Abstract
Using the sol-gel process, a series of Gd3+ doped CaAl4O7 samples were fabricated. Their crystal characteristics, surface morphologies, and spectral characteristics were analyzed using X-ray powder diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. XRD analysis reveals that the prepared phosphor exhibits a single monoclinic phase, indicating a well-defined crystal lattice. Under the excitation wavelength of 272 nm, weak and strong emission peaks were identified at 307 nm and 314 nm, which correspond to 6P5/2 → 8S7/2 and 6P7/2 → 8S7/2 transitions, respectively. A strong electron paramagnetic resonance (EPR) signal of the CaAl4O7:Gd3+ phosphor was observed at geff ∼ 2.16 and 1.94 along with several weak EPR signals that were observed at geff ∼ 14.8, 9.7, 5.6, 4.8, 3.7, 3.16, 2.7 and 1.5. The intense narrowband at 314 nm in the ultraviolet-B region makes prepared phosphor a promising candidate for phototherapy lamp applications. This study presents a comprehensive investigation of the Gd3+ doped CaAl4O7 phosphor, addressing its structural, and luminescent properties, which contributes to a deeper understanding of this material for various technological applications.
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