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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >FT-IRRS, UV-Vis-NIR absorption and green upconversion in Er3+ doped lead silicate glass
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FT-IRRS, UV-Vis-NIR absorption and green upconversion in Er3+ doped lead silicate glass

机译：掺Er3 +的硅酸铅玻璃的FT-IRRS，UV-Vis-NIR吸收和绿色上转换

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摘要

Fourier transform infrared reflection spectroscopic (FT-IRRS), ultraviolet-visible-near infrared (UV-Vis-NIR) absorption and green upconversion fluorescence properties of an Er3+ ion doped high PbO (72.5 wt.%) content lead silicate glass have been studied at room temperature. FT-IRRS and UV-Vis-NIR absorption spectral band positions have been discussed quantitatively with theoretical calculation and covalent bonding characteristics of the glass respectively. NIR radiation upconversion into green fluorescence has been investigated by exciting at 979 nm. Two green upconverted bands with doublet characteristics originating from S-4(3/2) --> I-4(15/2) and H-2(11/2) --> I-4(15/2) transitions have been found to be centered at 550 (strong) and 530 (weak) nm respectively. These bands have been justified from the evaluation of the absorption, normal (down conversion) fluorescence and excitation spectra. The upconversion processes have been explained by the excited state absorption (ESA) and energy transfer (ET) mechanisms involving population of energy levels by multiphonon deexcitation and thermal effects. It is evident from IRRS studies that the upconversion phenomenon is expedited by the low multiphonon relaxation rate in lead silicate glass owing to its low phonon energy (990 cm(-1)) compared to that in silica glass (1122 cm(-1)). (C) 2004 Elsevier B.V. All rights reserved.
机译：研究了掺Er3 +离子的高PbO（72.5 wt。％）铅硅酸盐玻璃的傅里叶变换红外反射光谱（FT-IRRS），紫外可见-近红外（UV-Vis-NIR）吸收和绿色上转换荧光特性。在室温下。分别通过理论计算和玻璃的共价键特征对FT-IRRS和UV-Vis-NIR吸收光谱带位置进行了定量讨论。已通过在979 nm处激发来研究NIR辐射上转换为绿色荧光的过程。从S-4（3/2）-> I-4（15/2）和H-2（11/2）-> I-4（15/2）过渡产生的具有双重特征的两个绿色上变频带具有被发现分别位于550（强）和530（弱）nm的中心。从吸收，正常（下转换）荧光和激发光谱的评估中可以证明这些带是合理的。上转换过程已通过激发态吸收（ESA）和能量转移（ET）机理进行了解释，该机理涉及通过多声子去激磁和热效应引起的能级分布。从IRRS研究中可以明显看出，硅酸铅玻璃的声子能量较低（990 cm（-1）），而石英玻璃（1122 cm（-1））具有较低的声子弛豫速率，因此上转换现象得以加快。 。 （C）2004 Elsevier B.V.保留所有权利。

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