C(=O)([O-])[O-].[Sr+2].[S:6]([O-:10])([O-:9])(=[O:8])=[O:7].[Li+:11].[Li+].[S:13]([O-:17])([O-:16])(=[O:15])=[O:14].[Na+:18].[Na+]>[O-2].[Y+3].[O-2].[O-2].[Y+3].[O-2].[Ta+5].[O-2].[O-2].[O-2].[O-2].[Ta+5]>[S:6]([O-:10])([O-:9])(=[O:8])=[O:7].[Li+:11].[Li+:11].[S:13]([O-:17])([O-:16])(=[O:15])=[O:14].[Na+:18].[Na+:18]A method of making a yttrium tantalate phosphor, the method comprising forming an oxide mixture of yttrium oxide, tantalum oxide, and optionally strontium carbonate; adding a lithium sulfate-sodium sulfate mixed flux to the oxide mixture; and firing the mixture at a temperature and for a time sufficient to form the phosphor wherein the weight ratio of lithium sulfate to sodium sulfate is from about 1.0 to about 1.8.
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