RVO4: Ln3+ (R=La, Gd; Ln=Sm, Er, Ho, Yb/Er) microcrystals were successfully synthesized by a facile and rapid sol-gel method using glycine as the chelating agent. The crystalline structure, morphology and luminescence properties of obtained products were investigated in detail. The peaks of X-ray diffraction (XRD) patterns were well-indexed to the standard RVO4 patterns, indicating that the Ln3+ ions were well doped into the crystalline lattices and had not changed the crystalline structure. The luminescence properties of the samples are systematically studied. The typical peaks of the emission spectra were sharp and intense, revealing energy was transferred efficiently from VO4 3- to Ln3+ after excitation. The schematic diagram for energy transfer between the host matrix and doped lanthanide ions were also discussed. The chromaticity coordinates of RVO4: Ln3+ microcrystals were calculated. This work reveals that the rare-earth vanadates are potential candidates as excellent host matrices of phosphors.

中文翻译：

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RVO4: Ln3+ (R=La, Gd; Ln=Sm, Er, Ho, Yb/Er) 微晶的溶胶-凝胶自燃合成和发光特性

RVO4：使用甘氨酸作为螯合剂，通过简便快速的溶胶-凝胶法成功合成了 Ln3+（R=La、Gd；Ln=Sm、Er、Ho、Yb/Er）微晶。详细研究了所得产物的晶体结构、形貌和发光性能。X 射线衍射 (XRD) 图案的峰与标准 RVO4 图案有很好的索引，表明 Ln3+ 离子很好地掺杂到晶格中并且没有改变晶体结构。系统地研究了样品的发光特性。发射光谱的典型峰尖锐而强烈，表明能量在激发后有效地从 VO4 3- 转移到 Ln3+。还讨论了主体基质和掺杂的镧系元素离子之间的能量转移示意图。计算了RVO4:Ln3+微晶的色度坐标。这项工作表明，稀土钒酸盐是作为优秀磷光体基质的潜在候选者。