Patent ID: 6899825
Filing Date: 2005-05-31
Classification: C09K

Abstract:
1. A bivalent metal silicate phosphor which comprises, as matrix crystal, a silicate containing, as constituting metal elements, calcium (Ca), magnesium (Mg) and silicon (Si) and which is activated by Europium (Eu), wherein lanthanum (La) is contained in the composition of the phosphor, which is represented by the formula (Ca 1-x Eu x )O·aMgO·bSiO 2 ·cLa 2 O 3 , wherein a, b, c and x are numbers satisfying the conditions of 0.9≦a≦1.1, 1.9≦b≦2.2, 0<c≦2.5×10 −2 and 5×10 −3 ≦x≦0.1, respectively.