| http://www.w3.org/ns/prov#value | - As taught in US2006/0145123, a europium (Eu2+) activated silicate-based green phosphor has the general formula (Sr,A1)x(Si,A2)(O,A3)2+x:Eu2+ in which: A1 is at least one of a 2+ cation, a combination of 1+ and 3+ cations such as for example Mg, Ca, Ba, zinc (Zn), sodium (Na), lithium (Li), bismuth (Bi), yttrium (Y) or cerium (Ce); A2 is a 3+, 4+ or 5+ cation such as for example boron (B), aluminum
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