Study of [Thienylene-dialkoxy phenylene] Conjugated Materials

In this work we report on the electrochromic and optical studies of thin films of thienylene-dialkoxyphenylene. The films for the optical measurements were prepared by spin casting on glass and silicon substrates. Photoluminescence and absorption spectra were recorded in the temperature range from 300 K. The differences between the spectra of the polymer and the oligomer can be attributed to a higher mean conjugation length in the polymer than in the oligomer. We present also a first principles theoretical calculation which shows that the conjugated oligomer has an HOMO-LUMO energy around 2.0 eV, which is consistent with the experimental data.