xEr₂O₃–(1−x)CaMoO₄ (x = 1, 3, 5, 7 and 10 mol%) nanoparticles were synthesized by solid‐state sintering at 800°C. X‐ray diffraction studies confirmed the tetragonal crystal structure of CaMoO₄, while the doped samples show the co‐existence of cubic Er₂O₃ and tetragonal CaMoO₄ and rule out the replacement of Ca²⁺ by Er³⁺ in the structure. The crystal unit‐cell dimensions, phase concentration and atomic position coordinates were determined by Rietveld refinement. The short‐range structure of CaMoO₄ consists of tetrahedral MoO₄ and snub disphenoid deltahedral CaO₈ units, while the unit cell of Er₂O₃ consists of two types of ErO₆ octahedral units. All MoO₄ units contain Mo—O bonds of equal lengths, whereas two types of slightly different Ca—O bond lengths exist in CaO₈. Raman spectra of the doped samples show only Mo—O vibrational modes and the Raman peaks of Er₂O₃ are masked by Mo—O bond vibrations. CaMoO₄ shows bluish‐green emission at 500 nm, while Er‐doped samples show strong green emission under UV excitation. UV irradiation (380 nm) induces down‐conversion green emission at 531 nm and 552 nm and good color purity in 1 mol% Er₂O₃–CaMoO₄ sample which makes it a potential candidate for applications in optical devices.

中文翻译：

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掺Er的CaMoO4下转换磷光体的结构和光学表征

通过在800°C下进行固态烧结合成了x Er ₂ O ₃ –（1- x）CaMoO ₄（x = 1、3、5、7和10 mol％）纳米颗粒。X射线衍射研究证实了CaMoO ₄的四方晶体结构，而掺杂样品显示立方Er ₂ O ₃和四方CaMoO ₄共存，并排除了结构中Er ³⁺替代Ca ²⁺的可能性。晶体的晶胞尺寸，相浓度和原子位置坐标通过Rietveld精炼确定。CaMoO ₄的短程结构Er ₂ O _3的晶胞由四面体MoO ₄和冷双蝶形三角面CaO ₈单元组成，而Er ₂ O _3的晶胞由两种类型的ErO ₆八面体单元组成。所有的MoO ₄单元都包含相等长度的Mo-O键，而CaO _8中存在两种类型的Ca-O键长度略有不同。掺杂样品的拉曼光谱仅显示Mo-O振动模式，而Er ₂ O ₃的拉曼峰被Mo-O键振动掩盖。氧化钼₄在500 nm处显示蓝绿色发射，而掺Er的样品在UV激发下显示强绿色发射。紫外线（380 nm）引起531 nm和552 nm下转换绿色发射，并在1 mol％Er ₂ O ₃ -CaMoO ₄样品中具有良好的色纯度，使其成为光学设备中的潜在候选者。