Method for manufacturing BAM blue phosphor for PDP

Abstract

The invention discloses a method for manufacturing BAM blue phosphor for PDP. The method comprises: (1) evenly mixing alumina, barium carbonate, magnesium oxide and europium oxide to obtain a pre-mixture, adding fluxing agent flux to the pre-mixture and mixing the two well to obtain a mixture; (2) putting the mixture into a high-purity alumina crucible, firing the mixture at least once in a reducing atmosphere of nitrogen and hydrogen and obtaining a sintered substance; (3) grinding, sifting, scattering, water-sieving, washing, drying and resifting the sintered substance to obtain a BAM phosphor semi-finished product; and (4) thermally treating the BAM phosphor semi-finished product in a neutral atmosphere or an extremely weak reducing atmosphere, cooling and sifting the obtained product and obtaining a BAM phosphor finished product. The invention provides a method for manufacturing blue phosphor barium-magnesium-europium aluminate for plasma display parts (PDP). On the basis of the prior conventional BAM blue powder, the method adds an atmosphere heat treatment process by optimizing a sintering process and a post-treatment process. The obtained BAM blue powder has the advantages of high luminescent efficiency, good thermal degradation performance, good vacuum ultraviolet degradation resistance and suitability for PDP.

Description

Technical field: [0001] The invention belongs to the field of fluorescent powder manufacturing, and relates to a method for preparing fluorescent powder, in particular to a method for preparing blue fluorescent powder. [0002] The present invention is a phosphor technology for display devices, and specifically refers to a method for preparing phosphors for plasma display screens (PDP). The 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 ph...

AI Technical Summary

Problems solved by technology

[0012] 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

[0016] 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