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A phosphor and a method of deposition. The phosphor comprises a composition of the formula M′aBa1-aM″2M′″4′; RE, where M′ is at least one element selected from magnesium and calcium, M″ is at least one element selected from aluminum, gallium and indium, M′″ is at least one element selected from sulphur, selenium and tellurium, RE is at least one rare earth element, especially europium or cerium, and 0
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