[en] The contribution of new materials involving composites has reached the most varied fields of science, both from the scientific and technological point of view. This is due to man's needs in many applications. Thus, this work shows the preparation of composites in a film shape, containing chromium oxide on substrates of Polyvinylidene Fluoride (PVDF). The chromium oxide (Cr₂O₃) was selected due to its important optical properties, and the PVDF was chosen because it is a low cost polymer and it is easy to prepare in the film form. The method used to obtain the samples was the so called 'casting' one. In order to analyze the incorporation of chromium oxide (Cr₂O₃) in PVDF film, the following characterization techniques were carried out: the crystal structure of the films was checked by X-ray diffraction, mass changes and decomposition by thermogravimetry, and electronic excited state by luminescence spectroscopy. (author)