |
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Pages (from-to) | 356-360 |
Number of pages | 5 |
Journal | Chemical Physics Letters |
Volume | 316 |
Issue number | 5-6 |
DOIs | |
State | Published - Jan 21 2000 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry