Optical properties of thin films based on thermostable poly(oxadiazole-naphthylimide)s were investigated. The main absorption maxima of the films were centered at about 301–308 nm, their intensity and positions remaining almost unchanged up to 250 °C. The Kramers–Kronig analysis applied to the reflectance spectra yielded the extinction coefficient and refractive index values. The energy gaps obtained from the edge of the absorption coefficient, based on transmission and reflectivity measurements, were found in the range of 2.77–3.04 eV. In photoluminescence spectra, three maxima in the UV and blue spectral range were detected.
- Mariana-Dana Damaceanu
- Radu-Dan Rusu
- Bozena Jarzabek
