Abstract Molybdates have applications in various fields such as phosphors, optical fibers, scintillators, magnets, sensors and catalysts. Thulium ion is an excellent blue activator and plays an important role in the design of persistent luminescent materials. This paper reports the investigation of the structural and luminescent properties of Barium Thulium Molybdate (Ba1−xTmx)MoO4 microcrystals (with x = 0, 0.01 or 0.03). The scheelite-type crystalline structure was identified from XRD and Raman studies. Under ultraviolet (359 nm) excitation, photoluminescence (PL) spectra present the characteristic emission bands at 453 nm and 545 nm which are due to the D 1 2 → F 3 4 and D 1 2 → H 3 4 , 5 transitions, respectively, from Tm3+ ions. Thermoluminescence (TL) measurements were performed with powdered samples previously irradiated with beta radiation. The depth of traps, associated with trap levels located inside the band-gap, was determined from TL data using different methods of glow curve analysis. The kinetic parameters, determined from thermoluminescent glow curves, provide evidence about a possible persistent luminescence emission from the (Ba0.97Tm0.03)MoO4 sample. This is a potential blue-light or ultraviolet long-lasting phosphor, with a trapping level lifetime, at room-temperature (300 K), of about 6 days.

中文翻译：

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Tm 3+ 掺杂的钼酸钡：一种潜在的长效蓝色荧光粉

摘要 钼酸盐在荧光粉、光纤、闪烁体、磁铁、传感器和催化剂等多个领域都有应用。铥离子是一种极好的蓝色活化剂，在持久发光材料的设计中起着重要作用。本文报告了对钼酸钡 (Ba1−xTmx)MoO4 微晶（x = 0、0.01 或 0.03）的结构和发光特性的研究。从 XRD 和拉曼研究中鉴定出白钨矿型晶体结构。在紫外 (359 nm) 激发下，光致发光 (PL) 光谱在 453 nm 和 545 nm 处呈现特征发射带，这分别是由于 D 1 2 → F 3 4 和 D 1 2 → H 3 4 , 5 跃迁，来自 Tm3+ 离子。热释光 (TL) 测量是用先前用 β 辐射照射的粉末样品进行的。陷阱的深度与位于带隙内的陷阱水平相关，是使用不同的辉光曲线分析方法从 TL 数据确定的。由热释光发光曲线确定的动力学参数提供了关于 (Ba0.97Tm0.03)MoO4 样品可能持续发光的证据。这是一种潜在的蓝光或紫外线长效荧光粉，在室温 (300 K) 下的俘获能级寿命约为 6 天。