OPTICAL ABSORPTION AND EMISSION IN MAGNESIUM TELLURITE DOPED ERBIUM GLASS EMBEDDED WITH NATURAL FERRITE NANOPARTICLES

Abstract

Glasses having compositions (89-x) TeO2-10MgO-1Er2O3-(x)Fe3O4, (x = 0 – 0.4 mol %) were prepared by conventional melt quenching technique. The glasses are characterized using XRD, UV-Vis-NIR and PL techniques. The amorphous structure of glasses was confirmed by the x-ray diffraction spectrum. The optical band gap and emission were determined from the optical absorption spectra in the spectral range of 350 - 1700 nm at room temperature. The energy band gap measured from the optical absorbance is found that the optical band gap decreased with increasing natural ferrite nanoparticles concentration. The emission spectra under 375 nm excitations exhibit four prominent peaks centered at 420, 458, 482, and 550 nm corresponding 4F3/2, 4F7/2, 2H11/2 and 4S3/2 → 4I15/2 transitions, respectively. In addition, the luminescence quenching is observed as the concentration of the natural ferrite nanoparticles is increased.