Growth and optical properties of $α$-sexithiopene doped para-sexiphenyl nanofibers

The deposition of highly crystalline self-assembled para-sexiphenyl (PSP) nanofibers doped with $α$-sexithiophene (6T) is reported. It is demonstrated that the morphology and orientation of the nanofibers are not altered by the presence of 6T, while the photoluminescence (PL) emission can be modified by the doping concentration, suggesting effective incorporation of the dopant into the nanofibers. Moreover, strong dependence of the PL intensity with the excitation polarization underlines the high molecular order within the crystalline matrix. Due to the expected dipole-dipole interaction provided by the highly ordered structures the observed results can be explained by a Förster energy transfer.