Abstract
A series of UV-emitting Gd-doped SrAl12O19 phosphors were prepared using a low-temperature solution-combustion method for which urea served as the fuel. These phosphors were characterized using X-ray diffraction (XRD), electron paramagnetic resonance (EPR), and photoluminescence (PL) studies. In phosphors with low dopant concentrations, the EPR spectrum exhibited resonance signals at the effective g factors of 2.41, 2.17, 1.99, 1.88, and 1.66. With the increasing of the concentrations, the resonance signals are evident at the effective g factors of 2.39, 2.18, 1.95, and 1.65. The PL studies of the samples showed a dominant emission peak at 312 nm that corresponds to the 6P7/2 → 8S7/2 transitions of the Gd3+ ions.
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