Abstract
Femtosecond time-resolved absorption and picosecond luminescence spectroscopies was performed on polydiacetylenes (PDAs) and polythiophenes (PTs). Several nonlinear optical processes, i.e. hole burning, Raman gain, dynamic Stark shift, and resonant Kerr effect, were observed and the third-order susceptibilities were determined. The relaxation dynamics following after the photoexcitation of either free exciton (FE) or charge carriers in conjugated polymers was investigated. The formation and relaxation of self-trapped exciton (STE) was observed in both PDAs and PTs. A model of the relaxation processes of excitons in conjugated polymers is proposed. The model describes the potential curves of FE, STE, and the ground state in configuration space and can explain the short life of STE, difference between fluorescent and nonfluorescent polymers.
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