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Method for manufacturing spherical blue fluorescent substance

A blue phosphorescent, spherical technology, applied in the direction of chemical instruments and methods, luminescent materials, etc.

Inactive Publication Date: 2008-06-25
DAEJOO ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Matsushita's patented process for preparing BAM blue phosphors is not preferred for obtaining BAM with the above-mentioned desired particle characteristics because of the plate-shaped product, because even though round alumina is used as the alumina raw material, they do not use any Flux

Method used

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  • Method for manufacturing spherical blue fluorescent substance
  • Method for manufacturing spherical blue fluorescent substance
  • Method for manufacturing spherical blue fluorescent substance

Examples

Experimental program
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Embodiment 1

[0038] In ethanol, 99.7% by weight containing 2 moles of Al was passed through a ball mill at 250 rpm 2 o 3 , 0.36 mol BaCO 3 , 0.4 mol MgO, 0.04 mol Eu 2 o 3 The raw material mixture with 0.3% by weight of AlF as a flux 3 Mix well for 20 hours. After complete removal of ethanol, the dried mixture was transferred to a 300 cc alumina crucible, sealed, and heat treated at 1500°C for 4 hours under a controlled atmosphere consisting of 96% by volume nitrogen and 4% by volume hydrogen. Such as figure 1 As shown, the resulting phosphor particles are apparently spherical.

Embodiment 2

[0040] In ethanol, 99.7% by weight containing 4 moles of Al was passed through a ball mill at 250 rpm 2 o 3 , 0.36 mol BaCO 3 , 0.4 mol MgO, 0.04 mol Eu 2 o 3 The raw material mixture with 0.3% by weight of AlF as a flux 3 Mix well for 20 hours. After distilling off the ethanol, the dried mixture was transferred to a 300 cc alumina crucible, tightly sealed, and heat treated at 1500°C for 4 hours under a controlled atmosphere consisting of 96% by volume nitrogen and 4% by volume hydrogen. figure 2 (3000x magnification) and image 3 (7000X magnification) shows the shape of the resulting phosphor particles. From figure 2 and image 3 It can be seen that each phosphor particle is spherical and uniform.

reference example 1

[0042] In ethanol, 99.9% by weight containing 2 moles of Al was passed through a ball mill at 250 rpm 2 o 3 , 0.36 mol BaCO 3 , 0.4 mol MgO, 0.04 mol Eu 2 o 3 The raw material mixture with 0.1% by weight of AlF as a flux 3 Mix well for 20 hours. After removal of ethanol, the resulting dried mixture was transferred to a 300 cc alumina crucible, tightly sealed, and heat treated at 1500°C for 4 hours under a reducing atmosphere consisting of 96% by volume nitrogen and 4% by volume hydrogen. Such as Figure 4 As shown, the shape of the phosphor particles is obviously not spherical, but elongated.

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Abstract

The present invention relates to a method for manufacturing spherical and highly crystalline BAM blue phosphor particles, that are close to a single crystal. According to the present invention, the sperical BAM blue particles that are preferable for embodying pictures on a very bright PDP screen can be obtained by mixing raw materials with fluxes to prepare a mixture, transferring the mixture into a closed reactor, and heat-treating the mixture under a reducing atmosphere containing introgen and hydrogen.

Description

Background of the invention [0001] (a) Field of Invention [0002] The present invention relates to spherical BAM blue phosphors (BaMgAl 10 o 17 :Eu 2+ ), more specifically, the present invention relates to a method for preparing spherical BAM blue phosphor particles that can better represent high-brightness images. It is obtained by mixing raw materials with flux, then transferring the mixture into a closed reactor and heat-treating the mixture under a reducing atmosphere consisting of nitrogen and hydrogen. [0003] (b) Description of prior art [0004] One of the main applications of phosphors is in the field of displays, where full color images are achieved using the three primary colors, namely red, green and blue. The three primary colors are produced when fluorescent materials (phosphors) are excited by external energy such as by accelerated electron radiation, ultraviolet radiation, electric field, heating, etc. In general, phosphors can be well used for color di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80C09K11/64C09K11/08C09K11/77
CPCC09K11/7734
Inventor 金钧中姜旼秀权泰贤
Owner DAEJOO ELECTRONICS MATERIALS CO LTD