Rare earth-alkaline earth metal fluorohalide immunopotentiating production of fluorescencer

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A method of preparing a rare earth activated, alkaline earth metal fluorohalide based phosphor comprising the steps of : (a) providing a phosphor material, which includes BaFBr particles, and a phosphor material, which includes BaFI particles, wherein the average particle diameter of the BaFI particles is no more than four times the average particle diameter of the BaFBr particles; (b) mixing the phosphor materials together to thereby obtain a mixture of the phosphor materials; and (c) calcining the mixture of phosphor materials.