Abstract
Ultrafast optical response in polydiacetylenes and polythiophense was investigated by femtosecond time-resolved absorption spectroscopy. Several nonlinear optical processes, i.e. hole burning, Raman gain, and induced-frequency shift, were observed and the third-order nonlinear susceptibilities were determined. The ultrafast relaxation dynamics following after the photoexcitation was investigated and the formation and relaxation of self-trapped exciton was observed. A model of the relaxation processes of excitons in conjugated polymers is proposed. The short life of STE and difference between fluorescent and nonfluorescent polymers are explained.
| Original language | English |
|---|---|
| Pages (from-to) | 83-88 |
| Number of pages | 6 |
| Journal | Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals |
| Volume | 217 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1992 Jun 1 |
| Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics