Abstract A series of double perovskite (Gd0.85-xLux)2MgTiO6: 0.3Eu3+ red phosphors were prepared via a typical high temperature solid-state reaction. XRD and HRTEM exhibits that the phosphors well crystallized as a double perovskite with the space group of P21/n symmetry. The luminescent properties of samples were investigated via excitation and emission spectra. The phosphors emit strong red light and weak orange red light under ultraviolet (UV) and near-UV excitation suggesting that Eu3+ ions situated in the sites without inversion symmetry. The UV–vis spectra included a broad host absorption band assigned to O2--Eu3+ and some peaks at 395 nm, 465 nm and 533 nm attributed to the typical f-f transition of Eu3+. The CIE chromaticity coordinates of all samples were near to the standard red light, indicating that the (Gd0.85-xLux)2MgTiO6: 0.3Eu3+ was a potential candidate material for red emitting phosphors. The decay curves matched with the lines fitted by a one exponential decay formula and the decay time increased with increasing Lu3+-dopant concentration within x

中文翻译：

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(Gd0.85-Lu )2MgTiO6: Eu3+红色荧光粉的发光特性、晶体结构和高热稳定性

摘要 通过典型的高温固相反应制备了一系列双钙钛矿(Gd0.85-xLux)2MgTiO6:0.3Eu3+红色荧光粉。XRD 和 HRTEM 表明磷光体很好地结晶为双钙钛矿，空间群为 P21/n 对称。通过激发和发射光谱研究样品的发光特性。在紫外 (UV) 和近紫外激发下，磷光体发出强红光和弱橙红光，表明 Eu3+ 离子位于没有反转对称性的位置。UV-vis 光谱包括分配给 O2--Eu3+ 的宽主体吸收带和 395 nm、465 nm 和 533 nm 处的一些峰，这些峰归因于 Eu3+ 的典型 ff 跃迁。所有样品的CIE色度坐标均接近标准红光，表明(Gd0.85-xLux)2MgTiO6:0。3Eu3+ 是一种潜在的红色荧光粉候选材料。衰减曲线与由一指数衰减公式拟合的直线相匹配，衰减时间随着 x 内 Lu3+-掺杂剂浓度的增加而增加