Oxide fluorescent glass capable of exhibiting visible fluorescence

Abstract

A glass material is provided which is capable of exhibiting fluorescence in the visible region by ultraviolet ray excitation. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %): ______________________________________ SiO.sub.2 2 to 60%, B.sub.2 O.sub.3 5 to 70% (SiO.sub.2 + B.sub.2 O.sub.3 = 50 to 70%) RO 5 to 30% (R: at least one atom selected from Mg, Ca, Sr and Ba) ZnO 0 to 15% ZrO.sub.2 0 to 10%, Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3 2 to 15% (containing either of Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3) Ln.sub.2 O.sub.3 0 to 20% (Ln: at least one atom selected from Y, La, Gd, Yb, Lu, Sm, Dy and Tm) CeO.sub.2 0 to 1% Bi.sub.2 O.sub.3 0 to 2% Sb.sub.2 O.sub.3 0.01 to 0.5% and R'.sub.2 O 0 to 20% (R': at least one atom selected from Li, Na and K) ______________________________________

Dependencies are inferred from the claim text.