Optical studies on novel Dy³⁺ ions doped telluroborate glasses for white light applications. P. 11

Novel Dy³⁺ ions doped alkali telluroborate glasses were prepared following the melt-quenching technique by replacing the borate content with Dy³⁺ ions content. The optical behavior of the title glasses was explored through UV-Vis-NIR absorption, luminescence spectra and decay measurements. The ionic or covalent nature was determined with the help of Nephelauxetic effect through the energy positions observed in the absorption spectra using Nephelauxetic ratio and bonding parameters. The Yellow/Blue ratios were estimated from the luminescence spectra to determine the degree of asymmetry around the dopant (Dy³⁺) ions in the prepared glasses. The luminescence intensity is found to quench beyond 1.0 wt% of Dy³⁺ ions doped alkali telluroborate glasses which may be due to the resonance energy transfer or cross-relaxation phenomena takes place between the nearby Dy³⁺ ions and is analyzed with Inokuti-Hirayama model. (author)