Combustion Synthesis And Spectrum Characteristic Of Nanocrystalline BaMgAl₁₀O₁₇:Eu～(2+) Blue Phosphor For PDP

BaMgAl10O17:Eu2+ (BAM) has been widely used in plasma display panels (PDP) due to its merits such as good chromaticity, high quantum efficiency and luminescence efficiency under the excitation of vacuum ultraviolet (VUV) light.The BAM have been mainly prepared by high temperature solid-state reaction process, the obtained phosphor contains irregularly shaped and aggregated particles (5~20μm). Therefore, a milling process for long time is required, but the process creates surface and crystal defects which reduce the brightness of the phosphor. Therefore, the development of new processes for preparing BAM has important significance,not only lowering production costs but also improving its luminous efficiency.Recently, as a novel technology for the prepareation of oxidate powders with superfine or nanometer size, the solution combustion method has been gotten considerable attentions. In this paper, the technology was applied to prepare Eu2+ actived BAM blue phosphor. Phase structure, morphology and spectrum characteristic of the phosphor synthesized under different processing parameters were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and spectrophotofluorometer.The results indicate that the particle morphology, grain size, luminescent property and crystal structure of BAM phosphor is considerably influenced by processing parameters. When mol tatio of urea and metal nitrate is 2.0, the sample is BAM single phase with 600℃furnace temperature and its average grain size is about 45nm. The intensity of the fluorescence of BAM was increased obviously with increasing the Eu2+ doping concentration, and the optimum emission intensity was reached at x=0.2 . In addition, the content of H3BO3 is about 1.0%, which increased the relative emission intensity of the phosphor over 30%.Moreover, added PEG to improve BAM particle size and shape, when the content of PEG is 5.0%, the particles have nearly spherical shape, homogeneous and small size (30nm).