Abstract
Femtosecond spectroscopy studies of several thin conjugated polymer films and solutions were performed in order to examine the gain/loss in the excited state. The excited state shows bimolecular interaction at distances higher than 10 nm between excitations. The ultrafast dynamics are consistent with bimolecular dipole-dipole interaction, but a quantum delocalization of at least 5 nm has to be assumed. We show how the photoinduced absorption affects the emission of light in long as opposed to short (thin film) optical path configurations: the photoluminescence from thick sample spectrally overlaps the net gain (stimulated emission minus photoinduced absorption). The results show that the observed spectral narrowing occurs through amplified spontaneous emission.
Original language | English (US) |
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Pages (from-to) | 202-203 |
Number of pages | 2 |
Journal | Synthetic Metals |
Volume | 101 |
Issue number | 1 |
DOIs | |
State | Published - May 1999 |
Externally published | Yes |
Event | Proceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier Duration: Jul 12 1998 → Jul 18 1998 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry