| http://www.w3.org/ns/prov#value | - This step produces a trivalent europium compound by (a) mixing at a certain proportion, for example, a europium compound (such as, europium oxide, europium fluoride, or europium chloride) with a raw material, such as one of the aluminum compounds, the magnesium compounds, the phosphor compounds, the silicon compounds, or the boron compounds described above and (b) chemically reacting the raw mater
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