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A series of Gd3+-doped BaMgAl10O17 phosphors have been successfully synthesized using a low-temperature solution combustion method. The crystal structure and phase purity of the samples were characterized using x-ray powder diffraction analysis. The optimal concentration of Gd3+ dopant in BaMgAl10O17 was determined through measurements of the photoluminescence spectra of the phosphors. All phosphors showed narrowband UVB emission at 313 nm with excitation wavelength at 272 nm. Relatively dominant electron spin resonance (ESR) lines were observed with geff ≈ 1.98. 2.7, 4.2, and 5.95 in phosphors with low concentration of dopant Gd3+ ion. At higher dopant concentrations, the spectrum appeared to be U-like with prominent lines at geff ≈ 1.99, 2.7, 4.2, and 5.94. Distortions in the neighborhood of Gd3+ ion led to ESR lines in the low-field region of the spectrum. [ABSTRACT FROM AUTHOR]

Abstract Undoped Y 2 O 3 and Gd3+-doped Y 2 O 3 samples were synthesized using a sol-gel method. The samples were characterized by X-ray powder diffraction (XRD), a scanning electron microscope (SEM), photoluminescence (PL), and electron paramagnetic resonance (EPR). The room-temperature PL spectrum was recorded to study the bands that are due to the Gd3+. The photoluminescence analyses of the sample confirm the presence of the Gd3+ ions in the Y 2 O 3 matrix. EPR spectra of the samples confirmed the presence of Gd3+ ions in Y3+ sites with cubic symmetry. [ABSTRACT FROM AUTHOR]