Propriedades fotocromáticas dos vidros fosfatos PWSA e PZABP

Abstract

The phosphate matrices NaPO3·WO3·Sb2O3·AgNO3 (PWSA) e P2O5·ZnO·Al2O3·BaO·PbO (PZABP) were studied and compared for their photosensitive characteristics. The analyzes involved the absorption and temporal photoluminescence having the recombination centers responsible for the photosensitivity mainly for the transition metals. It is believed that changes in the recombination centers responsible for photosensitivity are mainly caused by the transition metals WO3 and ZnO. The excitation sources used were a xenon lamp at 377 nm and cw UV laser operating at 355 nm. The variation of the components of the PWSA matrix played an important role in the visualization and understanding of the photosensitive effect by the formation of defect centers (WO2-4). In the PZABP glass, photodarkening was observed when the concentrations of ytterbium were varied in the samples. Both the PWSA and PZABP matrix showed photosensitive effects when analyzed using spectroscopic techniques. The first performed reversibility and reproducibility characteristics for this purpose, while the second did not present such particularities. Matrices doped with Er3+, Tm3+ and Yb3+ ions had no measurable changes in their spectroscopic properties.This work can be useful in the development of devices in the field of photonics such as laser application and three-dimensional data storage.