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Method for preparing cerium-activated yttrium aluminium garnet fluorescent powder

A technology of yttrium aluminum garnet and phosphor powder is applied in the field of phosphor powder to achieve the effects of changing sintering temperature, low production cost and shortened time.

Inactive Publication Date: 2008-01-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0035] The purpose of the present invention is to provide a generalized method for preparing cerium-activated yttrium aluminum garnet (YAG:Ce) phosphors for the defects of the existing method for preparing YAG:Ce phosphors and the difficulties in realizing industrialization

Method used

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  • Method for preparing cerium-activated yttrium aluminium garnet fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: Y 2.96 al 5 o 12 : Ce 0.04 Phosphor powder preparation

[0057] Take 3.342g Y 2 o 3 , added to a solution made of 6.1mL concentrated nitric acid and 100mL deionized water, heated to dissolve and remove slightly excess nitric acid; add 18.757gAl(NO) 3 9H 2 O and 0.174g Ce(NO) 3 ·6H 2 O, use deionized water to make a solution with a total concentration of metal ions of 0.4mol / L. Weigh 12.607g of oxalic acid and dissolve it in 200mL of deionized water, and adjust the pH value to 9.5 with ammonia water. Add the mixed solution of the metal salt dropwise into the composite precipitant under constant stirring, keep the solution temperature at 50°C, and the dropping rate is 2mL / min. After the dropwise addition, it was aged for 12 hours and then filtered, and the precipitate was washed with deionized water and absolute ethanol respectively, and then dried in an oven at 60°C for 12 hours. Add 4.5% of the target product mass as NaF as a flux, mix and grind. ...

Embodiment 2

[0058] Example 2: Y 2.94 al 5 o 12 : Ce 0.06 Phosphor powder preparation

[0059] Similar to Example 1, the difference is as follows:

[0060] (1) Raw material ratio is 3.319g Y 2 o 3 , 18.757g Al(NO 3 ) 3 9H 2 O and 0.261g Ce(NO 3 ) 3 ·6H 2 O; be made into a solution with a total concentration of metal ions of 0.3mol / L; the amount of oxalic acid is 20.171g, dissolved in 200mL of water, and the pH value is adjusted to 9 with ammonia water.

[0061] (2) flux consumption is 1.1% of target product quality, wherein BaF 2 and H 3 BO 3 Each accounts for 0.55%; the temperature of the solid phase reaction is 1200°C, and the temperature is kept for 1h.

[0062] (3) High-temperature sintering at 1500° C. for 4 hours.

Embodiment 3

[0063] Example 3: Y 2.94 al 4 GaO 12 : Ce 0.06 Phosphor powder preparation

[0064] Similar to Example 1, the difference is as follows:

[0065] (1) Raw material ratio is 3.319g Y 2 o 3 , 15.006gAl(NO 3 ) 3 9H 2 O, 2.841g GaCl 3 ·6H 2 O and 0.261gCe(NO 3 ) 3 ·6H 2 O; made into a solution with a total concentration of metal ions of 0.25mol / L.

[0066] (2) flux consumption is 2% of target product quality, wherein NaF accounts for 1.25%, H 3 BO 3 Accounting for 0.75%; the temperature of the solid phase reaction is 1200°C, and the temperature is kept for 1h.

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Abstract

The invention relates to a preparation method of yttrium aluminum garnet phosphor activated by cerium and a phosphor. The invention provides a generalized preparation method of yttrium aluminum garnet phosphor activated by cerium. A chemical formula is Y3-x-y-zRyAl5-mGamO12: Cex, R'z. The preparation method comprises the steps of: preparation of metal ions solutions, preparation of precipitant solutions, preparation of metal ions precipitants, addition of flux and solid phase reaction, sintering, grinding powders sintered under high temperature, pickling, alkali washing, water washing and drying, then the target product YAG:Ce phosphor, which has high luminous intensity, low agglomeration degree without ball milling, proper powder size and narrow particle size distribution, is obtained; besides, the phosphor has low agglomeration degree after being treaded under high temperature, and the phosphor can be packed and sealed without ball milling and can maximize the excellent optical property.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a method for preparing generalized cerium-activated yttrium aluminum garnet (YAG:Ce) fluorescent powder for white light-emitting diode (LED) lighting by an oxalic acid co-precipitation method. Background technique [0002] White LED and its combined light source have the advantages of solidification, small size, long life, shock resistance, not easy to damage, fast start-up response, low power consumption and no pollution. It is known as the fourth generation of lighting source, also known as the 21st century green light source. The use of generalized YAG:Ce phosphor is the mainstream of current development. This phosphor can effectively absorb the blue light of the InGaN / GaN chip and emit yellow light, which is mixed with the unabsorbed blue light to obtain white light. Therefore, the progress of YAG:Ce phosphor preparation technology plays a very important role in the development of wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 曾人杰林成通苏勉曾郭瑞
Owner XIAMEN UNIV
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