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An ultraviolet B (UVB) radiation emitting Gd3+ doped SrAl2O4 sample was synthesized by solution combustion. Powder x-ray diffraction, photoluminescence and electron paramagnetic resonance (EPR) techniques were used to characterize the… Click to show full abstract
An ultraviolet B (UVB) radiation emitting Gd3+ doped SrAl2O4 sample was synthesized by solution combustion. Powder x-ray diffraction, photoluminescence and electron paramagnetic resonance (EPR) techniques were used to characterize the as-prepared and annealed samples. The monoclinic phase of SrAl2O4 was identified. It was observed that by employing thermal annealing, the photoluminescence properties of Gd3+ doped SrAl2O4 sample could be considerably improved. The photoluminescence studies disclosed that the sample emits UVB radiation caused by the 6P5/2 → 8S7/2 and 6P7/2 → 8S7/2 transitions of the Gd3+ ions under 273 nm excitation. EPR studies revealed the presence of Gd3+ in the low symmetry Sr2+ sites in as prepared samples, while in annealed samples the intensity of the signal reduced drastically.
Journal Title: Journal of Electronic Materials
Year Published: 2018
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