V Himamaheswara Rao, P Syam Prasad, M Mohan Babu, P Venkateswara Rao, T Satyanarayana, Luís F Santos, N Veeraiah
Department of Physics, National Institute of Technology Warangal, Warangal, 506004, Telangana, India.
Department of Physics, National Institute of Technology Warangal, Warangal, 506004, Telangana, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Jan 5;188:516-524. doi: 10.1016/j.saa.2017.07.013. Epub 2017 Jul 24.
Rare earth ion Dy-doped tellurite glasses were synthesised in the system of (75-x)TeO-15SbO-10WO-xDyO (TSWD glasses). XRD and FTIR characterizations were used to find the crystalline and structural properties. The intensities of the electronic transitions and the ligand environment around the Dy ion were determined using the Judd-Ofelt (J-O) theory on the absorption spectra of the glasses. The measured luminescence spectra exhibit intense emissions at 574 and 484nm along with less intense emissions around 662 and 751nm. Various radiative properties of the F excited level of Dy ion were calculated for the glasses. Decay profiles were measured to find the life times and quantum efficiencies. Yellow to blue intensity ratio (Y/B), CIE chromaticity coordinates and correlated color temperature (CCT) values are calculated using the emission spectra to evaluate the emitted light. The obtained results suggest the utility of the glasses for potential yellow laser and white LED's applications.
在(75 - x)TeO - 15SbO - 10WO - xDyO体系中合成了稀土离子Dy掺杂碲酸盐玻璃（TSWD玻璃）。利用XRD和FTIR表征来研究其晶体和结构性质。基于玻璃的吸收光谱，运用Judd - Ofelt（J - O）理论确定Dy离子周围的电子跃迁强度和配体环境。测得的发光光谱在574和484nm处有强发射，同时在662和751nm附近有较弱发射。计算了玻璃中Dy离子F激发态的各种辐射性质。测量衰减曲线以确定寿命和量子效率。利用发射光谱计算黄蓝强度比（Y/B）、CIE色度坐标和相关色温（CCT）值，以评估发射光。所得结果表明这些玻璃在潜在的黄色激光和白色发光二极管应用方面具有实用性。
