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Abstract
Energy efficient white light emitting single phase materials are yielding a widespread interest in the research field. Improving their quality and efficiency had become the main motive. In this work CaZr0.9SmxDy(0.1-x)O3 compound with x = 0.025, 0.05 and 0.075 codoped with 1% mol and 10% mol of Mg2+ and Al3+ ions were prepared by solid state route and corresponding changes in the luminescence properties were studied. Orthorhombic (Pnma) perovskitestructure of the samples was confirmed from the x-ray diffraction spectra. The band gap of the Mg2+ and Al3+codoped samples shows a decrease from the corresponding CaZr0.9SmxDy(0.1-x)O3 due to the additional energy levels created near valence and conduction bands in the parent samples. Photoluminescence studies of Mg2+ and Al3+ co doped samples show enhancement in the emission peaks corresponding to excitation at 354 nm. The peaks at 484 nm and 575 nm due to the transition between 4F9/2-6H15/2 and 4F9/2-6H13/2 levels of Dy3+ ions observed in CaZr0.9SmxDy(0.1-x)O3 compound had been increased considerably which was absent for the peaks corresponding to Sm3+ ions indicates that the effective charge transfer due to aluminiumco doping and local distortion due to magnesium co doping was centred around Dy3+ ions. The chromaticity diagrams of corresponding samples were also studied.
Published Version
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