Method for preparing nano structural spherical fluorescent powder

A nanostructure and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of phosphor crystal grain size, luminous brightness attenuation, crystallization destruction, etc., achieve narrow particle size distribution, prevent high temperature agglomeration, and crystallization high quality effect

Inactive Publication Date: 2011-04-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing problem is that the crystal grains of the phosphor prepared by this process are coarse, and must be crushed

Method used

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  • Method for preparing nano structural spherical fluorescent powder
  • Method for preparing nano structural spherical fluorescent powder

Examples

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Example Embodiment

[0025] Example 1

[0026] (1) According to the chemical formula Y 2.94 Al 5 O 12 :Ce 0.06 The stoichiometric relationship in the raw material powder Al was weighed 2 O 3 , Y 2 O 3 and CeO 2 , put it into the ball mill tank of the ball mill, add polyvinyl alcohol binder, polyvinyl amide dispersant, n-butanol defoamer and distilled water, adjust the speed of the ball mill to 120 rpm, and disperse the ball for 4 hours to obtain a slurry ; Among them, the total amount of oxide powder in the slurry is 70wt%, the polyvinyl alcohol binder is 1wt%, the polyvinyl amide dispersant is 0.3wt%, the n-butanol defoamer is 1wt%, and the balance is distilled water ;

[0027] (2) adopt spray drier to carry out spray granulation, cross 200 mesh sieves, and collect granulated powder under the sieve;

[0028] (3) the granulated powder obtained in step (2) is fed into the acetylene-oxygen flame at a rate of 20 g / min by a powder feeder, wherein the acetylene flow is 20 liters / min, and the ...

Example Embodiment

[0031] Example 2

[0032] (1) According to the chemical formula Lu 0.99 AlO 3 :Ce 0.01 Weigh the raw powder Lu 2 O 3 , Al 2 O 3 and CeO 2 , put it into the ball mill tank of the ball mill, add polyvinyl alcohol binder, polyvinyl amide dispersant, n-butanol defoamer and distilled water, adjust the speed of the ball mill to 120 rpm, and disperse the ball for 8 hours to obtain a slurry ; Among them, the total amount of oxide powder in the slurry is 40wt%, the polyvinyl alcohol binder is 1.5wt%, the polyvinylamide dispersant is 0.2wt%, the n-butanol defoamer is 1.5wt%, and the balance is distilled water;

[0033] (2) adopt spray drier to carry out spray granulation, cross 200 mesh sieves, and collect granulated powder under the sieve;

[0034] (3) the granulated powder obtained in step (2) is fed into the acetylene-oxygen flame at a rate of 10 g / min by a powder feeder, wherein the acetylene flow is 20 liters / min, and the oxygen flow is 15 liters / min; The granular powder ...

Example Embodiment

[0037] Example 3

[0038] (1) According to the chemical formula Gd 2.94 Sc 2 Al 3 O 12 :Ce 0.06 The stoichiometric relationship in the raw material powder Gd is weighed 2 O 3 , Sc 2 O 3 , Al 2 O 3 and CeO 2 , put it into the ball mill tank of the ball mill, add polyethylene oxide binder, polyvinylamide dispersant, n-butanol defoamer and distilled water, adjust the speed of the ball mill to 120 rpm, and disperse the ball for 12 hours to obtain Slurry; wherein, the total amount of oxide powder in the slurry is 50wt%, the polyvinyl alcohol binder is 1wt%, the polyvinylamide dispersant is 0.2wt%, the n-butanol defoamer is 2wt%, and the balance is distilled water;

[0039] (2) adopt spray drier to carry out spray granulation, cross 200 mesh sieves, and collect granulated powder under the sieve;

[0040] (3) the granulated powder obtained in step (2) is fed into the acetylene-oxygen flame at a rate of 10 g / min by a powder feeder, wherein the acetylene flow is 20 liters / mi...

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Abstract

The invention belongs to the technical field of luminous materials, and particularly relates to a method for preparing nano structural spherical fluorescent powder. The chemical formula composition of the fluorescent powder is Aa-xMbOc: Rex, wherein A is one or more of Sc, Y, La, Gd, Yb, Lu, Mg, Ca, Sr, Ba and Zn; M is Al or Si; Re is Ce or Eu; and a is more than or equal to 1 and less than or equal to 5, b is more than or equal to 1 and less than 20, and x is more than 0 and less than or equal to 0.06. The method comprises the following steps of: 1) preparing slurry by using oxides of A, M and Re as raw materials, and performing spray granulation; 2) heating granulation powder in flow regime by using acetylene-oxygen flame, and forming amorphous spherical powder by water quenching; and 3) in reduction atmosphere, crystallizing the amorphous spherical powder to obtain the nano structural crystal spherical fluorescent powder. The fluorescent powder does not need ball milling, and has spherical micro appearance, excellent luminous performance and important industrial application value.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and particularly relates to a preparation method of yttrium aluminum garnet (YAG) spherical fluorescent powder for LED and other rare earth oxide spherical fluorescent powder. Background technique [0002] In today's global energy shortage, new green lighting sources represented by LED are receiving more and more attention. As an important supporting material, the high luminous intensity, good microscopic morphology and suitable particle size of phosphors can effectively improve the performance of LED devices. Commonly used phosphors are aluminate matrix, silicate matrix and nitride matrix. In recent years, with the improvement of phosphor quality and packaging process, the white light output power of yttrium aluminum garnet phosphor (YAG:Ce) combined with LED blue light chip has increased to 161lm / w, making LED light source truly enter the lighting field. . [0003] At present, ...

Claims

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Application Information

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IPC IPC(8): C09K11/80C09K11/64C09K11/59C09K11/79
Inventor 李江涛梅林王丽丽贺刚刘光华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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