Abstract
We report on the Franck-Condon analysis of temperature dependence emission spectra (140– 340K) of spin-casted poly(9.9-dioctylfluorenyl-2.7-diyl)(PF8) thin films. The photoluminescence spectra were analyzed considering the contribution of two species: isolates and aggregates. Results obtained from photoluminescence excitation and confocal spectroscopy measurements corroborate the hypothesis of two emitting species. FT-IR and Raman spectroscopy were used to obtain the effective electron-vibrational modes for the isolate (700cm−1) and aggregate (1250cm−1 and 1400cm−1) species, providing values to be used in the Franck-Condon analysis. From the half maximum Gaussian bandwidth (Δε), we calculated an activation energy of approximately 250meV for the inter-chain interaction (aggregates species), which were associated with the onset of movement on the polymer׳s side chain (β-relaxation).
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