Aluminate phosphor, method for producing same, and light-emitting element

A manufacturing method and aluminate technology, applied in electrical components, luminescent materials, electrical solid devices, etc., can solve problems such as low quantum yield and luminous intensity of phosphors, and achieve the effect of high luminous intensity

Inactive Publication Date: 2011-11-30
NIPPON CHECMICAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in most cases, the strontium aluminate phosphor is obtained by mixing various raw materials in a dry or wet manner,

Method used

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  • Aluminate phosphor, method for producing same, and light-emitting element
  • Aluminate phosphor, method for producing same, and light-emitting element
  • Aluminate phosphor, method for producing same, and light-emitting element

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0075] [Example 1]

[0076] (1) Homogeneous slurry preparation process;

[0077] Sr:Al:Eu molar ratio is 0.9:2.12:0.1, that is (Sr+Eu) / Al=0.47, Eu / (Sr+Eu)=0.1, weigh strontium carbonate (average particle size 0.83μm), alumina (γ-alumina; average particle size 11.8μm, specific surface area 150m 2 / g) and europium oxide (average particle size 3.66μm), put into a ball mill. Water and a dispersant (manufactured by Kao Co., Ltd., Poise 2100) were added to a ball mill to prepare a mixed solution with a solid content concentration of 25%. The concentration of the dispersant is 4%.

[0078] A zirconia ball with a diameter of 1.0 mm was added to a ball mill, and mixed and crushed by a 15-hour wet method. The average particle diameter of the solid content of the slurry after mixing and pulverization was measured by a light scattering method, and it was 0.12 μm.

[0079] (2) Spray drying process (drying process);

[0080] Next, in a spray dryer whose inlet temperature was set to 200°C, the mix...

Example Embodiment

[0086] [Example 2]

[0087] In the (1) uniformly mixed slurry preparation process of Example 1, except that the charge molar ratio is set to (Sr+Eu) / Al=0.5, Eu / (Sr+Eu)=0.05, the rest is the same as in Example 1. With the same operation, aluminate phosphor (SrAl 2 O 4 :Eu). X-ray diffraction measurement was performed on the obtained aluminate phosphor. As a result, it was confirmed that strontium aluminate with a tridymite structure was obtained.

Example Embodiment

[0088] [Example 3]

[0089] In the (1) uniformly mixed slurry preparation process of Example 1, except for setting the charge molar ratio to (Sr+Eu) / Al=0.45 and Eu / (Sr+Eu)=0.05, the rest is the same as in Example 1. With the same operation, aluminate phosphor (SrAl 2 O 4 :Eu). X-ray diffraction measurement was performed on the obtained aluminate phosphor. As a result, it was confirmed that strontium aluminate with a tridymite structure was obtained.

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Abstract

The invention provides an aluminate phosphor with high luminous intensity. Aluminate phosphors are characterized in that they are composed of strontium aluminate containing an activating element, a plurality of primary particles are aggregated into a spherical shape, and no gaps between the primary particles are observed on the surface when observed with an electron microscope at a magnification of 3000 times. Grain composition of surface states at grain boundaries. The aluminate phosphor is suitably manufactured as follows: prepare a mixed slurry obtained by mixing an activated element source, a strontium source, an aluminum source, and a dispersion medium, wet-mix the raw material mixed slurry through a media mill, and use a spray drying method The obtained homogeneously mixed slurry is formed into a dry powder, and the dry powder is fired once at 1000° C. or higher to obtain a primary fired body, and then the primary fired body is subjected to secondary firing.

Description

technical field [0001] The invention relates to an aluminate phosphor with strontium aluminate as a parent crystal and a manufacturing method thereof. In addition, the present invention also relates to a light-emitting device using the phosphor. Background technique [0002] In recent years, blue diodes have been put into practical use, and white light-emitting diodes using this diode as a light-emitting source are known. Light-emitting diodes (LEDs) have the advantages of being lightweight, using no mercury, and having a long life. [0003] For example, it is known that Y 3 Al 5 o 12 : Ce white LED. However, this LED isn't strictly white, it's white mixed with blue-green. Therefore, the mixed Y 3 Al 5 o 12 :A method of adjusting the color tone of Ce and a red phosphor that absorbs blue light and emits red fluorescence, a method of adjusting the color tone by combining a near-ultraviolet LED and three types of red, green, and blue phosphors, and a method of combinin...

Claims

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Application Information

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IPC IPC(8): C09K11/64H01L33/50
CPCH01L33/0095H01L33/501H01L2924/12041H01L2933/0041
Inventor 柳原淳良仲冈泰裕
Owner NIPPON CHECMICAL IND CO LTD
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