Para-hexaphenylene (p-6P) organic nanofibers emit polarized, blue light upon UV excitation with a peak wavelength of the emitted light of 425 nm  and a spatially anisotropic distribution of the emitted light . These features could enable future (opto-)electronic applications , since, for example, these molecules in the form of a thin film can function as an OLED . However, the nanofibers exhibit a characteristic photoinduced reaction during illumination with UV light that causes a decrease in luminescence intensity (bleaching) and that is partly attributed to photooxidation . Here, we present results of systematic bleaching experiments, in which we have investigated diverse mono- and multilayer coating materials. It is found that the most promising combination results in a significant reduction of bleaching without affecting significantly the emission spectrum.
Organic nanofibers; Bleaching; Coating; p6P
Main Research Area:
Chemistry and Physics of Materials for Energetics. A European School in Materials Science. Physics and Chemistry of Advanced Materials (PCAM), 2009