Preparation method of BAM (BaMgAl10O17) blue fluorescent powder for PDP (plasma display panel)

Abstract

The invention discloses a preparation method of BAM (BaMgAl10O17) blue fluorescent powder for PDP (plasma display panel). The method comprises the following steps: 1) mixing raw materials alumina, barium carbonate, magnesium oxide and europium oxide in a stoichiometric ratio according to Ba0.9MgAl10O17:Eu0.1, and additionally adding a fluxing agent and oxides of W and Mo (or other compounds) in the mixture for fully mixing; 2) putting the mixture finally obtained from the step 1) in a high-purity oxidation crucible, firing for at least once at the reduction atmosphere of nitrogen and hydrogen; 3) smashing the firing substance, then screening, dispersing, screening with a water sieve, washing, drying and screening to obtain the BAM blue fluorescent powder; and 4) carrying out thermal treatment on the BAM blue fluorescent powder at the neutral atmosphere or weak oxidation atmosphere, cooling and then screening to obtain the BAM blue fluorescent powder finished product. The BAM blue fluorescent powder obtained by using the method in the invention has high luminous efficiency, good heat degradation property and good vacuum-resisting ultraviolet degradation property, and is suitable for PDP devices.

Description

Technical field [0001] The invention relates to the field of preparation of phosphors for display devices, in particular to a preparation method of BAM blue phosphors for PDP. [0002] Three primary colors of red, green, and blue phosphors are used in the plasma display screen. The three primary color phosphors and the organic carrier are configured into phosphor paste, which is embedded in the barrier through a certain coating method (screen printing process, spraying process). The plasma display panel is filled with mixed inert gases such as neon (Ne), helium (He), and xenon (Xe). When the gas is ionized under the excitation of a high-frequency electric field, vacuum ultraviolet rays (147nm, 172nm) are generated. The vacuum ultraviolet rays excite the three primary color phosphors to emit light, and use continuous scanning driving devices to image on the plasma display screen. Background technique [0003] At present, the blue phosphor of commercial plasma display panel (PDP) i...

AI Technical Summary

Problems solved by technology

[0011] Chinese patent CN1697871A proposes that the BAM phosphor fired under reducing atmosphere conditions should be pulverized, washed with water, dried, etc., and then heat treated in an ozone atmosphere, so that the oxygen defects of the BAM matrix can be repaired, and the BAM phosphor The luminescent particle size does not decrease, but the patent does not consider the change of chromaticity during the application of BAM blue powder

[0015] Chinese patent CN1618927A proposes that by heat-treating BAM phosphor powder under inert gas conditions, the divalent europium ratio of the BAM phosphor particle is lower than that of the entire particle on the particle surface and its vicinity, and the phosphor has higher luminescence Efficiency maintenance rate, but compared with before treatment, the phosphor luminous efficiency is greatly reduced

Images