Energy gaps, refractive index and photon emission from point defects in copper-doped Gd2O3 nanocrystalline films

•Reactive anodic evaporation method provides the synthesis of single-phase Gd2O3 films.•The embedding of Cu leads to a decrease in the transparency gap of Gd2O3 film.•Copper doping results to a decrease in refractive index and to an increase in its dispersion for Gd2O3 film.•The embedding of Cu into...

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