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Preparation method for high-chroma green phosphor

A green fluorescent powder and manufacturing method technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of reduced fluorescent pink degree and brightness, reduced fluorescent pink degree and brightness, and impure body color, etc., to achieve phosphor powder The effect of pure and full color, improving brightness and chroma, and reducing manufacturing cost

Inactive Publication Date: 2014-08-20
XUZHOU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because bismuth iodide will change from solid to gas at high temperature, when the temperature drops during the discharge process, bismuth will precipitate and adhere to the surface of the phosphor powder, reducing the chromaticity and brightness of the phosphor powder; aluminum nitrate is used as an activator The disadvantage is that the fired phosphor has poor luminescence performance, low brightness and impure body color, and at the same time, trace impurities in the co-solvent will hinder the diffusion of Cu, Al, and Au in the activator in the ZnS lattice, thereby reducing The chromaticity and brightness of the phosphor
In order to meet the requirements of producing green phosphors with a high chroma X value of 0.294 to 0.307, it is necessary to increase the amount of activator chloroauric acid, otherwise the quality of the product cannot be guaranteed, and the increase in the amount of activator Au will lead to the production of phosphors. substantial increase in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Use zinc sulfide as the matrix material and divide it into two parts. The masses of the first part of zinc sulfide and the second part of zinc sulfide are 5g and 4995g respectively;

[0030] (2) Mix 5.675g of copper nitrate, 4.5g of barium iodide, 4.5g of zinc iodide, 4.5g of potassium iodide, 4.5g of strontium bromide and 5g of zinc sulfide to form a mixture, and grind it finely with an agate mortar, and use 120 mesh nylon Sieve through a sieve and set aside;

[0031] (3) Sieve 175g of sulfur with a 45-mesh nylon sieve, mix the mixture obtained in step (2), sulfur and 4995g of zinc sulfide, and then add 1.35g of γ-Al 2 o 3 , poured into the mixer and mixed for 90 minutes, after mixing, it became a phosphor powder firing material;

[0032] (4) Put the phosphor fired material obtained in step (3) into a quartz crucible, shake the quartz crucible lightly and evenly, so that the phosphor fired material is filled and leveled in the quartz crucible;

[0033] (5) Put ...

Embodiment 2

[0036] (1) Use zinc sulfide as the matrix material and divide it into two parts, the masses of the first part of zinc sulfide and the second part of zinc sulfide are 10g and 9990g respectively;

[0037] (2) Mix 22.68g of copper nitrate, 22g of barium iodide, 22g of zinc iodide, 22g of potassium iodide, 22g of strontium bromide and 10g of zinc sulfide to form a mixture, grind it finely with an agate mortar, and sieve it through a 160-mesh nylon screen ,spare;

[0038] (3) Sieve 700g of sulfur with a 45-mesh nylon sieve, mix all the mixture obtained in step (2), sulfur and 9990g of zinc sulfide, and then add 5.65g of γ-Al 2 o 3 , poured into the mixer and mixed for 120 minutes, after mixing, it became a phosphor powder firing material;

[0039] (4) Put the phosphor fired material obtained in step (3) into a quartz crucible, shake the quartz crucible lightly and evenly, so that the phosphor fired material is filled and leveled in the quartz crucible;

[0040] (5) Put 2000g of ...

Embodiment 3

[0043] (1) Use zinc sulfide as the matrix material and divide it into two parts, the masses of the first part of zinc sulfide and the second part of zinc sulfide are 8g and 7992g respectively;

[0044](2) Mix 14.144g of copper nitrate, 12g of barium iodide, 12g of zinc iodide, 12g of potassium iodide, 12g of strontium bromide and 8g of zinc sulfide to form a mixture, grind it finely with an agate mortar, and sieve it through a 140-mesh nylon screen ,spare;

[0045] (3) Sieve 400g of sulfur with a 45-mesh nylon sieve, mix the mixture obtained in step (2), sulfur and 7992g of zinc sulfide, and then add 3.16g of γ-Al 2 o 3 , poured into the mixer and mixed for 100 minutes, after mixing, it became a phosphor powder firing material;

[0046] (4) Put the phosphor powder firing material into the quartz crucible, shake the quartz crucible gently and evenly, so that the phosphor powder firing material is filled and flat in the quartz crucible;

[0047] (5) Put 1040g of sulfur and 10...

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PUM

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Abstract

A preparation method for high-chroma green phosphor is characterized by comprising: dividing zinc sulfide into a first portion and a second portion according to a mass ratio of 0.1:99.9; uniformly mixing copper nitrate, barium iodide, zinc iodide, potassium iodide, strontium bromide and the first portion of zinc sulfide, grinding, sieving, and controlling the Cu usage amount to be 300-700 ppm; mixing the obtained mixture, sulfur and the second zinc sulfide, adding gamma-Al2O3, and mixing to obtain a phosphor sintering material, putting in a quartz crucible, shaking to tamp and flatten the phosphor sintering material; filling a quartz boat with sulfur and active carbon, then putting on the phosphor sintering material, and tightly covering with a quartz cover; under protection of nitrogen atmosphere, putting the quartz crucible in an electrical furnace, and sintering at 950-990 DEG C for 90-180 min; and removing non-luminous or abnormally-luminous powders and foreign matters, so as to obtain the goldless high-chroma green phosphor sintered finished product with the chroma X value of 0.294-0.312.

Description

technical field [0001] The invention belongs to the technical field of cathode ray tube manufacture, and in particular relates to a firing production method of green fluorescent powder firing products. Background technique [0002] In the manufacturing process of green phosphors used in cathode ray tubes of display devices, adding activators Cu and Al to the phosphor ZnS can increase the chromaticity X value of the green phosphor, and the chromaticity X value of the Cu·Al type green phosphor is between 0.279 and 0.293 , which can meet the requirements of green phosphor powder required by general cathode ray tubes. Some cathode ray tubes require high-chromaticity green phosphors, so the activator Au (gold) must be added to make the chromaticity X value reach 0.294-0.307. The quality requirements of the chromaticity green phosphor powder, but this will increase the manufacturing cost of the green phosphor powder, because gold, as a precious metal material, is expensive and oc...

Claims

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Application Information

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IPC IPC(8): C09K11/56
Inventor 梁峙梁骁马捷
Owner XUZHOU UNIV OF TECH
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