Doped-Dye Orientation Relative to Oriented Polyfluorene Host Film

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.

Ordered arrangement of F4TCNQ anions in three-dimensionally oriented P3HT thin films

“…Tanigaki et al succeeded in the post-doping of dye molecules in friction-transferred CP films by the vapor transportation method and emphasized that doped dye molecules were aligned with respect to the alignment of polymer backbones. Furthermore, they observed polarized white emission from a friction-transferred blue emissive polyfluorene film doped with orange emissive oligothiophene 45,46 .…”

White Polarized Electroluminescence Devices by Dye Deposition on Oriented Polyfluorene Films

“…We have been exploring these characteristics, in combination with appropriate doping techniques, for the purpose of changing the color of the device in a controlled manner to allow the production of devices that emit white light. 8,9) For doping, we have been applying the vapor transportation method, 9,10) which is especially suitable for oriented films because it allows doping after film production without the loss of molecular orientation. While we were able to apply this method for the whitening of -sexithiophene (6T)-doped oriented PFO films that emit polarized light, 9) intrinsically this process does not allow good control of the amount of dye doped into the matrix film.…”

Oriented Polyfluorene Films Dye-Doped for Whitening of Polarized Electroluminescent Devices

“…13) Here we report on the combination of vapor transportation and friction transfer methods, for doping linear fluorescent dyes into oriented polymer films. 14) The ultimate aim of this work is to produce white polarized EL devices by doping an orange dye into the blue emitting oriented PFO film in a way that the dye orientation is parallel to the orientation of the PFO film.…”