Investigation of optical properties of Mn4+ doped ZnAl2O4 phosphor fabricated by sol-gel method
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Abstract
In this work, ZnAl2O4: Mn4+ phosphor is prepared by the sol-gel method. The phase structure was investigated by X-ray diffraction (XRD), and morphology and element composition were analyzed by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), luminescent performance of the phosphor using photoluminescence (PL) spectra, and Raman spectroscopy. The obtained powder shows a red broad emission band peaking at 676 nm and 692 nm, corresponding to the energy transfer of electrons from 2Eg to 4A2g. The Mn4+ concentration is doped at 0.5 mol% into the ZnAl2O4 host lattice. After that, the powder annealed at 1200℃ for 4 hours in the air revealed an average crystallite size of about 52.833 nm and a high emission intensity with (x, y) CIE color coordinates (0.2705, 0.2741). Therefore, ZnAl2O4: Mn4+ phosphor could be a promising material for the solid-state lighting applications.
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© 2026 The authors. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License.
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