Blue-emitting phosphate glasses synthesized via reduction of tin(IV) by silicon
The Si-reductant route to produce blue-emitting tin-doped phosphate glasses is proposed. SnO2/Si co-doped glasses were prepared in a P2O5:BaO matrix by a simple melt-quench method in ambient atmosphere. This lead to the silicon-driven reduction of tin(IV) to tin(II) resulting in the production of the luminescent glasses. While the as-prepared SnO2-doped glass appeared non-luminescent, the addition of increasing amounts of silicon powder up to 6 mol% to batch materials facilitated developing the blue-emitting character of the glasses under excitation in the ultraviolet (UV). Reductant-induced luminescent defects became readily noticeable upon addition of the highest amount of silicon. Time-resolved UV-excited emission spectra appeared consistent with the different contributors to the exhibited luminescence being the twofold-coordinated tin centers alongside silicon-related defects. Emission from the latter appeared to be analogous to that of carbon-related defects recently reported, thus supporting that the corresponding luminescence results from the presence of oxygen radicals created by the highly reductive environment irrespective of the element (C or Si).
Digital Object Identifier (DOI)
Jimenez. (2017). Blue-emitting phosphate glasses synthesized via reduction of tin(IV) by silicon. Optical Materials, 66, 179–184. https://doi.org/10.1016/j.optmat.2017.01.052