METAL SILICATE-SILICA-BASED POLYMORPHOUS PHOSPHORS AND LIGHTING DEVICES

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Provided, among other things, is a phosphor according to the formula : [(BvSiO3)x(Mv2SiO3)y(Tv2(SiO3)3)z]m.(SiO2)n : Repsilon, X (I) wherein x, y and z are any value such that x+y+z=1; Bv is one or more divalent alkaline earth metals; Mv is one or more monovalent alkaline metals; Tv is one or more trivalent metal ions; Repsilon is one or more activators selected from Eu2+ and Mn2+; X is one or more halides; m is 1 or 0; and (i) n>3 if m=1 and provides an amount of silica effective to host useful luminescence or (ii) n=1 if m=0.