Abstract Pulsed laser deposited barium tungstate films with different Tb3+ doping concentrations are prepared on quartz substrates. Their structural, morphological and optical properties are studied. All the films exhibit monoclinic crystalline structure with preferred direction of crystal growth along . Raman spectra of the films exhibit characteristic modes of WO42− ions. UV–visible spectra show that with increase in Tb3+ doping concentration, average transmittance increases and bandgap energy decreases. Surface morphology of the films with low doping concentration show distribution of fairly well defined larger grains and agglomerated grain growth is observed for films with higher doping concentration. Photoluminescence spectrum of pure BaWO4 film shows emission around 414 nm. The Tb3+doped films under an excitation wavelength of 270 nm exhibit intense peak around 488 nm originating from the 5D4→7F6 intra-shell transitions in Tb3+ ions. Excitation wavelength 335 nm reveals another peak around 545 nm arising from the 5D4→7F5 transition in Tb3+ ions. Ellipsometric analysis shows that the refractive index of films is in the range1.25–1.92 at 550 nm. The thickness of the films obtained from lateral FESEM images and ellipsometry are very close to each other.

中文翻译：

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发光的 Tb3+ 掺杂钨酸钡薄膜作为光子应用的潜在候选者

摘要 在石英衬底上制备了不同Tb3+掺杂浓度的脉冲激光沉积钨酸钡薄膜。研究了它们的结构、形态和光学特性。所有薄膜均表现出单斜晶体结构，晶体生长的优选方向为 。薄膜的拉曼光谱表现出 WO42- 离子的特征模式。紫外-可见光谱表明，随着 Tb3+ 掺杂浓度的增加，平均透射率增加，带隙能量降低。具有低掺杂浓度的薄膜的表面形态显示出相当明确的较大晶粒的分布，并且对于具有较高掺杂浓度的薄膜观察到团聚的晶粒生长。纯 BaWO4 薄膜的光致发光光谱显示在 414 nm 附近发射。270 nm 激发波长下的 Tb3+ 掺杂薄膜在 488 nm 附近表现出强烈的峰值，源于 Tb3+ 离子中的 5D4→7F6 壳内跃迁。激发波长 335 nm 揭示了在 545 nm 附近出现的另一个峰，该峰由 Tb3+ 离子中的 5D4→7F5 跃迁产生。椭偏分析表明，薄膜的折射率在 550 nm 的范围内为 1.25-1.92。从横向 FESEM 图像和椭偏仪获得的薄膜厚度彼此非常接近。