Patent ID: 8277687

Claim:
A phosphor represented by formula (1): M 1 3−x−y Ba x M 2 y M 3 a M 4 b M 5 c M 6 d (1) wherein M 1 represents at least one element selected from the group consisting of Zn, Be, Mg, C, Sr, and Ra, M 2 represents at least one element selected from the group consisting of Eu, Ce, Cr, Mn, Sm, Tm, Tb, Er, and Yb, M 3 represents Si and optionally at least one other tetravalent element, M 4 represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Fr, La, Gd, P, Sb, Al, Pr, Sm, Yb, and Bi, M 5 represents at least one element selected from the group consisting of F, Cl, Br, I, and At, M 6 represents at least one element selected from the group consisting of N, O, and S, 0.5 ≦x≦ 1.2, 0 <y< 1, 0<3 −x−y, 0.5≦ a≦ 1.5, 0≦ b≦ 0.6, 0 ≦c ≦0.3, 4.5 ≦d≦ 5.5, b+c≧0, and wherein said phosphor has a material present on a surface of the phosphor that comprises at least one member selected from the group consisting of magnesium oxide, aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, tin oxide, germanium oxide, tantalum oxide, niobium oxide, vanadium oxide, boron oxide, antimony oxide, zinc oxide, yttrium oxide, bismuth oxide, silicon nitride, aluminum nitride, calcium phosphate, barium phosphate, strontium strontium phosphate, present on a surface of the phosphor in an amount of from 1 to 50 percent by weight, relative to the total weight of the phosphor.