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A series of phosphors, Eu-doped Ca(Al/Si) 2 N 2 (N 1−x O x ), derivatives of CaAlSiN 3 , were synthesized by alloy-nitridation method. We demonstrated that their emission peaks can be tuned from 650nm to 610nm by oxygen preferential substitutions of nitrogen located at one of two crystallographic sites. Two luminescent centers corresponding to two types of Eu...
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