(Ca_1‐xEu_x)WO₄ (x = 0–21 mol%) phosphors were prepared using the classical solid‐state reaction method. The influence of Eu³⁺ ion doping on lattice structure was observed using powder X‐ray diffraction and Fourier transform infrared spectroscopy. Furthermore, under this influence, the luminescence properties of all samples were analyzed. The results clearly illustrated that the element europium was successfully incorporated into the CaWO₄ lattice with a scheelite structure in the form of a Eu³⁺ ion, which introduced a slight lattice distortion into the CaWO₄ matrix. These lattice distortions had no effect on phase purity, but had regular effects on the intrinsic luminescence of the matrix and the f–f excitation transitions of Eu³⁺ activators. When the Eu³⁺ concentration was increased to 21 mol%, a local luminescence centre of [WO₄]²⁻ groups was detected in the matrix and manifested as the decay curves of [WO₄]²⁻ groups and luminescence changed from single exponential to double exponential fitting. Furthermore, the excitation transitions of Eu³⁺ between different energy levels (such as ⁷F₀→⁵L₆, ⁷F₀→⁵D₂) also produced interesting changes. Based on analysis of photoluminescence spectra and the chromaticity coordinates in this study, it could be verified that the nonreversing energy transfer of [WO₄]²⁻→Eu³⁺ was efficient and incomplete.

中文翻译：

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轻微的结构变形对（Ca1-xEux）WO4发光材料的发光性能的影响

（Ca _1-x Eu _x）WO ₄（x = 0-21 mol％）荧光粉是使用经典的固态反应方法制备的。用粉末X射线衍射和傅里叶变换红外光谱观察到Eu ³⁺离子掺杂对晶格结构的影响。此外，在这种影响下，分析了所有样品的发光特性。结果清楚地表明，euro元素已成功地以Eu ³⁺离子形式的白钨矿结构掺入CaWO ₄晶格中，从而使CaWO ₄出现了轻微的晶格畸变。矩阵。这些晶格畸变对相纯度没有影响，但是对基质的固有发光和Eu ³⁺活化剂的f–f激发跃迁有规律的影响。当Eu ³⁺浓度增加到21 mol％时，在基质中检测到[WO ₄ ] ²⁻基团的局部发光中心，并表现为[WO ₄ ] ²⁻基团的衰减曲线，并且发光从单指数变化加倍指数拟合。此外，Eu的激发跃迁³⁺不同能级之间（如⁷ ˚F ₀ → ⁵大号₆，⁷F ₀ → ⁵ D ₂）也产生了有趣的变化。通过对光致发光光谱和色度坐标的分析，可以证明[WO ₄ ] ²⁻ →Eu ³⁺的不可逆能量转移是有效且不完全的。