Abstract
La1−xP3O9:xTb3+ (x = 0.005 ≤x ≤ 0.11) phosphors were prepared via the co-precipitation method. The crystal phase was analyzed by X-ray diffraction and the various functional groups in the host were investigated using Fourier transform infra-red (FT-IR) spectroscopy. The luminescence properties of the Tb3+ ions were studied using photoluminescence (PL) excitation and emission spectra. The PL analyses under ultraviolet (UV) and vacuum ultraviolet (VUV) excitation both gave almost similar results. The green emission was observed at 546 nm, corresponding to the transition 5D4→7F5 under 251, 147 and 172 nm excitation. The optimum concentration was 0.09 mol. The calculated CIE coordinates were shifted towards the intense green region from the pale white region with increasing Tb3+ ion concentration. The obtained results demonstrated the potential for LaP3O9 as a candidate in lighting and plasma display panel (PDP) applications.
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