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Novel red‐emitting phosphors, Eu3+‐activated M7Sn(PO4)6 (M = Sr, Ba), were synthesized at 1200°C by conventional solid‐state reaction method. The luminescent properties of M7Sn(PO4)6:Eu3+ (M = Sr, Ba) phosphors were investigated, and the critical concentration of the activator (Eu3+) concentration were found to be 0.175 mol and 0.21 mol per formula unit for Sr7‐xSn(PO4)6:xEu3+ and Ba7‐xSn(PO4)6:xEu...
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