Synthesis, Energy Transfer, and Photoluminescence Optimization of Ce^³⁺/Eu^³⁺ Co-Doped Ba_₂Al_₂SiO_₇ Phosphors for White LED Applications

Solid-state reaction technique has synthesized a new efficient phosphor, Ce۳+, and Eu۳+ activated at high temperature. Structural properties were analyzed using powder X-ray diffraction and high-resolution transmission electron microscopy. The optical properties were examined using ultraviolet-visible light spectroscopy and Fourier transform infrared spectroscopy, while the luminescence properties were investigated through a photoluminescence (PL) technique. The crystal structure of the synthesized host and Ce۳+ and Eu۳+ activated phosphors were examined and determined to exhibit a hexagonal structure. The PL excitation spectra of Ba₂Al₂SiO₇: Ce–Eu phosphor exhibit narrow bands in the near-UV region, while the PL emission spectra show sharp, well-defined peaks characteristic of rare-earth ion transitions. The excitation peaks for : Ce-Eu are in the near ultraviolet range. The results indicate that these phosphors may benefit the lamp industry. The emission spectrum demonstrated a prominent peak at ۴۲۰ nm, with smaller peaks at ۵۸۰ nm, ۵۹۵ nm, ۶۱۵ nm, ۶۳۶ nm, and ۶۵۸ nm. The wide peak at ۴۲۰ nm is utilized for the excitation spectrum. The results indicate that these phosphors are promising candidates for lamp and solid-state lighting applications. Furthermore, the novelty of this work lies in the successful Ce³⁺/Eu³⁺ co-activation of the Ba₂Al₂SiO₇ host, which enables enhanced luminescence behavior, effective near-UV excitation, and tunable blue-red emission characteristics suitable for advanced photonic and white LED applications.

کلیدواژه ها:

Ba₂Al₂SiO₇ ، Ce&sup۳ ، ⁺/Eu&sup۳ ، ⁺ co-doping ، Photoluminescence ، Rare-earth phosphors ، Solid-state lighting ، Energy transfer