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Method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder

A yttrium aluminum garnet and phosphor technology, which is applied in nano-optics, nano-technology, nano-technology, etc., can solve the problems of coarse phosphor particles, uneven distribution of encapsulated phosphor particles, and high synthesis temperature, so as to solve the problems of agglomeration and The effect of sintering problems, ease of mass production, and simple preparation methods

Active Publication Date: 2018-07-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial YAG phosphors are all prepared by high-temperature solid-phase method. The synthesis temperature is high, and the prepared phosphor particles are coarse. The particle size is generally about 10-20 μm. The particles are too coarse, which brings two defects: (1) Fluorescence During the packaging process, the powder particles settle in the packaging glue because the specific gravity is much higher than that of the liquid packaging glue, resulting in uneven distribution of phosphor particles in the packaging glue, and it is difficult to ensure the consistency of light color of white LEDs. low yield
However, since the synthesis temperature of the YAG phase is as high as 1000 °C, it is difficult to avoid the agglomeration and sintering of the particles during the synthesis process, so it is difficult to obtain dispersed nanoparticles.
So far, there is no report on dispersing YAG particles and transparent YAG fluorescent glue

Method used

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  • Method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder
  • Method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder

Examples

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Effect test

Embodiment 1

[0039]Example 1: Prepare 2 L of potassium sulfate solution with a concentration of 0.1 mol / L with deionized water, add polyacrylic acid with 5% salt weight, and dissolve it. Under the condition of stirring, drop the potassium sulfate solution containing polyacrylic acid into 50 liters of ethanol, wash the precipitate with ethanol for 1-2 times, and obtain nanometer potassium sulfate after drying. Weigh 20 grams of nano-potassium sulfate, disperse it in 200 ml of ethanol, add 0.5 grams of stearic acid, and keep stirring at 50° C. for 2 hours. After centrifuging the nano-potassium sulfate ethanol dispersion, disperse the nano-potassium sulfate in 200ml of xylene, add 10g of YAG carbonate precursor, stir at 80°C for 2 hours, centrifuge, dry, and calcinate at 1000°C for 2 hours, then at 800°C Calcined in a reducing atmosphere at 100°C for 2 hours, washed with water and dried to obtain nanometer YAG fluorescent powder.

Embodiment 2

[0040] Example 2: Prepare 2 L of potassium sulfate solution with a concentration of 0.1 mol / L with deionized water, add polyacrylic acid with 5% salt weight, and dissolve it. Under the condition of stirring, drop the potassium sulfate solution containing polyacrylic acid into 50 liters of ethanol, wash the precipitate with ethanol for 1-2 times, and obtain nanometer potassium sulfate after drying. Weigh 0.2 g of nano-potassium sulfate, disperse it in 200 ml of ethanol, add 0.02 g of stearic acid, and keep stirring at 50° C. for 2 hours. After centrifuging the nano potassium sulfate ethanol dispersion, disperse the nano potassium sulfate in 200ml xylene, add 0.1g YAG carbonate precursor, stir at 80°C for 2 hours, centrifuge, dry, calcinate at 1000°C for 2 hours, and then Calcined in a reducing atmosphere at 800 degrees Celsius for 2 hours, washed with water, and dried to obtain nanometer YAG fluorescent powder.

Embodiment 3

[0041] Example 3: Prepare 2 L of potassium sulfate solution with a concentration of 0.1 mol / L with deionized water, add polyacrylic acid with 5% salt weight, and dissolve it. Under the condition of stirring, drop the potassium sulfate solution containing polyacrylic acid into 50 liters of ethanol, wash the precipitate with ethanol for 1-2 times, and obtain nanometer potassium sulfate after drying. Weigh 10 grams of nano-potassium sulfate, disperse it in 200 ml of ethanol, add 0.5 grams of stearic acid, and keep stirring at 50° C. for 2 hours. After centrifuging the nano potassium sulfate ethanol dispersion, disperse the nano potassium sulfate in 200ml xylene, add 5g of YAG carbonate precursor, stir at 80°C for 2 hours, centrifuge, dry, calcinate at 1000°C for 2 hours, and then at 800°C Calcined in a reducing atmosphere at 100°C for 2 hours, washed with water and dried to obtain nanometer YAG fluorescent powder.

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Abstract

The invention provides a method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder. Carbonate precursor particles of YAG are dispersed and isolated with nano potassium sulfate in xylene, after centrifugal precipitation, precipitates are dried and then calcined at the high temperature, a calcined product is secondarily calcined in the reduction atmosphere, and high-dispersity nanoYAG fluorescent powder with good light emitting performance can be obtained after water washing. By means of the method, the nano YAG fluorescent powder with good dispersity and perfect crystals can be rapidly prepared in batches. The fluorescent powder can be made into transparent fluorescent gelatin, light scattering loss is eliminated, and the problem of inconsistency of light color of a white-light LED due to settlement can be solved.

Description

technical field [0001] The invention relates to a technology for preparing nano-yttrium aluminum garnet fluorescent powder, which belongs to the technical field of photoelectric materials. Background technique [0002] Ce3+ activated yttrium aluminum garnet yellow phosphor (Y 3 Al 5 o 12 : Ce, or YAG: Ce) has high luminous efficiency and pure light color, and is one of the important components of commercial white LEDs. [0003] The particle size of phosphor powder has a great influence on the light color performance of white light LED. At present, commercial YAG phosphors are all prepared by high-temperature solid-phase method. The synthesis temperature is high, and the prepared phosphor particles are coarse, and the particle size is generally about 10-20 μm. The particles are too coarse, which brings two defects: (1) Fluorescence During the packaging process, the powder particles settle in the packaging glue because the specific gravity is much higher than that of the l...

Claims

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Application Information

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IPC IPC(8): C09K11/80B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/7774
Inventor 董岩王宇婷卞仙邵起越蒋建清
Owner SOUTHEAST UNIV
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