Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, PR China.
SSN Research Centre, SSN College of Engineering, Kalavakkam 603 110, Tamil Nadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Nov 5;204:537-547. doi: 10.1016/j.saa.2018.06.092. Epub 2018 Jun 27.
In the present work, the structural and optical properties of borotellurite glasses co-doped with Dy ions and Ag nanoparticles were investigated. From HR-TEM analysis, the average Ag nanoparticle diameter was calculated as 13.7 ± 1 nm. The negative sign of the bonding parameter explored the ionic nature of metal-ligand (DyO) bonds. The emission spectra exhibited three emission bands in blue, yellow and red regions corresponding to F → H, F → H and F → H transitions, respectively. The Yellow/Blue (Y/B) ratio of optimal BTD0.5A glass was found to be 1.881 and this low Y/B ratio indicated the fact that Dy ions were located in higher symmetrical ligand environment. The CCT values are found to vary from 3717 to 3800 K and hence the present glasses may emit cool white light when excited with UV lamp. The radiative parameters were calculated for all the emission transitions by using JO theory. The decay curves are found to show non-exponential behavior for all the studied glasses. The obtained results were discussed in detail and compared with similar reported glasses.
在本工作中，研究了共掺 Dy 离子和 Ag 纳米粒子的硼碲酸盐玻璃的结构和光学性质。从高分辨率透射电子显微镜（HR-TEM）分析中，计算出 Ag 纳米粒子的平均直径为 13.7±1nm。键参数的负号表明了金属-配体（DyO）键的离子性质。发射光谱显示出三个发射带，分别位于蓝色、黄色和红色区域，对应于 F→H、F→H 和 F→H 跃迁。最优 BTD0.5A 玻璃的黄色/蓝色（Y/B）比值为 1.881，这个低的 Y/B 比值表明 Dy 离子位于更高对称的配体环境中。色坐标（CCT）值发现从 3717 到 3800K 变化，因此当用紫外灯激发时，这些玻璃可能会发出冷白光。使用 JO 理论计算了所有发射跃迁的辐射参数。发现所有研究的玻璃的衰减曲线都呈现非指数行为。详细讨论了所得结果，并与类似的报道玻璃进行了比较。
