Abstract
We have studied the emission spectra of spin-coated films of a novel soluble substituted quinque-thiophene under nanoseconds pulsed excitation. The photoluminescence spectra show a clear line narrowing, ascribed to amplified spontaneous emission assisted by waveguiding inside the film slab, for excitation energy fluence above $0.8\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}2}$. We employed our oligothiophene as active medium for a fully organic distributed feedback (DFB) resonator on a flexible transparent substrate of poly(dimethylsiloxane) (PDMS). The DFB has been fabricated by replica molding from a master grating realized by electron-beam lithography, and subsequent spin coating of the active material on the patterned side of PDMS. It shows a clear DFB emission at about $603\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ of linewidth $0.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.
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