A hindered phenol type radical scavenger (Irganox 1010®) was used to improve
the resistance to photo-oxidation in PPV-type polymers. The degradation was
performed under blue light (460 nm), and the effect of the added compound
was investigated following the intensity variation of absorbance and
photoluminescence spectra. The results showed that the addition of the
compound brought about a significant enhancement in photodegration
resistance without interfering in the electronic properties of the polymers.
These results suggest that the free radical scavenger attenuates the
decrease of the polymer conjugation length induced by the radiation. FTIR
measurements confirm this evidence.