Wet Chemically Synthesized Optical Investigation Of Tb3+/Eu3+ Activated/Co-Activated Batio3 Phosphors By Energy Transfer Mechanism

Abstract

In recent years, rare-earth-doped inorganic phosphors have gained significant attention in the field of display technologies. In this study, BaTiO₃ phosphors doped and co-doped with Tb³⁺ and Eu³⁺ ions were synthesized using the wet chemical method. The crystal structure and phase composition of the obtained phosphors were characterized through X-ray diffraction (XRD) combined with Rietveld refinement. Surface morphology and elemental composition were investigated using scanning electron microscopy (SEM) along with elemental analysis. Photoluminescence (PL) studies revealed that, under excitations at 265 nm, 395 nm, and 465 nm, Eu³⁺-doped and Tb³⁺/Eu³⁺ co-doped BaTiO₃ phosphors displayed prominent emissions: an orange peak at 595 nm and a red peak at 614 nm corresponding to the ⁵D₀ → ⁷F₁ and ⁵D₀ → ⁷F₂ transitions of Eu³⁺, respectively, while Tb³⁺ doping yielded green emission. Upon satisfying the spectral overlap condition, co-doping both ions in the host matrix resulted in photoluminescence with color tunability from green to red. These findings suggest that the synthesized phosphors are promising candidates for white light-emitting diodes (WLEDs) and display device applications.