Gadolinium-doped ZnAl2O4 ultraviolet-emitting powder phosphor was prepared at ∼773 K within a few minutes by the combustion route. A cubic spinel structure of the as-prepared sample was confirmed by the x-ray diffraction method. The morphology and homogeneity of chemical composition of the sample were analyzed using scanning electron microscopy and energy-dispersive x-ray analysis, respectively. Electron paramagnetic resonance (EPR) and photoluminescence studies were performed on the Gd-doped ZnAl2O4 phosphors. The EPR spectrum exhibited signals with effective g values at g = 5.7, 4.4, 3.4, 2.8, 2.3, and 2.0. The signals with effective g values at g = 5.7, 2.8, and 2.0 are attributed to strong, intermediate, and weak cubic crystal fields. The signal at g = 4.4 is attributed to a strong crystal field with orthorhombic symmetry. The signals at g = 3.4 and 2.3 are attributed to the vitreous structure. The emission spectrum exhibits an intense band in the ultraviolet (UV) region centered at 312 nm (32,051 cm−1), being assigned to the 6P7/2 → 8S7/2 transition.
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Acknowledgements
V.S. expresses his thanks to Konkuk University, Seoul (South Korea) for providing an Associate Professorship from the KU Research Professor Program. V.S. also expresses his thanks to Emeritus Professor Dr. Lark Kyo Kim, College of Engineering, Konkuk University, Seoul for his constant encouragement. J.L.R. thanks the University Grants Commission, New Delhi for the award of an Emeritus Fellowship.
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Singh, V., Sivaramaiah, G., Rao, J.L. et al. Electron Paramagnetic Resonance and Photoluminescence Studies of Ultraviolet-Emitting ZnAl2O4:Gd3+ Phosphors. J. Electron. Mater. 44, 121–128 (2015). https://doi.org/10.1007/s11664-014-3414-9
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DOI: https://doi.org/10.1007/s11664-014-3414-9