Preparation method of yttrium aluminum garnet (YAG): Ce<3+> fluorescent powder using chlorides as fluxing agents

A technology of flux and phosphor, applied in the direction of chemical instruments and methods, luminescent materials, etc., to achieve the effect of improved light conversion efficiency and narrow morphology

Inactive Publication Date: 2013-01-09
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no YAG:Ce made of chloride as a flux. 3+ Phosphor powder report

Method used

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  • Preparation method of yttrium aluminum garnet (YAG): Ce&lt;3+&gt; fluorescent powder using chlorides as fluxing agents
  • Preparation method of yttrium aluminum garnet (YAG): Ce&lt;3+&gt; fluorescent powder using chlorides as fluxing agents
  • Preparation method of yttrium aluminum garnet (YAG): Ce&lt;3+&gt; fluorescent powder using chlorides as fluxing agents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to phosphor composition (Y 0.98 ) 3 Al 5 o 12 : Ce 0.06 Weigh the stoichiometric Y 2 o 3 (99.99%), CeO 2 (99.99%), Al 2 o 3 (AR) and fluxing agent LiCl accounting for 4% of the total weight of the phosphor composition, put the stoichiometric mixture containing the fluxing agent into an agate mortar, add an appropriate amount of absolute ethanol to make the sample just submerged, and grind for 1 hour until fully mixed; then the mixture is transferred to a small corundum crucible of 5ml, and the small corundum crucible is placed in a 30ml corundum crucible equipped with activated carbon for calcination. ~1350°C, the calcination time is 2 hours; the obtained sample is washed twice with dilute nitric acid, and then washed twice with deionized water; finally, the sample is dried in a 90°C drying oven for 3 hours. The obtained phosphor light conversion efficiency is 2.2.

Embodiment 2

[0025] According to phosphor composition (Y 0.98 ) 3 Al 5 o 12 : Ce 0.06 Weigh the stoichiometric Y 2 o 3 (99.99%), CeO 2 (99.99%), Al 2 o 3 (AR) and fluxing agent NaCl accounting for 4% of the total weight of the phosphor composition, put the stoichiometric mixture containing the fluxing agent into an agate mortar, add an appropriate amount of absolute ethanol to make the sample just submerged, and grind for 1 hour until fully mixed; then the mixture is transferred to a small corundum crucible of 5ml, and the small corundum crucible is placed in a 30ml corundum crucible equipped with activated carbon for calcination. ~1350°C, the calcination time is 2 hours; the obtained sample is washed twice with dilute nitric acid, and then washed twice with deionized water; finally, the sample is dried in a 90°C drying oven for 3 hours. The obtained phosphor has a light conversion efficiency of 2.8.

Embodiment 3

[0027] According to phosphor composition (Y 0.98 ) 3 Al 5 o 12 : Ce 0.06 Weigh the stoichiometric Y 2 o 3 (99.99%), CeO 2 (99.99%), Al 2 o 3 (AR) and fluxing agent KCl accounting for 4% of the total weight of the phosphor composition, put the stoichiometric mixture containing the fluxing agent into an agate mortar, add an appropriate amount of absolute ethanol to make the sample just submerged, and grind for 1 hour until fully mixed; then the mixture is transferred to a small corundum crucible of 5ml, and the small corundum crucible is placed in a 30ml corundum crucible equipped with activated carbon for calcination. ~1350°C, the calcination time is 2 hours; the obtained sample is washed twice with dilute nitric acid, and then washed twice with deionized water; finally, the sample is dried in a 90°C drying oven for 3 hours. The obtained phosphor has a light conversion efficiency of 2.7.

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Abstract

The invention relates to a preparation method of yttrium aluminum garnet (YAG): Ce<3+> fluorescent powder using chlorides as fluxing agents and belongs to the field of light-emitting materials. According to the preparation method, Y2O3 (99.99%), CeO2 (99.99%), Al2O3 (analytical pure, namely AR) and the fluxing agents which contain LiCl, NaCl, KCl and SrCl2 are weighted in the stoichiometric ratio according to fluorescent powder composition (Y0.98)3Al5O12:Ce0.06, wherein the fluxing agents account for 1%-13% of the total weight. By adding the fluxing agents, the light conversion efficiency of the YAG:Ce<3+> fluorescent powder can be increased and the formation temperature of the single-phase YAG can be reduced; improvement of the crystallinity and morphology of the YAG:Ce<3+> fluorescent powder is beneficial to absorption and emission of the light; and the preparation method adopts a high temperature solid state method, chlorides used as the fluxing agents, namely LiCl, NaCl, KCl and SrCl2 are added to prepare the YAG:Ce<3+> fluorescent powder and the obtained YAG:Ce<3+> fluorescent powder maintains the structure, regular morphology and narrow particle size distribution of YAG, thus the light conversion efficiency of the YAG:Ce<3+> fluorescent powder is greatly increased.

Description

technical field [0001] The present invention relates to luminescent materials, in particular to a kind of YAG:Ce with chloride as flux 3+ Preparation method of fluorescent powder. Background technique [0002] In recent years, the most striking research achievement in the lighting field is the rise of semiconductor lighting sources (also known as "white LEDs"). As far as white LED technology is concerned, the combination of "blue LED + yellow fluorescent material" is currently recommended. It is also the mainstream way to commercialize white LED products. In this way, the yellow YAG:Ce phosphor is coated on the GaN blue chip to synthesize white light, because when the yellow phosphor is excited by the LED blue light, it will emit yellow-green light with a wide wavelength range, and this part of the light will be It synthesizes white light in the visual sense with part of the blue light passing through the phosphor. Among them, the performance of YAG:Ce yellow fluorescent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 张宝昌张德文周迪刘英博赵振波
Owner CHANGCHUN UNIV OF TECH
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