Studies on Synthesis, Physical and Optical Properties of Dysprosium Ion-Doped Transparent Heavy Metal Oxide Glasses

The melt quench method was used to synthesize Dysprosium ions doped heavy metal oxide glasses of composition 50%TeO 2 –(30-x)%B 2 O 3 -10%Bi 2 O 3 –10%Na 2 O–x%Dy 2 O 3 (mol%) (x= 0, 0.2, 0.4, 0.6 and 0.8). The proof of glassy nature of prepared samples is substantiated by the X-ray diffractogram (XRD). Differential scanning calorimetry (DSC) is carried to obtain the value of glass transition temperature (Tg). Physical parameters such as polaron radius, density, inter-ions distance, lanthanide ion concentration and oxygen packing density (OPD) were calculated. Tauc’s plot is drawn to get information of energy band gap and hence refractive index. The distinctive absorption bands of dysprosium ions exist at 320, 348, 365, 387, 794, and 882 nm. The energy transitions from the 6 H 15/2 level to various higher levels of dysprosium ions are responsible for the UV-VIS-NIR absorption spectra. Using emissions monitoring at 576 nm, the excitation spectra was obtained between 200 and 550 nm. The 6 H 15/2 → 4 I 13/2 , 4 G 11/2 , 4 I 15/2 , and 4 F 9/2 transitions were identified as the sources of the excitation bands at 390, 426, 452 and 470 nm, respectively. Notable bands of emission were observed when stimulated at 447 nm for 485, 575, 662, and 756 nm wavelengths it is due to the energy transfer from 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 , 4 F 9/2 → 6 H 11/2 , and 4 F 9/2 → 6 H 9/2 , 6 F 11/2 . It was found the light emission from the samples was white.