Abstract
Amorphous MoO 3 films were grown onto glass substrates by the thermal evaporation technique. Color centers in the films were generated by UV–VIS light irradiation (photochromism) in air at room temperature. As-grown films looked pale yellowish to naked eye and acquired a bluish tone after the coloration process. Refraction index and extinction coefficient were calculated on as-grown and colored samples by using macroscopic optical differential reflectance measurements fitted with the transfer matrix theoretical model. The coloration efficiency parameter and the refraction index values of MoO 3 films allowed us to calculate the oscillator strength ( f ) value equal to 0.22±0.02 by means of the optical absorption spectra. This value was obtained by fitting the experimental results to an optional expression of Smakula's formula, derived from a semi-classical theoretical model.
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