Oxide phosphorescent glass capable of exhibiting a long lasting afterglow and photostimulated luminescence

Abstract

The present invention provides an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, can be used not only as a material for confirming an infrared laser or controlling an optical axis, but also as a material for recording or reproducing of γ-rays, X-rays or UV-rays images and further can be used as an optical recording material of such a type that can be read. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %): GeO2 21 to 80% ZnO 0 to 50% Ga2O2 0 to 55% (ZnO + Ga2O3 = 3 to 55%) Tb2O3 0 to 10% MnO 0 to 2% (Tb2O3 + MnO = 0.01 to 10%) R2O 0 to 45% (R: at least one atom selected from Li, Na, K and Cs) R′O 0 to 40% (R′: at least one atom selected from Mg, Ca, Sr and Ba) R2O + R′O 0.5 to 45% SiO2 0 to 50% B2O3 0 to 20% Al2O3 0 to 20% Yb2O3 0 to 7% and Ln2O3 0 to 5% (Ln: at least one atom selected from Sm, Dy, Tm, Pr, Y, La, Gd, Lu and Nd).

Dependencies are inferred from the claim text.