Scintillation properties of Dy-doped TeO₂–Al₂O₃–BaO glasses

抄録

We investigated photoluminescence (PL) and scintillation properties of Dy-doped tellurite glasses [80TeO₂–5Al₂O₃–(15 − x)BaO–xDy₂O₃ (x = 0.1–0.5)]. The Dy-doped tellurite glasses were prepared by the conventional melt-quenching method. In PL, all the Dy-doped tellurite glasses showed sharp emission peaks at approximately 575, 660 and 755 nm originated from the 4f–4f transition of Dy³⁺. The 0.5 and 1.0 % Dy-doped tellurite glasses exhibited high PL intensities under 450 nm excitation light. In scintillation, the Dy-doped tellurite glasses showed emissions peaking at approximately 485, 585 and 665 nm due to the 4f–4f transitions of Dy³⁺, and the 1.0 % Dy-doped tellurite glass exhibited the highest scintillation intensity. Furthermore, the PL and scintillation decay time constants of the Dy-doped tellurite glasses were about 12.6–367 and 30.2–248 µs, respectively. Theses decay time constants were typical values for the 4f–4f transition of Dy³⁺. In addition, the Dy-doped tellurite glasses showed moderate afterglow levels of about 289–751 ppm, and the afterglow level of the 1.0 % Dy-doped tellurite glass (289 ppm) was almost comparable to that of a commonly used inorganic scintillator Tl-doped CsI.