Structural and luminescence investigations of Gd3+ - Er3+ doped in lithium aluminum borate glasses using XANES and EXAFS techniques

초록

The typical melt quenching technique was utilized to produce a possibly unique series of Gd3+ and Er3+ dual doped borate glasses with a composition of 25Li<inf>2</inf>O–5Al<inf>2</inf>O<inf>3</inf>-XGd<inf>2</inf>O<inf>3</inf>-(69.0-X)B<inf>2</inf>O<inf>3</inf>-1.0Er<inf>2</inf>O<inf>3</inf>. The amorphous nature and information on chemical bindings of the materials were validated by using fundamental characterization techniques such as X-ray diffraction, Fourier transform infrared, X-ray absorption near-edge structure, and optical screening to identify their features (absorption, excitation, and emission). The refractive index of the glasses improves from 1.5487 to 1.628 as the concentration of Gd<inf>2</inf>O<inf>3</inf> increases. The optical absorption spectra of Er3+ doped glasses were measured from the ultraviolet (UV) through the visible (Vis) and near infrared (NIR) ranges with varying Gd<inf>2</inf>O<inf>3</inf> concentrations in order to determine their optical properties. This luminescence was found to be predominant in photoluminescence spectra, which were obtained at an optimum doping Gd<inf>2</inf>O<inf>3</inf> concentration of 7.5 mol%. The impact of Er3+ doping was assessed through photoluminescence, which exhibited a broad, intense NIR band at 1537 nm ascribed to the 4I<inf>13/2</inf> → 4I<inf>15/2</inf> transition of Er3+ ions at λ<inf>Ex</inf> = 486, 526, 651, and 978 nm excitation, which exhibits outstanding increased intensity with the Er3+ concentration until it reaches 1.0 mol %. A look at visible and near-infrared optical, it is observed that LAGd7.5BEr1.0 glass is a more potential candidate for photonic devices. © 2023

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