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Effect of lead fluoride incorporation on the structure and luminescence properties of tungsten sodium phosphate glasses

机译：氟化铅的掺入对磷酸钨钠玻璃结构和发光性能的影响

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摘要

Tungsten phosphate glasses are known to be promising materials for several applications in optics such as non linear optical properties, lower phonon energy or photochromic effects related with tungsten oxide incorporation inside the phosphate network. In this study, lead fluoride has been incorporated in a 60NaPO(3)-40WO(3) glass composition according to the ternary molar compositions (100 - x) [0.6NaPO(3)-0.4WO(3)]-xPbF(2) with x varying from 0 to 60 mol%. The structural changes as a function of composition were investigated by thermal analysis, UV-visible absorption, Raman spectroscopy, X-ray diffraction of the crystallized samples, and Eu3+ emission in the visible. While DSC analyzes points out a strong decrease in the glass network connectivity and higher crystallization tendency with increasing PbF2 contents, Raman spectra clearly identify a progressive incorporation of PbF2 in the phosphate network with the formation of terminal P-F and W-F bonds. These results are also in agreement with the crystallization of beta-PbF2 observed for the most lead fluoride concentrated samples. Investigation of Eu3+ emission data in the visible showed longer D-3(0) excited state lifetime values and higher quantum efficiencies. These results are discussed in terms of the assumption of higher local symmetry around Eu3+ with increasing PbF2 contents. (C) 2015 Elsevier B.V. All rights reserved.
机译：已知磷酸钨玻璃是在光学中有多种应用的有前途的材料，例如非线性光学性能，较低的声子能量或与磷光体网络内部掺入氧化钨有关的光致变色效应。在这项研究中，根据三元摩尔组成（100-x）[0.6NaPO（3）-0.4WO（3）]-xPbF（2），氟化铅已掺入60NaPO（3）-40WO（3）玻璃组成中），其中x在0至60 mol％之间变化。通过热分析，紫外可见吸收，拉曼光谱，结晶样品的X射线衍射以及可见光中的Eu3 +发射，研究了结构变化与成分的关系。 DSC分析指出，随着PbF2含量的增加，玻璃网络的连通性会大大降低，并且具有更高的结晶趋势，而拉曼光谱清楚地表明PbF2在磷酸盐网络中的逐步掺入以及末端P-F和W-F键的形成。这些结果也与在大多数氟化铅浓缩样品中观察到的β-PbF2结晶一致。对可见光中Eu3 +发射数据的研究表明，更长的D-3（0）激发态寿命值和更高的量子效率。这些结果是根据在Eu3 +周围具有较高局部对称性且PbF2含量增加的假设来讨论的。 （C）2015 Elsevier B.V.保留所有权利。

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