Abstract
The polycrystalline BaGd<sub>2-x</sub>O<sub>4</sub>: Tb<sub>x</sub> (x = 0.00 - 0.10) phosphors have been prepared by conventional high temperature solid state reaction method. All the prepared samples were characterized by powder XRD and EDS techniques. The photoluminescence (PL) and thermally stimulated luminescence (TSL) studies of these materials were investigated. For PL studies the samples were excited with 263 nm UV light. All the samples showed strong green emission at 543 nm due to <sup>5</sup>D<sub>4</sub>→<sup>7</sup>F<sub>5</sub> transition of Tb<sup>3+</sup> ions. PL peak intensity was found to increase with increasing dopant concentration. For TSL studies, these samples were γ-irradiated with different dose rates using <sup>60</sup>Co source. TSL of these phosphors showed a sharp glow peak with peak maxima at 394 K. It is found that the incorporation of terbium activator in BaGd<sub>2</sub>O<sub>4</sub> host lattice resulted in the increase of TSL intensity. The luminescence results of these materials shows that these are promising candidates for new green emission phosphor.
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