Photoluminescence spectroscopy can be used for the qualitative determination of transition metal ions (iron, chromium, copper, etc.) and rare earth ions in different kinds of materials. In the case of glass, ferric-iron produces an emission peak centred at about 910nm, which is partially absorbed by the ferrous-iron. Therefore, photoluminescence spectroscopy can be used as a complementary technique, coupled with the spectrophotometric method, for the determination of the redox state of glass. In this paper, this technique has been applied for the first time to glass samples with different thicknesses, in order to obtains he relationship between the photoluminescence peak intensity and the thickness of the glass. This relationship is required if one intends to use this method in the factory to check the glass manufacturing process.
