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Structural and spectroscopic characteristics of Eu3+-doped tungsten phosphate glasses

机译：掺Eu3 +的磷酸钨玻璃的结构和光谱特性

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摘要

Tungsten based phosphate glasses are interesting non-crystalline materials, commonly known for photochromic and electrochromic effects, but also promising hosts for luminescent trivalent rare earth ions. Despite very few reports in the literature, association of the hosts functionalities with the efficient emissions of the dopant ions in the visible and near-infrared spectra could lead to novel applications. This work reports the preparation and characterization of glasses with the new composition 4(Sb2O3)96-x(50WO(3) 50NaPO(3))xEu(2)O(3) where x = 0, 0.1, 0.25, 0.5 and 1.0 mol%, obtained by the melt quenching technique. The glasses present large density (similar to 4.6 g cm(-3)), high glass transition temperature (similar to 480 degrees C) and high thermal stability against crystallization. Upon excitation at 464 nm, the characteristic emissions of Eu3+ ions in the red spectral region are observed with high intensity. The Judd-Ofelt intensity parameters Omega(2) = 6.86 x 10(-20), Omega(4) = 3.22 x 10(-20) and Omega(6) = 8.2 x 10(-20) cm(2) were calculated from the emission spectra and found to be higher than those reported for other phosphate glass compositions. An average excited state lifetime value of 1.2 ms, was determined by fitting the luminescence decay curves with single exponential functions and it is comparable or higher than those of other oxide glasses. (C) 2015 Elsevier B.V. All rights reserved.
机译：钨基磷酸盐玻璃是有趣的非晶态材料，通常以光致变色和电致变色效应而著称，但它们还是发光三价稀土离子的有希望的主体。尽管文献报道很少，但是主机功能与可见光和近红外光谱中掺杂离子的有效发射的关联可能会导致新的应用。这项工作报告了具有新成分4（Sb2O3）96-x（50WO（3）50NaPO（3））xEu（2）O（3）的玻璃的制备和表征，其中x = 0、0.1、0.25、0.5和1.0摩尔％，通过熔融淬火技术获得。该玻璃具有大密度（约4.6 g cm（-3）），高玻璃化转变温度（约480摄氏度）和较高的抗结晶热稳定性。在464 nm处激发后，在红色光谱区域中以高强度观察到Eu3 +离子的特征发射。计算了Judd-Ofelt强度参数Omega（2）= 6.86 x 10（-20），Omega（4）= 3.22 x 10（-20）和Omega（6）= 8.2 x 10（-20）cm（2）由发射光谱测得的结​​果高于其他磷酸盐玻璃组合物所报道的那些。通过用单指数函数拟合发光衰减曲线确定平均激发态寿命值为1.2 ms，该值与其他氧化物玻璃相当或更高。 （C）2015 Elsevier B.V.保留所有权利。

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