Authors: X. Qin, Y. Ju, S. Bernhard and N. Yao
Affilation: Princeton University, United States
Pages: 318 - 321
Keywords: Yttrium silicate, nanophosphors, flame synthesis, photoluminescence
Europium doped yttrium silicate nanophosphors were successfully synthesized for the first time by using the flame spray pyrolysis method at different silicon and europium concentrations. The effect of silicon concentration on the crystal structure, morphology, and photoluminescence intensity of the nanophosphors were investigated. The as-prepared nanophosphors exhibit good red luminescence with spherical morphology and narrow size distribution, and the crystal structure and photoluminescence intensity were strongly affected by the ratio of silicon to yttrium in the precursor solution. Depending on the silicon (TEOS) concentration, the experiment demonstrated that there existed three different crystal phases: an incomplete phase at low TEOS concentrations, a pure phase at intermediate TEOS concentrations, and an amorphous structure dominated phase at high TEOS concentrations. The silicon and europium concentration has little effect on the particle morphology and size, which is mainly controlled by the overall concentration of the starting precursor solution. The as-prepared nanophosphors have good red luminescence with spherical morphology, narrow size distribution. The optimum photoluminescence intensities exist depending on the ratio of silicon to yttrium and europium doping concentration. The nanophosphors prepared by the flame pyrolysis method could find potential application in lamps, high resolution displays and other industries.
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