A gamma‐ray irradiation assisted polyacrylamide gel method is used to synthesize the scheelite‐type barium tungstate (BaWO₄) phosphors with space group I41/a(88). Various instruments were employed to characterize and reveal the phase purity, microcosmic characteristics, chemical composition, surface micromorphology, colorimetric, optical and photoluminescence properties of BaWO₄ phosphors. The phase structure and functional group analysis showed that the formation temperature of pure BaWO₄ phosphor was 100 °C lower than calcium tungstate (CaWO₄) and strontium tungstate (SrWO₄). The characterization of particle growth showed that BaWO₄ was easy to grow along (112) and (200) crystal planes. The optical band gap (Eg) value of BaWO₄ first increases and then decreases with the increasing of sintering temperature. The sintering temperature causes the BaWO₄ xerogel to produce a variety of colors from black to white. The photoluminescence spectra showed that two obvious emission peaks at 380 and 415 nm are observed when the excitation wavelength is 334 nm. The former is ascribed to the T₁₍₂₎→A₁₍₁₎ transition and the latter could be attributed to the defect energy levels in the BaWO₄ phosphors. The intensity of emission peak at 380 nm decreases with the increasing sintering temperature. The photoluminescence mechanism of scheelite‐type BaWO₄ phosphor was explored on the basis of energy band theory and experimental results.

中文翻译：

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白钨矿型BaWO4荧光粉的γ射线辐照辅助聚丙烯酰胺凝胶合成及其比色，光学和光致发光性质

使用γ射线辐照辅助聚丙烯酰胺凝胶法合成空间群为I41 / a的白钨矿型钨酸钡（BaWO ₄）荧光粉（88）。使用各种仪器来表征和揭示BaWO ₄荧光粉的相纯度，微观特征，化学组成，表面微观形貌，比色，光学和光致发光性质。相结构和官能团分析表明，纯BaWO ₄荧光粉的形成温度比钨酸钙（CaWO ₄）和钨酸锶（SrWO ₄）低100°C 。颗粒生长的表征表明BaWO ₄很容易沿着（112）和（200）晶面生长。随着烧结温度的升高，BaWO ₄的光学带隙（Eg）值先增大然后减小。烧结温度使BaWO ₄干凝胶产生从黑色到白色的各种颜色。光致发光光谱表明，当激发波长为334 nm时，在380和415 nm处观察到两个明显的发射峰。前者归因于T _1（2） →A _1（1）跃迁，后者归因于BaWO ₄磷光体中的缺陷能级。380nm处的发射峰强度随着烧结温度的升高而降低。白钨矿型BaWO的光致发光机理根据能带理论和实验结果探索了_4种荧光粉。