Abstract A series of novel K2Mg2(MoO4)3:xSm3+ (x = 0.005–0.05) orange-red emitting phosphors were synthesized by the solid-state method. The crystal structure and photoluminescence properties were investigated through the X-ray diffraction (XRD) and photoluminescence spectra. When excited by 406 nm, these phosphors exhibit intense orange-red emissions at 604 nm attributing to the 4G5/2 → 6H7/2 transitions of Sm3+ ions. The optimal Sm3+ ions concentration was determined to be 2 mol%, and the dipole–dipole interaction is responsible for the mechanism of concentration quenching. The photoluminescence intensity of K2Mg2(MoO4)3:0.02Sm3+ at 423 K is 71.1% of that at 303 K. The fluorescence decay lifetimes of obtained phosphors were calculated to be in the range of 1.829 to 1.759 ms. Furthermore, the CIE chromaticity coordinates of as-synthesized phosphors are situated in the region of orange-red. All the results manifest that these Sm3+-activated K2Mg2(MoO4)3 phosphors could be considered as potential orange-red candidates for white light emitting diodes (WLEDs).

中文翻译：

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用于白光发光二极管的新型 K2Mg2(MoO4)3:Sm3+ 橙红色荧光粉的光致发光性能

摘要 采用固态法合成了一系列新型 K2Mg2(MoO4)3:xSm3+ (x = 0.005–0.05) 橙红色荧光粉。通过X射线衍射（XRD）和光致发光光谱研究了晶体结构和光致发光性能。当被 406 nm 激发时，这些磷光体在 604 nm 处表现出强烈的橙红色发射，这归因于 Sm3+ 离子的 4G5/2 → 6H7/2 跃迁。最佳 Sm3+ 离子浓度确定为 2 mol%，偶极-偶极相互作用是浓度猝灭机制的原因。K2Mg2(MoO4)3:0.02Sm3+ 在 423 K 下的光致发光强度是 303 K 下的 71.1%。计算所得荧光粉的荧光衰减寿命在 1.829 至 1.759 ms 范围内。此外，合成后的荧光粉的 CIE 色度坐标位于橙红色区域。所有结果表明，这些 Sm3+ 激活的 K2Mg2(MoO4)3 荧光粉可被视为白光发光二极管 (WLED) 的潜在橙红色候选者。