Abstract
Two series of Eu-doped (Sr,Ln)9MgK(PO4)7 (Ln = Y and La) solid-solution phosphors are synthesized and their crystal structure and luminescence properties are studied in detail. The luminescence of Eu3+ and Eu2+ ions are detected in Eu-doped Sr9MgK(PO4)7 phosphor synthesized in a reducing atmosphere. Y3+ and La3+ ions, being as representive of rare earth ions, are incorporated into Eu-doped Sr9MgK(PO4)7 phosphor. It is observed that the luminescence performance is significantly improved, indicating that the incorporation of Ln3+ ions leads to the stabilization of the Eu2+ ions under reductive atmosphere. Under the 370 nm radiation excitation, the luminescence intensities of Sr7.45YMgK(PO4)7:0.05Eu2+ and Sr7.45LaMgK(PO4)7:0.05Eu2+ are found to be about 4.2 and 6.4 times that of Sr8.95MgK(PO4)7:0.05Eu2+, respectively. Therefore, our results suggest that the proposed strategy is feasible to be applied in other Eu2+/3+-coexisting phosphor systems.
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