Concentration dependence of luminescence of Tb³⁺-doped silicate glasses

A series of concentration-varied Tb3+-doped silicate glasses were synthesized by the melt-quenching process. Photoluminescence and radioluminescence of Tb3+-doped silicate glasses were studied under UV and X-ray excitation, respectively. The similar concentration dependence of Tb3+ luminescence on its dopant concentration was obtained under both UV and X-ray excitation. That is, the blue emission (5D3→7FJ) dominates in the case of low concentration Tb3+-doped silicate glass, while the green one (5D4→7FJ) dominates in high concentration doping. The dependence of the intensity on Tb3+-dopant concentration indicates that the quenching of the 5D3 stat