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首页> 外文期刊>International Journal of Quantum Chemistry >IRRS, UV-Vis-NIR absorption and photoluminescence upconversion in Ho3+-doped oxyfluorophosphate glasses
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IRRS, UV-Vis-NIR absorption and photoluminescence upconversion in Ho3+-doped oxyfluorophosphate glasses

机译：掺Ho3 +的氧氟磷酸盐玻璃的IRRS，UV-Vis-NIR吸收和光致发光上转换

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摘要

Infrared reflection spectroscopic (IRRS), Ultraviolet-visible-near infrared (UV-Vis-NIR) absorption and photoluminescence upconversion properties with special emphasis on the spectrochemistry of the oxyfluorophosphate (oxide incorporated fluorophosphates) glasses of the Ba(PO3)(2)-AlF3-CaF2-SrF2-MgF2-Ho2O3 system have been studied with different concentrations (0.1, 0.3 and 1.0mol%) of Ho2O3. IRRS spectral band position and intensity of Ho 3, ion doped oxyfluorophosphate glasses have been discussed in terms of reduced mass and force constant. UV-Vis-NIR absorption band position has been justified with quantitative calculation of nephelauxetic parameter and covalent bonding characteristics of the host. NIR to visible upconversion has been investigated by exciting at 892nm at room temperature. Three upconverted bands originated from the F-5(3)->I-5(8), (S-5(2), F-5(4))->I-5(8) and F-5(5)->I-5(8) transitions have found to be centered at 491 nm (blue, medium), 543 run (green, very strong) and 658 nm (red, weak), 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), energy transfer (ET) and cross relaxation (CR) mechanisms involving population of the metastable (storage) energy levels by multiphonon deexcitation effect. It is evident from the IRRS study that the upconversion phenomena are expedited by the low multiphonon relaxation rate in oxyfluorophosphate glasses owing to their high intense low phonon energy (similar to 600cm(-1)) which is very close to that of fluoride glasses (500-600cm(-1)). (c) 2005 Elsevier Inc. All rights reserved.
机译：红外反射光谱（IRRS），紫外-可见-近红外（UV-Vis-NIR）吸收和光致发光上转换特性，特别着重于Ba（PO3）（2）-的氟代磷酸盐玻璃（含氧化物的氟代磷酸盐）玻璃的光谱化学研究了AlF3-CaF2-SrF2-MgF2-Ho2O3体系与不同浓度（0.1、0.3和1.0mol％）的Ho2O3的关系。已经讨论了降低质量和力常数的Ho 3离子掺杂的氟氧磷酸盐玻璃的IRRS光谱带位置和强度。 UV-Vis-NIR吸收带的位置已经通过定量计算肾素参数和主体的共价键特征得到了证明。已经通过在室温下在892nm处激发来研究近红外到可见光上转换。来自F-5（3）-> I-5（8），（S-5（2），F-5（4））-> I-5（8）和F-5（5）的三个上变频频段）-> I-5（8）的过渡分别位于491 nm（蓝色，中），543 run（绿色，非常强）和658 nm（红色，弱）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），能量转移（ET）和交叉弛豫（CR）机制进行了解释，该机制涉及通过多声子去激励效应引起的亚稳态（存储）能级的聚集。从IRRS研究中可以明显看出，氧氟磷酸盐玻璃的多声子弛豫速率低，这是因为其高强度的低声子能量（约600cm（-1））加速了上转换现象，该能量非常接近氟化物玻璃（500cm）。 -600cm（-1））。 （c）2005 Elsevier Inc.保留所有权利。

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