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Method for manufacturing borate green phosphor

A green phosphor, manufacturing method technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of uneven distribution of activator Tb concentration, surface damage of crystal morphology, large particle size of phosphor powder, etc., and achieve crystal morphology Complete, small powder center particle size, high luminous brightness

Inactive Publication Date: 2012-09-05
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Red, green and blue three primary color phosphors are used in the plasma display, and the three primary color phosphors and the organic carrier are configured into a phosphor slurry, which is embedded in the barrier by a certain coating method, and filled in the plasma display. There are mixed inert gases such as neon (Ne), helium (He), xenon (Xe), etc. When the gas is ionized under the excitation of a high-frequency electric field, vacuum ultraviolet rays are generated, and the vacuum ultraviolet rays excite trichromatic phosphors to emit light. The scanning drive device is used for imaging on plasma display screens. In addition, the phosphor powder can also be used to excite mercury-free fluorescent lamps in vacuum ultraviolet rays. At present, borate green powder is widely used in color plasma display devices, and its chemical composition formula is (Y , Gd)BO 3 :Tb, and with BaMgAl 10 o 17 :Eu blue powder and (Y, Gd)BO 3 : Combined use of Eu red powder, previously prepared (Y, Gd)BO 3 : The method of Tb green powder is mainly to mix Y 2 o 3 , Gd 2 o 3 , Tb 4 o 7 Mixing, and then mixed with boric acid, high-temperature solid-state reaction, the fluorescent powder obtained by this method cannot be mixed sufficiently between the materials, and the concentration of the activator Tb is unevenly distributed, resulting in low brightness of the powder and large particle size of the obtained phosphor , need to go through ball milling dispersion treatment, so that the surface of the crystal morphology is damaged, and the brightness will be adversely affected again after dispersion. The rare earth oxide co-precipitation body is mixed with boric acid and then the high-temperature solid-state reaction process is carried out. The brightness of the phosphor powder obtained by this method is It must be improved, but due to the high synthesis temperature, the particle size of the obtained phosphor is too large, and dispersion treatment is required. The yttrium-gadolinium-terbium borate green powder is prepared by the sol-gel method, and the obtained precursor is roasted at a low temperature of 800-900°C to obtain Rare earth borate phosphor, but the sol-gel method is more complicated to operate, the process is longer, the production cost is high, the efficiency is low, and the brightness of the obtained phosphor is not high, so it is not practical in actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] A kind of manufacture method of borate green fluorescent powder, comprises the following steps:

[0013] The first step, according to the chemical formula (Y 1-x-y-z Gd x m y Tb z )BO 3 Ratio of material components Weigh required rare earth metal oxides yttrium oxide, gadolinium oxide, terbium oxide and M, wherein x=0.3; y=0; z=0.1, dissolve in excess hydrochloric acid with a weight ratio of 20%, forming a rare earth metal salt solution; then heating the rare earth metal salt solution to 85° C. while stirring, and slowly adding an excess weight ratio of 30% oxalic acid solution into the rare earth metal salt solution to obtain a rare earth metal oxalate precipitate; After the obtained precipitate was fully washed with deionized water to pH = 7, the precipitate was dehydrated, dried at 110°C and passed through a 100-mesh dry sieve, then loaded into an alumina crucible and decomposed at a high temperature in an oxidation furnace at a temperature of 700°C, after 1.5 h...

example 2

[0018] A kind of manufacture method of borate green fluorescent powder, comprises the following steps:

[0019] The first step, according to the chemical formula (Y 1-x-y-z Gd x m y Tb z )BO 3 The proportion of material components weighs the required rare earth metal oxide yttrium oxide, gadolinium oxide, terbium oxide and M, wherein x=0.4; y=0.01, z=0.1, and its M is aluminum oxide, and the weight ratio of dissolving in excess is In 25% nitric acid, a rare earth metal salt solution is formed; then, while stirring, the rare earth metal salt solution is heated to 80°C, and an excessive amount of oxalic acid solution with a weight ratio of 35% is slowly added to the rare earth metal salt solution to obtain a rare earth metal salt acid salt precipitate; then the obtained precipitate was fully washed with deionized water to pH = 7, then the precipitate was dehydrated, dried at 120°C, passed through a 100-mesh dry sieve, and then loaded into an alumina crucible in an oxidation ...

example 3

[0024] A kind of manufacture method of borate green fluorescent powder, comprises the following steps:

[0025] The first step, according to the chemical formula (Y 1-x-y-z Gd x m y Tb z )BO 3 The proportion of material components weighs the required rare earth metal oxide yttrium oxide, gadolinium oxide, terbium oxide and M, wherein x=0.2; y=0.01; z=0.12, wherein M is aluminum oxide, and the weight ratio of dissolving in excess is In 30% hydrochloric acid, a rare earth metal salt solution is formed; then, while stirring, the rare earth metal salt solution is heated to 90° C., and an excess weight ratio of 25% oxalic acid solution is slowly added to the rare earth metal salt solution to obtain a rare earth metal oxalic acid Salt precipitate; then the obtained precipitate is fully washed with deionized water to pH = 7, then the precipitate is dehydrated, dried at 110°C and passed through a 100-mesh dry sieve, and then loaded into an alumina crucible in an oxidation furnace ...

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Abstract

The invention provides a method for manufacturing borate green emitting phosphor. The method comprises the following steps: firstly, weighing a required rare-earth metallic oxide in the substance composition proportion of a chemical formula (Y1-x-y-zGdxMyTbz)BO3, and dissolving the rare-earth metallic oxide in acid to form a rare-earth metallic salt solution; secondly, preparing a rare-earth metallic oxalate precipitate; thirdly, processing the precipitate to obtain a rare-earth oxide co-precipitate, preparing a mixture of the rare-earth oxide and boric acid, and filling the mixture of the rare-earth oxide and the boric acid in an alumina crucible to calcine a yttrium-gadolinium-terbium borate green emitting phosphor calcined substance; and finally, pouring the yttrium-gadolinium-terbium borate green emitting phosphor calcined substance into a heatable container to prepare slurry, washing the slurry with hot water, dehydrating and drying the slurry, filtering the slurry through a nylon screen to obtain the borate green emitting phosphor. The method ensures that the boric acid and the rare-earth oxide are mixed more evenly, and the prepared phosphor has high brightness, good color purity, complete crystal form and small central granularity of powder without sphere dispersion.

Description

technical field [0001] The invention relates to the field of phosphor manufacturing, in particular to a method for manufacturing borate green phosphor. Background technique [0002] Red, green and blue three primary color phosphors are used in the plasma display, and the three primary color phosphors and the organic carrier are configured into a phosphor slurry, which is embedded in the barrier by a certain coating method, and filled in the plasma display. There are mixed inert gases such as neon (Ne), helium (He), xenon (Xe), etc. When the gas is ionized under the excitation of a high-frequency electric field, vacuum ultraviolet rays are generated, and the vacuum ultraviolet rays excite trichromatic phosphors to emit light. The scanning drive device is used for imaging on plasma display screens. In addition, the phosphor powder can also be used to excite mercury-free fluorescent lamps in vacuum ultraviolet rays. At present, borate green powder is widely used in color plasma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 席增卫李永强张延民王伍宝黄毅群孙云飞
Owner CAIHONG GRP ELECTRONICS CO LTD