The Systhesis,Studies And Coatings Of Nanometer Phosphors

Nanometer MgF2 powers were prepared by the chemical precipitation method. The mean diameter of MgF2 was 10-25nm. PDP phosphors particles were prepared by conventional solid reaction and sol-gel methods. The temperature of reaction by sol-gel method was reduced by 300℃. The diameters of the PDP phosphors were mean and were reduced to nanometer, and the strength of the luminescence wasn't reduced. Then, surface modified PDP phosphors with nanometer MgF2 films were prepared by the chemical precipitation method. The best way was that MgCl2 was dropped to the mixture of NH4F and PDP phosphors. During the surface-modified, the depth of the nanometer MgF2 films, the concentration of the reaction. The factors of reaction were discussed in the dissertation. The structure and luminous properties were discussed before and after the surface-modification. The mean diameter of nanometer MgF2 was about 20-100nm. The intensity of excitation and emission were reduced after the surface modified, this may be caused by the compound centers. With the raising of baking temperature, the intensity of luminescence was reduced, this may be caused by the changing concentration quenching of the luminescence. In the dissertation, the hydrolysis method to TiO2 for coating blue PDP phosphors was done, the intensity of luminescence after coating TiO2 nanometer films was reduced more than that of the coating MgF2 nanometer films. So in this dissertation, MgF2 nanometer films were selected to coat. In the same time, nanometer long persistent phosphors SrAl2O4:Eu2+ were prepared by sol-gel method . The crystalline was formed in 700℃, and the crystalline was finished in 800℃. The after green luminescence was observed .The mean diameter of the phosphor was about 20-50nm.The excitation and emission and the long-glow will be discussed.