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PL and ESR Study on UVB-Emitting Gadolinium-Doped BaMgAlO Hexagonal Phase Obtained by Combustion Synthesis

Journal of Electronic Materials, ISSN: 0361-5235, Vol: 47, Issue: 12, Page: 7365-7371
2018
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A series of Gd-doped BaMgAlO 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 Gd dopant in BaMgAlO 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 g ≈ 1.98. 2.7, 4.2, and 5.95 in phosphors with low concentration of dopant Gd ion. At higher dopant concentrations, the spectrum appeared to be U-like with prominent lines at g ≈ 1.99, 2.7, 4.2, and 5.94. Distortions in the neighborhood of Gd ion led to ESR lines in the low-field region of the spectrum.

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