Zmojda J, Kochanowicz M, Miluski P, Dorosz D, Jelen P, Sitarz M
Department of Power Engineering, Photonics and Lighting Technology, Bialystok University of Technology, 45D Wiejska Street, 15-351 Bialystok, Poland.
Department of Power Engineering, Photonics and Lighting Technology, Bialystok University of Technology, 45D Wiejska Street, 15-351 Bialystok, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Oct 15;131:702-7. doi: 10.1016/j.saa.2014.05.047. Epub 2014 Jun 2.
In the work the new glass compositions in the GeO2-GaO-BaO system have been prepared and thermal, structural properties of in germanate glasses co-doped with Yb(3+)/Tb(3+)ions were studied. Glasses were obtained by conventional high-temperature melt-quenching technique. The study of the crystallization kinetics processes of glasses co-doped with 0.7Yb2O3:0.7Tb2O3 was performed with DSC measurements. The activation energies have been calculated using Freedman analysis and verified with the Flynn-Wall-Ozawa method. In this order, the DSC curves have been registered with different heating rates, between 5 and 15 degrees/min. The structure of fabricated glasses has been studied by infrared and Raman spectroscopes. The effect of heat treatment on the structural properties was determined. In all glass samples the dominated infrared absorbance band at 800cm(-1) corresponds to asymmetric stretching motions of GeO4 tetrahedra containing bridging (Ge-O(Ge)) and non-bridging (Ge-O(-)) oxygens. Additionally, the influence of heat treatment on the luminescent properties was evaluated. Strong luminescence at 489, 543, 586 and 621nm corresponding to (5)D4→(7)FJ (J=6, 5, 4, 3) transitions was measured. The highest upconversion emission intensity was obtained in the germanate glass co-doped with 0.7Yb2O3/0.7Tb2O3.
在这项工作中，制备了GeO2-GaO-BaO系统中的新型玻璃组合物，并研究了共掺杂Yb(3+)/Tb(3+)离子的锗酸盐玻璃的热性能和结构性能。通过传统的高温熔体淬火技术获得玻璃。采用DSC测量对共掺杂0.7Yb2O3:0.7Tb2O3的玻璃的结晶动力学过程进行了研究。使用弗里德曼分析计算了活化能，并用弗林-沃尔-小泽方法进行了验证。为此，在5至15度/分钟的不同加热速率下记录了DSC曲线。通过红外光谱仪和拉曼光谱仪研究了所制备玻璃的结构。确定了热处理对结构性能的影响。在所有玻璃样品中，800cm(-1)处占主导地位的红外吸收带对应于含有桥连(Ge-O(Ge))和非桥连(Ge-O(-))氧的GeO4四面体的不对称拉伸运动。此外，评估了热处理对发光性能的影响。测量到在489、543、586和621nm处对应于(5)D4→(7)FJ (J = 6、5、4、3)跃迁的强发光。在共掺杂0.7Yb2O3/0.7Tb2O3的锗酸盐玻璃中获得了最高的上转换发射强度。
