Spectroscopic properties of Ce3Â +/Tb3Â + co-doped high silica scintillating glass

Ce3 +/Tb3 + co-doped high silica scintillating glasses were prepared by sintering porous glasses in CO reducing atmosphere. The uniformly distributed nanopores in the prepared glass are quite suitable for absorbing Tb3 + and Ce3 + ions due to large specific surface. The main mechanism of absorbing of Tb3 + and Ce3 + in high silica glass was hydrogen bonds. The calculated doping concentration of Ce3 + in the glass is agreed with measured densities, excitation spectrum as well as emission spectrum at room temperature. The emission spectrum proves that the intensity of Tb3 + could be enhanced by Ce3 +, and specially the intensity of highest peaks at 543 nm have been increased to 10 times stronger than those without Ce3 +. Moreover, with the Ce3 + concentration increased to 0.2 mol/L, the luminescence intensity increased to a maximum and then decreased due to the concentration quenching of Ce3 +. The process of energy transfer between Ce3 + and Tb3 + and the concentration quenching were analyzed thoroughly in high silica glass.