Method of preparing cerium activated yttrium aluminium garnet ultrafine fluorescent powder using coprecipitation

A technology of yttrium aluminum garnet and co-precipitation, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of wide particle size distribution, large product particle size, high synthesis temperature, etc., and achieve high color rendering index and high doping concentration , the effect of high luminous intensity

Inactive Publication Date: 2006-01-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Solid phase reaction synthesis has great disadvantages, such as high synthesis temperature, large product particle size and wide...

Method used

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Embodiment 1

[0012] Y 2.95 al 5 o 12 : Ce 0.05 Phosphor powder preparation

[0013] Aluminum ions are prepared into a 1 mol / l solution, yttrium ions are prepared into a 0.5 mol / l solution, and cerium ions are prepared into a 0.1 mol / l solution. The total concentration of cations is 0.3mol / l, according to Y 2.95 al 5 o 12 : Ce 0.05 Stoichiometric ratios were measured for each solution and mixed evenly. Composite precipitant: ammonia water concentration 3mol / l, ammonium bicarbonate concentration 1mol / l. Add the mother salt solution dropwise to the composite precipitant under stirring condition, the stirring speed is 800r / min, the dropping speed is 1ml / min, the reaction temperature is 40°C, the aging temperature is 50°C, and the aging time is 12h. After the precipitate was filtered, it was washed with deionized water and absolute ethanol, and dried in an oven at 120°C for 12 hours. The precipitate was calcined at 500°C for 2h under a hydrogen atmosphere. After grinding, it was calc...

Embodiment 2

[0015] Y 2.93 al 5 o 12 : Ce 0.07 Phosphor powder preparation

[0016] Prepare aluminum ions into a 2 mol / l solution, yttrium ions into a 1 mol / l solution, and cerium ions into a 0.1 mol / l solution. The total concentration of cations is 0.4mol / l, according to Y 2.93 al 5 o 12 : Ce 0.07 Stoichiometric ratios were measured for each solution and mixed evenly. Composite precipitant: ammonia water concentration 4mol / l, ammonium bicarbonate concentration 1mol / l. Add the mother salt solution dropwise to the composite precipitant under stirring condition, the stirring speed is 1000r / min, the dropping speed is 2ml / min, the reaction temperature is 40°C, the aging temperature is 50°C, and the aging time is 12h. After the precipitate was filtered, it was washed with deionized water and absolute ethanol, and dried in an oven at 120°C for 12 hours. The precipitate was calcined at 500°C for 2h under a hydrogen atmosphere. After grinding, it was calcined at 1000° C. for 2 hours und...

Embodiment 3

[0018] Y 0.93 Lu 2 al 5 o 12 : Ce 0.07 Phosphor powder preparation

[0019] Prepare aluminum ions into a 0.5 mol / l solution, yttrium ions into a 0.5 mol / l solution, lutetium ions into a 0.5 mol / l solution, and cerium ions into a 0.1 mol / l solution. The total concentration of cations is 0.1mol / l, according to Y 0.93 Lu 2 al 5 o 12 : Ce 0.07 Stoichiometric ratios were measured for each solution and mixed evenly. Composite precipitant: ammonia water concentration 1mol / l, ammonium bicarbonate concentration 1mol / l. Add the mother salt solution dropwise to the composite precipitant under stirring condition, the stirring speed is 800r / min, the dropping speed is 3ml / min, the reaction temperature is 40°C, the aging temperature is 50°C, and the aging time is 12h. After the precipitate was filtered, it was washed with deionized water and absolute ethanol, and dried in an oven at 120°C for 12 hours. The precipitate was calcined at 500°C for 2h under a hydrogen atmosphere. Aft...

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Abstract

A process for preparing the superfine fluorescent powder of Ce activated YAG by codeposition includes such steps as dissolving aluminium nitrate in deionized water, dissolving RE oxide in nitric acid, proportional mixing to obtain mother salt solution, preparing the solution of composite precipitant from ammonia water and ammonium dicarbonate, dripping the mixed solution to the solution of composite precipitant, depositing, ageing, filter, washing with deionized water, dewatering by absolute alcohol, baking to obtain precursor, pulverizing, and calcining in weak reducing gas.

Description

technical field [0001] The invention relates to a preparation method in the technical field of materials, in particular to a method for preparing cerium-activated yttrium aluminum garnet ultrafine fluorescent powder by co-precipitation. Background technique [0002] Cerium-activated yttrium aluminum garnet, namely YAG: Ce, and garnet composed of various rare earth elements can effectively absorb the blue light of gallium nitride (GaN) chips and recombine with it to form high-brightness white light. Compared with traditional lighting sources, white LEDs composed of gallium nitride chips and cerium-activated yttrium aluminum garnets have many advantages, such as: small size, low energy consumption, fast response, long life, and no pollution. Therefore, the emergence of white LEDs has attracted the enthusiastic attention of governments, academic circles and enterprises in various countries, and has become a hot topic in the fields of optoelectronics and lighting engineering tec...

Claims

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Application Information

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IPC IPC(8): C09K11/77
Inventor 刘河洲常耀辉张凯胡文彬孙康
Owner SHANGHAI JIAO TONG UNIV
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