Long-lasting phosphorescent glasses and glass-ceramics
US6287993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Sep 17, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/77924
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Long-lasting phosphorescent glasses and glass-ceramics have a composition containing 30-65 mol % SiO.sub.2 and 20-50 mol % ZnO as basic ingredients and may also contain, as an activator or an auxiliary activator, 0-5 mol % Ln.sub.x O.sub.y where L n is an element or elements selected from the group consisting of Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Mn. In one aspect of the invention, long-lasting phosphorescent glass-ceramics have a composition containing 30-70 mol % SiO.sub.2, 5-40 mol % MgO and 10-55 mol % MO where M is an element or elements selected from the group consisting of Ca, Sr and Ba as basic ingredients. The composition further includes 0.0001-5 mol % Eu.sub.2 O.sub.3 as an activator and 0.0001-6 mol % Ln.sub.2 O.sub.3 as an auxiliary activator 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.