Souadi G, Hakami O, Kaynar U H, Coban M B, Aydin H, Madkhali O, Zelai T, Ayvacikli M, Can N
Jazan University, College of Science, Department of Physical Sciences, Physics Division, P.O. Box 114, 45142, Jazan, Kingdom of Saudi Arabia.
Jazan University, College of Science, Department of Physical Sciences, Chemical Division, P.O. Box 114, 45142, Jazan, Kingdom of Saudi Arabia; Nanotechnology Research Unit, College of Science, Jazan University, P.O. Box. 114, Jazan, 45142, Kingdom of Saudi Arabia.
Appl Radiat Isot. 2024 Dec;214:111529. doi: 10.1016/j.apradiso.2024.111529. Epub 2024 Sep 25.
This study investigates the structural and photoluminescence (PL) characteristics of Tb-incorporated KY(BO) (KYBO) phosphors synthesized via a microwave-assisted sol-gel technique. X-ray diffraction (XRD) and Rietveld refinement confirmed the formation of a pure hexagonal phase, with lattice expansion due to Tb³⁺ doping. PL studies revealed strong green emissions centered at 541 nm, attributed to the ⁵D₄ → ⁷F₅ transitions of Tb³⁺ ions, with the highest intensity observed at 5 wt% Tb³⁺. A decrease in emission was observed at higher concentrations due to concentration quenching. Temperature-dependent PL measurements revealed reverse thermal quenching enhancing PL intensity. Chromaticity analysis based on CIE 1931 coordinates showed stable green emission across all concentrations, with a maximum color purity of 89.74% observed for the KYBO:3 wt% Tb³⁺ sample. The results, along with reverse thermal quenching behavior observed between 470K and 550K, suggest that these phosphors exhibit excellent potential for lighting and display technologies.
