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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.
Anne-Sophie Chauvin, Julien Alexandre Andres
Berend Smit, Kevin Sivula, Nestor Guijarro Carratala, Kyriakos Stylianou, Gloria Capano, Andrzej Gladysiak, Christopher Patrick Ireland, Maria Fumanal Quintana, Stavroula Kampouri, Davide Tiana, Samantha Lynn Anderson