Abstract
Polyfluorene oriented films produced by a friction-transfer method show polarized blue-light emission. A subsequent doping of some types of fluorescent dyes into the oriented films using a vapor transportation method resulted in polarized emission from the oriented polymer and from the doped dye. Polarized photoluminescence spectra from the polyfluorene films doped with oligothiophenes, quaterthiophene, and sexithiophene showed that these materials exhibit marked dichroism caused by the alignment of the oligothiophene molecules parallel to the polymer chain. We succeeded in extending the wavelength range of the polarized emission by doping fluorescent dye into the films.
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