Photoluminescence of Er<sup>3+</sup>: PbO - B<sub>2</sub>O<sub>3</sub> - TeO<sub>2</sub> Glass under 650nm Excitation Wavelength

Abstract

Erbium doped borotellurite glass has been identified as one of the most potential candidate for optical applications due to their excellent in physical and chemical properties. Therefore, the aim of this study is to identify the optical properties by mean of their UV-Vis and photoluminescence spectroscopic of the Er3+ doped borotellurite glass. In this work, erbium doped borotellurite glass, (80-x)TeO2-10 B2 O3-10PbO-xEr2O3, where 0.5 mol % x 2.0 mol % has been successfully fabricated by using melt-quenched techniques. The glass obtained is in good quality since it shows no sign of devitrification. The glass sample has undergone some physical and optical measurements. From the XRD results, it confirms that the glass is in amorphous nature. Meanwhile, it is found that the density of the glass sample increases from 4.4187 gcm-3 to 4.5769 gcm-3 with respect to Er content. For the optical properties, the absorption spectra were measured by UV-Vis-NIR spectrophotometer in the range 400-900 nm interval. From the absorption spectra, the 650 nm excitation wavelength is found to be the most predominant peaks. From the photoluminescence spectra, five significant emission peaks have been observed where by four of them is in the visible regions which is corresponds to 440 nm, 486 nm, 520 nm and 650 nm wavelength while the other one is in NIR regions at 794 nm. Some other results were also been analyzed and presented.