An oxide glass capable of exhibiting a long lasting afterglow and photostimulated luminescence

摘要

An oxide glass capable of exhibiting photostimulated luminescence by excitation by radiation, characterised in that it is capable of exhibiting a long lasting afterglow and has a constitutional composition comprising, at least, terbium oxide (Tb 2 O 3 ) or manganese oxide (MnO), gallium oxide (Ga 2 O 3 ) or aluminium oxide (Al 2 O 3 ), alkali metal oxide or alkaline earth metal oxide and boron oxide (B 2 O 3 ) or silicon oxide (SiO 2 ) and which is represented, in terms of atoms making up the glass, by the following chemical composition (mol%): SiO 2 0 to 70% B 2 O 3 0 to 80% (SiO 2 + B 2 O 3 = 10 to 80%) Tb 2 O 3 0 to 10% MnO 0 to 2% (Tb 2 O 3 + MnO = 0.01 to 10%) Al 2 O 3 0 to 50% Ga 2 O 3 0 to 60% (Al 2 O 3 + Ga 2 O 3 = 5 to 60%) R 2 O 0 to 65% (R: at least one atom selected from Li, Na, K and Cs) R'O 0 to 70% (R': at least one atom selected from Mg, Ca, Sr and Ba) R 2 O + R'O 10 to 70% ZnO 0 to less than 30% Yb 2 O 3 0 to 10% GeO 2 0 to 20% ZrO 2 0 to 5% Ln 2 O 3 0 to 8% (Ln: at least one atom selected from Y, La, Gd, Lu, Sm, Dy, and Tm) and Sb 2 O 3 0 to 1%