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Coprecipitation-rheological phase preparation method of rare earth-doped yttrium aluminum garnet fluorescent powder

A technology of yttrium aluminum garnet and rare earth doping, applied in chemical instruments and methods, luminescent materials, electrical components and other directions, can solve the problem of not being able to improve light decay, brightness and coating performance at the same time, large particle size of solid-phase method products, and raw materials. The problem of high cost is to achieve the effect of regular shape, good luminous performance and uniform particle size

Inactive Publication Date: 2012-07-18
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

The solid-phase method has large particle size and poor uniformity; the raw material cost is high and the yield is low in the sol-gel method preparation process; other methods also have the following defects: the light decay, brightness and coating performance cannot be improved at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare the molecule as Y 3 Al 5 o 12 : The rare earth doped yttrium aluminum garnet fluorescent powder of Ce, its preparation steps are as follows:

[0029] Weigh 3.331gY 2 o 3 (4N) and 0.086gCeO 2 (4N) is added in water, and it is heated and dissolved with the concentrated nitric acid of 1ml: 1ml with the volume ratio, is mixed with the yttrium cerium nitrate mixed solution that the pH of 0.08mol / l is 6; Add 18.756gAl ( NO 3 ) 3 9H 2 O, make metal ion mixed solution (mother salt solution);

[0030] Weigh 6.320g NH 4 HCO 3 , prepared into a precipitant solution with a concentration of 1.5mol / l;

[0031] At room temperature, the mother salt solution was added dropwise (drop rate 5ml / min) to the stirred NH 4 HCO 3 solution until all precipitates are formed; then wash the precipitates with deionized water and absolute ethanol in turn; obtain a white precipitate precursor, and dry the white precipitate precursor;

[0032] Mix 0.060g of 0.6um YAG seed crystal ...

Embodiment 2

[0056] Prepare the molecule as Y 3 Al 5 o 12 : The rare earth doped yttrium aluminum garnet fluorescent powder of Ce, its preparation is as follows:

[0057] Weigh 3.331gY 2 o 3 (5N) and 0.086gCeO 2 (5N) is added in water, and it is heated and dissolved with the concentrated nitric acid of 1ml: 1ml with the volume ratio, is mixed with the yttrium cerium nitrate mixed solution that the pH of 0.02mol / l is 7; Add 18.756gAl ( NO 3 ) 3 9H 2 O, make metal ion mixed solution (mother salt solution);

[0058] Weigh 6.320g NH 4 HCO 3 , prepared into a precipitant solution with a concentration of 1.0mol / l;

[0059] At room temperature, the mother salt solution was added dropwise (drop rate 1ml / min) to the stirred NH 4 HCO 3 solution until all precipitates are formed; then wash the precipitates with deionized water and absolute ethanol in turn; obtain a white precipitate precursor, and dry the white precipitate precursor;

[0060] Add 0.30g of 0.05um SiC seed crystal and 0.0...

Embodiment 3

[0065] Prepare the molecule as Y 3 Al 5 o 12 : The rare earth doped yttrium aluminum garnet fluorescent powder of Ce, its preparation is as follows:

[0066] Weigh 3.331gY 2 o 3 (6N) and 0.086gCeO 2 (6N) is added in water, and it is heated and dissolved with the concentrated nitric acid of 1ml: 1ml with the volume ratio, is mixed with the yttrium cerium nitrate mixed solution that the pH of 0.15mol / l is 6; Add 18.756gAl ( NO 3 ) 3 9H 2 O, make metal ion mixed solution (mother salt solution);

[0067] Weigh 6.320g NH 4 HCO 3 , prepared into a precipitant solution with a concentration of 3.0mol / l;

[0068] At room temperature, the mother salt solution was added dropwise (drop rate 10ml / min) to the stirred NH 4 HCO 3 solution until all precipitates are formed; then wash the precipitates with deionized water and absolute ethanol in turn; obtain a white precipitate precursor, and dry the white precipitate precursor;

[0069] 0.1um SiO 2 Add 0.006g of seed crystal and...

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Abstract

The invention relates to a coprecipitation-rheological phase preparation method of rare earth-doped yttrium aluminum garnet fluorescent powder, which comprises the following steps of: preparing a precursor, taking nanometer / micrometer YAG, SiO2 or SiC as a seed crystal and adjusting the seed crystal, the precursor and a dispersing agent into a rheological phase; then washing and removing impurities in the fluorescent powder through high-temperature heat treatment; and taking ammonium sulfate, polyethylene glycol, hydroxyethyl cellulose or dodecyltrimethylammonium bromide as the dispersing agent, taking deionized water, ethanol, acetic acid or oxalic acid as a rheological phase solvent and adding the seed crystal to reduce the reaction and activation energy and improve the luminous intensity through doping. The coprecipitation-rheological phase preparation method is suitable for the preparation of LED (Light-Emitting Diode) fluorescent powder, trichromatic fluorescent powder, long afterglow fluorescent powder and PDP (Plasma Display Panel) fluorescent powder. The grain size of the fluorescent powder prepared by the invention is between nanometer and micrometer and can be adjusted through the seed crystal and the calcination temperature. The method has the advantages of simplicity, low equipment cost and large treatment amount and is suitable for the preparation of the fluorescent powder for various indication, display or illumination.

Description

technical field [0001] The present invention relates to a preparation method of fluorescent powder, in particular to a co-precipitation-rheological phase preparation method of rare earth-doped yttrium aluminum garnet fluorescent powder which can be effectively excited by ultraviolet light, purple light or blue light. Nano and micro YAG, SiO 2 Or SiC, etc. as seeds, prepared by co-precipitation-rheological phase method, the phosphor can be widely used in white light-emitting diodes (LED). Background technique [0002] Phosphor powder is one of the key materials in the field of display and lighting. The performance of the powder is mainly determined by its phase structure, particle morphology and luminescence characteristics. In order to prepare high-quality phosphors, innovations in preparation methods are required. [0003] A lot of research has been done on the preparation method of phosphor powder at home and abroad. Regarding the preparation of yttrium aluminum garnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
Inventor 胡章贵陆田野龙震宋浩亮
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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