Phosphorescent composition comprises an alkaline earth metal silicate doped with europium fluoride and another lanthanide fluoride. Independent claims are also included for: (1) producing a composition as above by grinding a mixture of alkaline earth metal carbonate or acetate and silica, calcining the mixture at 1100-1500[deg] C, adding the dopants, calcinining the mixture in a nitrogen/hydrogen atmosphere at 900-1000[deg] C, and cooling, grinding and screening the product; (2) product comprising a composition as above applied to a support that makes it visible at night; (3) timepieces with at least one component incorporating a product as above.
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Alternative title(s) : (de) Phosphoreszierende verbindungen (fr) Composés phosphorescents
Patent number | Country code | Kind code | Date issued |
DE602007011681 | DE | D1 | 2011-02-17 |
AT494349 | AT | T | 2011-01-15 |
EP1837387 | EP | B1 | 2011-01-05 |
EP1852488 | EP | A1 | 2007-11-07 |
EP1837387 | EP | A1 | 2007-09-26 |
US2007210282 | US | A1 | 2007-09-13 |