Preparation method of LED (light-emitting diode) fluorescent powder

A phosphor and solution technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of irregular particle shape, narrow phosphor band, and uneven powder particle size, and achieve uniform powder particle size and fluorescence. The effect of high conversion efficiency and regular particle shape

Inactive Publication Date: 2013-10-23
KUSN KAIWEI ELECTRONICS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The LED phosphors that are currently popular in the market are gradually unable to meet the increasing requirements for LED lumens.
The phosphors on the market are YAG phosphors doped with Ce, and the preparation method of phosphors is too rough, single and simple, and this kind of phosphors gradually cannot meet the needs of the market.
Generally, commercial oxide powders are simply mixed, sintered, and pulverized, and the brightness of the phosphor produced is not high.
The reason for the low brightness is concentrated in the uneven particle size and irregular particle shape of the powder. It is difficult to achieve a pure phase by simply mixing the powder, and there are traces of impurity phases, which seriously affect the performance of the phosphor.
Moreover, the YAG-doped phosphor band is too narrow and concentrated within a certain range.

Method used

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preparation example Construction

[0015] A kind of preparation method of LED fluorescent powder of the present invention, comprises the steps:

[0016] (1). Dissolve ytterbium oxide, cerium oxide, and lutetium oxide in concentrated nitric acid in proportion to prepare a solution, and add aluminum nitrate solution to obtain mother liquor;

[0017] (2). Using urea as a precipitating agent and sodium metaphosphate as a dispersing agent, control the temperature and time to completely precipitate ytterbium and aluminum ions to obtain an amorphous precursor;

[0018] (3). The amorphous precursor is calcined and directly crystallized into a single-phase powder, then ground and pulverized, then added with a sintering aid, and sintered in a hydrogen-nitrogen reducing atmosphere;

[0019] (4). White light LED phosphor obtained by crushing, washing and sieving after cooling.

[0020] In step (1), the aluminum nitrate solution is added according to the total amount of ytterbium plus ytterbium and the ion ratio of aluminu...

Embodiment 1

[0022] In this embodiment, the molar ratio of urea to metal salt ions is 30:1; the calcination temperature of the amorphous precursor is 800° C.; the sintering temperature in a hydrogen-nitrogen reducing atmosphere is 1675° C.

Embodiment 2

[0024] In this embodiment, the molar ratio of urea to metal salt ions is 2:1; the calcination temperature of the amorphous precursor is 700° C.; the sintering temperature in a hydrogen-nitrogen reducing atmosphere is 1600° C.

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Abstract

The invention discloses a preparation method of LED (light-emitting diode) fluorescent powder. The preparation method comprises the following steps of: firstly preparing a precursor of the LED fluorescent powder by using a urea precipitation method, then grinding and crushing, then adopting a sintering auxiliary to sinter in a reducing atmosphere, cooling, and then performing the procedures of crushing, screening, acid-washing and the like to finally obtain the fluorescent powder. The obtained LED fluorescent powder has the advantages of high brightness, uniform particle size of the powder, uniform dispersion, regular particle shape, good particle consistency, high fluorescence conversion efficiency and broad band.

Description

technical field [0001] The invention relates to a preparation method of LED fluorescent powder, in particular to a preparation method of white LED fluorescent powder. Background technique [0002] With the rapid development of white LEDs, the lumen requirements of LEDs are getting higher and higher, which requires higher and higher phosphor efficiency. The LED phosphors that are currently popular in the market are gradually unable to meet the increasing requirements for LED lumens. The phosphor powder on the market is YAG phosphor powder doped with Ce, and the preparation method of phosphor is too rough, single and simple, and this phosphor powder cannot meet the demand of the market gradually. Generally, commercial oxide powders are simply mixed, sintered, and pulverized, and the brightness of the produced phosphors is not high. The reason for the low brightness is that the particle size of the powder is uneven and the shape of the particles is irregular. It is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 梁月山
Owner KUSN KAIWEI ELECTRONICS
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