Size-controlled nanophosphors prepared by gas-phase flame synthesis with vapor precursors

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Rare earth doped nanophosphors were prepared by a gas-phase flame synthesis method, in which some vapors or liquid sprays were used as precursors. The prepared nanophosphors were examined by TEM, SEM, XRD, and fluorescence spectroscopy. The size of nanophosphors prepared with vapor precursors depended on partial pressure of vapor precursor, flame temperature and combustible gas pressure. On the other hand, the photoluminescence characteristics of those phosphors only depend on flame temperature, which influenced on the crystalline structure. As for flame synthesis with liquid spray precursors, the size was controlled by spray droplet size and concentration.