Patent ID: 6287993
Filing Date: 2001-09-11
Classification: C03C,C09K

Abstract:
Long-lasting phosphorescent glass-ceramics having a composition in mol % of:SiO.sub.2 30-70% GeO.sub.2 0-10% MgO 5-40% MO 10-55%where M is an element or elements selected from the group consisting of Ca, Sr and BaB.sub.2 O.sub.3 0-15% Y.sub.2 O.sub.3 0-10% Sc.sub.2 O.sub.3 0-10% Al.sub.2 O.sub.3 0-10% Ga.sub.2 O.sub.3 0-15% MeO 0-10%where Me is an element or elements selected from the group consisting of Be, Zn, Cd and PbR.sub.2 O 0-6%where R is an element or elements selected from the group consisting of Li, Na and KCl + F 0-8% Bi.sub.2 O.sub.3 0-8% P.sub.2 O.sub.5 + ZrO.sub.2 + SnO.sub.2 0-6% and Sb.sub.2 O.sub.3 + As.sub.2 O.sub.3 0-4%,said composition further comprising in mol %, as an activator,Eu.sub.2 O.sub.3 0.0001-5%and, as an auxiliary activator,Ln.sub.2 O.sub.3 0.0001-6%where Ln is an element or elements selected from the group consisting of Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.