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Preparation of goldless green phosphor

A green fluorescent powder and manufacturing method technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of rising phosphor manufacturing cost, impure body color, fluorescent pink degree and brightness reduction, etc., and achieve brightness improvement and reduction Manufacturing cost, pure body color and plump effect

Inactive Publication Date: 2011-05-11
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the bismuth iodide in the co-solvent changes from solid to gas during the high-temperature firing process, but due to the temperature drop during the discharge process, bismuth will precipitate and attach to the surface of the phosphor powder, making the phosphor gray, making the phosphor The chromaticity and brightness of the phosphor are reduced, and because the bismuth iodide and antimony iodide in the co-solvent are relatively high in impurities, it will affect the diffusion of Cu, Al, and Au activators in the ZnS lattice, making the chromaticity of the phosphor and brightness reduction (the more sufficient the diffusion of Cu, Al, Au activators in the ZnS lattice, the higher the chromaticity and brightness of the phosphor
); although the barium iodide co-solvent can reduce the consumption of Au in addition, since there is only one co-solvent, Au must also be added
In addition, because the existing co-activator Al uses aluminum nitrate, the luminescent performance of the phosphor fired product is poor, showing low brightness and impure body color, which increases the amount of co-activator chloroauric acid, resulting in phosphor powder Manufacturing costs have risen sharply
[0003] Overall, there are disadvantages in the existing technology: for large-scale production of green phosphors with a chromaticity X value of 0.293 to 0.305, one is the high cost of green powder manufacturing due to the addition of gold, and the other is the luminous performance of the fired phosphors. Poor, manifested as low brightness and impure body color
These are not conducive to product quality and cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 60 kg of matrix material zinc sulfide, activator copper nitrate reference amount is 0.1134% of the zinc sulfide quality, co-activator γ-Al 2 o 3 The quoted amount is 0.0408% of the mass of zinc sulfide, the quoted amount of cosolvent barium iodide is 0.12% of the mass of zinc sulfide, the quoted amount of zinc iodide is 0.12% of the mass of zinc sulfide, the quoted amount of potassium iodide is 0.12% of the mass of zinc sulfide, bromine The reference amount of strontium chloride is 0.12% of the mass of zinc sulfide, and the reference amount of sulfur is 3.0% of the mass of zinc sulfide. The above materials are weighed according to the requirements of the manufacturing process; copper nitrate, barium iodide, zinc iodide, potassium iodide and strontium bromide respectively and Mix 60g of zinc sulfide with an agate mortar and grind it finely, and sieve it with a 100-mesh nylon sieve, and sieve the sulfur with a 42-mesh nylon sieve; all the sieved materials and the weighed ...

Embodiment 2

[0027] 120 kg of matrix material zinc sulfide, activator copper nitrate reference amount is 0.189% of the zinc sulfide quality, co-activator γ-Al 2 o 3The quoted amount is 0.04265% of the mass of zinc sulfide, the quoted amount of cosolvent barium iodide is 0.16% of the mass of zinc sulfide, the quoted amount of zinc iodide is 0.16% of the mass of zinc sulfide, the quoted amount of potassium iodide is 0.16% of the mass of zinc sulfide, bromine The reference amount of strontium chloride is 0.16% of the mass of zinc sulfide, and the reference amount of sulfur is 5.0% of the mass of zinc sulfide. The above materials are weighed according to the requirements of the manufacturing process; copper nitrate, barium iodide, zinc iodide, potassium iodide and strontium bromide are respectively Mix 90g of zinc sulfide with an agate mortar and grind it finely, and sieve it with a 150-mesh nylon sieve, and sieve the sulfur with a 42-mesh nylon sieve; all the sieved materials and the weighed ...

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PUM

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Abstract

The invention relates to a manufacture method of barren green fluorescent powder. In the method, a latent solvent system consisting of barium iodide, zinc iodide, potassium iodide and strontium bromide is adopted; activated aluminum Gamma-Al2O3 is used as the leading-in matter of a coactivator Al; copper nitrate is used as the leading-in matter of an activator Cu; the led-in Cu is used to replacethe heavy metal gold which belongs to the same main group of the Cu, thus realizing to manufacture the barren green powder the chroma X value of which is between 0.293 and 0.305 and extensively reducing the manufacture cost of the fluorescent powder; besides, the brightness of the fluorescent powder is improved by 2 percent; the color of the fluorescent powder is purer and plumper.

Description

technical field [0001] The invention belongs to the technical field of cathode ray tube manufacture, and relates to a method for manufacturing fluorescent powder for cathode ray tubes, in particular to a method for manufacturing a gold-free green fluorescent powder. Background technique [0002] Green phosphors for cathode ray tubes can be divided into two types of phosphors according to their composition, namely ZnS: Cu·Al type gold-free green powder and ZnS: Cu·Al·Au type gold-containing green powder, according to the current manufacturing method , the former ZnS: Cu·Al formula gold-free green powder has a chromaticity X value of 0.280~0.292, while the latter ZnS: Cu·Al·Au formula gold-containing green powder has a chromaticity X value of 0.293~0.305. Among the green phosphors used in cathode ray tubes, Cu and Al can increase the chromaticity X value of the green powder, but the existing method can only reach 0.292, which can meet the requirements of some cathode ray tubes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
Inventor 李伟苟宝峰
Owner CAIHONG GRP ELECTRONICS CO LTD
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