Crystalline thin films of Eu, Dy, and Er-doped CaWO₄ and CaMoO₄ of thicknesses 100–150 nm were synthesized by pulsed laser deposition on fused silica substrates. The atomic force and scanning electron microscopy studies confirm uniform and dense surface morphology of the samples. Tetragonal CaWO₄ films show preferred growth of crystallites of (112) orientation. CaMoO₄ shows texturing of crystallites of (004) orientation, while (112) crystallites are favored upon doping with rare earth ions. CaWO₄ has a higher optical bandgap (5.0–5.2 eV) than CaMoO₄ (3.6–4.4 eV), and both materials show blue light emission with stronger luminescence in molybdate samples. Eu doped CaWO₄ and CaMoO₄ produce red light emission, while Er-doped samples emit green light. The samples 1 mol.% Dy₂O₃–CaWO₄ and 2 mol.% Eu₂O₃–5 mol.% Dy₂O₃–CaWO₄ exhibit white light emission properties.

中文翻译：

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稀土掺杂的CaWO4和CaMoO4薄膜用于白光发射

通过在熔融石英基体上脉冲激光沉积合成厚度为100-150 nm的Eu，Dy和Er掺杂的CaWO ₄和CaMoO ₄晶体薄膜。原子力和扫描电子显微镜研究证实了样品的均匀且致密的表面形态。四方CaWO ₄膜表现出优选的（112）取向微晶生长。CaMoO ₄显示出（004）取向的微晶组织，而掺杂稀土离子时（112）的微晶受到青睐。CaWO ₄具有比CaMoO ₄（3.6-4.4 eV）更高的光学带隙（5.0–5.2 eV），并且两种材料在钼酸盐样品中均显示出具有更强发光的蓝光发射。Eu掺杂CaWO ₄CaMoO ₄和CaMoO ₄发出红色光，掺Er的样品发出绿色光。1摩尔％Dy ₂ O ₃ -CaWO ₄和2摩尔％Eu ₂ O ₃ -5摩尔％Dy ₂ O ₃ -CaWO _4的样品表现出白光发射特性。