Borate red fluorescent powder for colored plasma panel display and manufacturing method thereof

Abstract

The invention relates to borate red fluorescent powder and manufacturing method thereof. The chemical formula of the borate red fluorescent powder is (Y1-x-y-zGdzMyEux)BO3, wherein x is not less than 0.01 and not more than 0.20, y is not less than 0 and not more than 0.02, z is more than 0.1 and less than 1 and the relationship of 1-x-y-z>0 is satisfied; and M is one or more of La, Tb and Sm. The manufacturing method comprises the following steps of: firstly, generating a rare earth oxide mixture (including yttrium oxide, gadolinium oxide, europium oxide, lanthanum oxide, samarium oxide and terbium oxide) by adopting a coprecipitation method; then adding a proper amount of a fluxing agent and boric acid with stoichiometry; after fully and evenly mixing, roasting in a high-temperature furnace for 1-5 hours; scrunching, wetting and sieving a roasting product; wet milling an oversize product and then wetting and sieving to obtain slurry; and washing the slurry with hot water, filtering and drying to obtain the borate red fluorescent powder. The borate red fluorescent powder has simple manufacturing method, low cost and high relative brightness and favorable color purity under the excitation of vacuum ultraviolet rays.

Description

technical field [0001] The invention relates to a luminescent material excited by vacuum ultraviolet rays and a manufacturing method thereof, in particular to a red component in a three-primary-color phosphor used in a color plasma flat panel display (PDP). Background technique [0002] Color plasma flat panel display (PDP) is to coat red, blue, and green phosphor powder in a discharge plate filled with a mixed inert gas such as Xe or Xe-Ne, and use the vacuum ultraviolet rays generated during gas discharge to excite the phosphor powder. To achieve the purpose of displaying images, phosphor powder is one of the key materials affecting the performance of color plasma flat panel display (PDP). Red phosphor powders for color plasma flat panel display (PDP) mainly include yttrium europium oxide, yttrium europium vanadate, yttrium europium vanadium phosphate, yttrium gadolinium europium borate, etc. Under 254nm excitation, the luminous intensity of yttrium europium oxide, yttriu...

AI Technical Summary

Problems solved by technology

However, the sol-gel method is more complicated to operate, the process is longer, the production cost is higher, and the production efficiency is low.

Therefore, the sol-gel method is not very practical in the production of red borate phosphors, and the brightness of the obtained phosphors is not high.

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