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.