Abstract
This chapter discusses the synthesis and characterization of the europium doped oxide based phosphors SrGd2O4 and BaGd2O4. These hosts have hardly been investigated in detail, but are ideally suited for the incorporation of rare earth luminescent ions. A homogenous precipitation method followed by combustion process was adopted to synthesize these phosphors for large scale production. The structural and morphological studies of the prepared phosphors were performed by using X-ray diffraction analysis and field emission scanning electron microscopy techniques. The photoluminescence (PL) studies reveal the characteristics emission of Eu3+ ions due to the 5D0→7FJ (J=0, 1, 2, 3, 4) transitions. The energy transfer mechanism responsible for intense red light yield in the prepared phosphors has been explained at length. The detailed investigation of luminescence behavior and site symmetry of Eu3+ ions in SrGd2O4 and BaGd2O4 host has been studied by determining the Judd-Ofelt intensity parameters Ωλ (λ = 2, 4, 6). To determine the thermal stability of the synthesized phosphors, the temperature dependent photoluminescence measurements have been carried out. High thermal stability, high colour purity and intense red emission indicate the suitability of these Eu3+ doped oxide based phosphors as promising candidates for lighting and display devices.
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