Ultrafast intrachain exciton dynamics in π-conjugated polymers
Z.V. Vardeny, University of Utah, USA
C.-X. Sheng, Nanjing University of Science and Technology, China
Abstract:
We have used the femtosecond transient photomodulation spectroscopy in a broad spectral range for studying the ultrafast dynamics of the primary photoexcitations in various polymers. An emerging universal picture is presented based on the C2h point group symmetry of the polymer chain, where the electron-electron interaction is dominant. In this picture the 1Bu exciton is the primary photoexcitation. However, the 1Bu exciton may decay within a few hundreds fs to the more stable 'dark' exciton (2Ag) in 'dark' polymers where the photoluminescence (PL) efficiency ...
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