| http://www.w3.org/ns/prov#value | - In embodiments, the phosphor is M???aBa1-aM???2M??????4???RE, where M??? is selected from magnesium and calcium, M??? is selected from aluminum, gallium and indium, M?????? is selected from sulphur, selenium and tellurium, and RE is a rare earth element, especially europium and cerium.
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