Synthesis and characterization of novel luminescent materials: typical oxide phosphors and possible inert host lattices

The discovery of new materials and subsequent optimization of their synthesis and envisage a prospect of their properties remains an important step in developing technologies. Multicomponent metal oxides exhibit a variety of outstanding physical and chemical properties, which include electric, magnetic, optical, mechanical, catalytic, and many other different functionalities. Luminescence is a subject that continues to play a major technological role for humankind. Garnets mainly are used as phosphor materials employed in solid state lasers or light-emitting diodes. Another very efficient phosphor matrix is merwinite structure. Thus, this PhD work has aimed to synthesize mixed-metal gallium garnets by sol-gel combustion method to meet the requirement of phosphor emitting light in far-red region and to investigate the preparation conditions for the first time for mixed barium copper silicate as inert matrix for light technologies. The sol-gel chemistry approach was developed to the mixed-metal gallium garnets. The novel compositions of M3A2Ga3O12 (M = Gd3+, Y3+, Lu3+; A = Sc3+, Ga3+) were successfully fabricated using the sol-gel combustion processing. Moreover, these garnets were doped with Fe3+, Ce3+, Ce3+/Cr3+ and Cr3+ to develop new phosphors. The attempts to synthesize mixed-metal silicates Ca3Mg(SiO4)2 and new Ba3Cu(SiO4)2 using this economical and environmentally friendly synthesis processing were also done