Luminescence Properties of Rare Earth and Transition Metal Doped Nano Magnesium Oxide

Abstract

Activity all over the world has focused on the exploration of new synthetic routes to newlineinorganic materials with improved properties. Chemical routes where homogeneity is newlinerealized to an atomic scale, could give fine particles with uniform size distribution and newlinelarge surface area. Recently new techniques such as low temperature initiated, self newlinepropagating, gas producing combustion process, hydrothermal process and sol-gel newlineprocess are developed for the synthesis of oxide materials. Synthesis of oxides newlinenanoparticles is one of the major challenges in the development of advanced newlinetechnologically important materials. By conventional solid state route, it is not newlinepossible to obtain a nano-sized powder because due to the initial sizes of the reactants newlinethey are very much larger. A major challenge encountered in the synthesis of newlinenanocrystalline multicomponent oxides is the poor control of stoichiometry at the newlinenano level. Although the solid state reaction is a simple process, this technique suffers newlinefrom major draw backs like the weak reactivity of the starting materials and poor newlinehomogeneity of the product. newline newlineNano-sized particles can be densified at much lower temperature as compared newlineto large grained powders because of its high surface energy and driving force and the newlinefinal product will exhibit unique mechanical, optical, magnetic and electrical newlineproperties. Nanophosphors are being extensively investigated in last few years due to newlinepotential applications in various types of displays such as plasma display panels, field newlineemission displays. Conventional phosphors used in fluorescent lamps are not ideal for newlinesolid state lighting because they have poor absorption for the light emitting diodes newline(LED). Quantum dots exhibit narrow absorption and emission with a small Stoke newlineshift. This behavior makes them useful in light management like up conversion and newlinedown conversion. newline