ABSTRACT Sm3+ and Pr3+ ion co-doped phosphors Ca3Y2Ge3O12:0.04Sm3+:yPr3+ (0.001≤y≤0.006 mol%) were synthesized by high tempereture calcination process. The XRD results showed that samples Ca3Y2Ge3O12:0.04Sm3+:yPr3+ (0.001≤y≤0.006) were matched well with the standard profile Ca3Y2Ge3O12 (PCSD No. 27-0092) which possessed a cubic structure with the space group Ia-3d (230), and these synthesized samples exhibited irregular particles with large size of about 40 μm. The photoluminescence (PL) study demonstrated that the co-doped Pr3+ ions could improve the PL properties through the energy transition (ET) process between Pr3+ ions and Sm3+ ions, leading to a smaller liftimes of Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+ than Ca3Y2Ge3O12:0.04Sm3+. The optimum Pr3+ ions doping concentration was y = 0.003 and the CIE coordinates (0.5249, 0.4730) of Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+ lied in red light region. Notably, sample Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+ exhibited better thermal stability and larger activation energy (Ea) by compariton of Ca3Y2Ge3O12:0.04Sm3+. Finally, the WLED device based on Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+, (Ba, Sr)2SiO4: Eu2+ and a blue chip of 395 nm exhibited a low correlated temperature (CCT) of 3929 K and a color rendering index (Ra) of 89.

中文翻译：

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Sm3+/Pr3+ 双激活 Ca3Y2Ge3O12:0.04Sm3+:Pr3+ 红色荧光粉，具有高热稳定性，适用于低相关温度 WLED

摘要 Sm3+和Pr3+离子共掺杂荧光粉Ca3Y2Ge3O12:0.04Sm3+:yPr3+(0.001≤y≤0.006 mol%)采用高温煅烧工艺合成。XRD结果表明样品Ca3Y2Ge3O12:0.04Sm3+:yPr3+ (0.001≤y≤0.006)与标准剖面Ca3Y2Ge3O12 (PCSD No. 27-0092)匹配良好，该剖面具有立方结构，空间群为Ia-3d (230) ，并且这些合成样品表现出约 40 μm 的大尺寸不规则颗粒。光致发光 (PL) 研究表明，共掺杂 Pr3+ 离子可以通过 Pr3+ 离子和 Sm3+ 离子之间的能量跃迁 (ET) 过程改善 PL 特性，导致 Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+ 比 Ca3Y2Ge3O12 的升程时间更小： 0.04Sm3+。最佳 Pr3+ 离子掺杂浓度为 y = 0.003，Ca3Y2Ge3O12:0 的 CIE 坐标为 (0.5249, 0.4730)。04Sm3+:0.003Pr3+ 位于红光区。值得注意的是，与 Ca3Y2Ge3O12:0.04Sm3+ 相比，样品 Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+ 表现出更好的热稳定性和更大的活化能 (Ea)。最后，基于 Ca3Y2Ge3O12:0.04Sm3+:0.003Pr3+、(Ba, Sr)2SiO4: Eu2+ 和 395 nm 蓝色芯片的 WLED 器件表现出 3929 K 的低相关温度 (CCT) 和显色指数 (Ra) 89.