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Method of preparing nano-level sphere cerium activated yttrium aluminum garnet phosphor powder

A yttrium aluminum garnet, nano-scale technology is applied in the field of rare earth composite oxide luminescent materials to achieve the effects of avoiding environmental pollution, good luminescence performance and good powder dispersion

Inactive Publication Date: 2007-11-28
TSINGHUA UNIV
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  • Summary
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  • Application Information

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Problems solved by technology

No one has prepared YAG:Ce phosphor by this method

Method used

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preparation example Construction

[0023] The invention provides a method for preparing nanoscale spherical cerium-activated yttrium aluminum garnet fluorescent powder. The method adopts a microemulsion system with a water-in-oil (W / O) structure, and uses the microemulsion droplets in the microemulsion system as nano micro-reactions. The device is to solubilize the oil phase transparent solution comprising oil phase substance, surfactant, co-surfactant and the water phase liquid comprising reactant solution or precipitant solution in a ratio of 1: (0.1~1) by volume, to obtain Microemulsion system, the microemulsion droplets in the microemulsion system are used as nano-microreactors, react in the microreactor to obtain precipitates, extract the precipitates, wash, filter, dry, and calcinate to obtain spherical and nanoscale YAG : Ce phosphor.

[0024] The preparation steps of the nanoscale spherical cerium-activated yttrium aluminum garnet phosphor are as follows:

[0025] 1) Preparation of the oil phase soluti...

Embodiment 1

[0041] Embodiment 1: at room temperature, yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), aluminum nitrate (Al(NO 3 ) 3 9H 2 O) and cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) Follow Y 2.95 al 5 o 12 : The stoichiometric ratio of 0.05Ce is prepared into a salt solution with a total cation concentration of 1.0mol / L. Since the system is a uniform aqueous solution, yttrium, aluminum and cerium can be uniformly mixed at the molecular level; the ammonia water is prepared into 4.0mol / L precursor solution.

[0042] The oil phase was prepared by n-hexane, cyclohexane, Triton X-100 and n-hexanol in a volume ratio of 100:2:60:60. Then according to the volume ratio of n-hexane: solubilizing aqueous solution = 100:97, add equal volumes of (yttrium+aluminum+cerium) salt solution and ammonia solution respectively to the oil phase, shake gently to obtain colorless and transparent microemulsion C , D. Take 150ml microemulsions C and D respectively, mix and react under magnetic stirring for 20min ...

Embodiment 2

[0043] Embodiment 2: Yttrium oxide (Y 2 o 3 ) is dissolved in an appropriate amount of nitric acid to make yttrium nitrate, and cerium oxide (Ce 2 o 3 ) was dissolved in an appropriate amount of nitric acid to make cerium nitrate, and then mixed with aluminum chloride (AlCl 3 ·6H 2 O) Follow Y 2.90 al 5 o 12 : 0.1Ce 3+ The stoichiometric ratio is prepared into a precursor solution with a total concentration of cations of 0.5mol / L, and oxalic acid is prepared into a solution of 2.0mol / L, and then other additives are added to the solution to adjust the properties of the solution to form a precipitant solution . At room temperature, prepare an oil phase solution with n-hexane, cyclohexane, Triton X-100, and n-hexanol at a volume ratio of 100:17:82:64. Then, according to the volume ratio of n-hexane:solubilizing aqueous solution=100:20, an equal amount of (yttrium+aluminum+cerium) salt solution and precipitant solution were added respectively to the solution, and the rest...

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Abstract

The present invention belongs to the field of composite RE oxide as light emitting material, and is process of preparing nanometer level spherical Ce activated YAG phosphor. The process includes the reaction between the transparent oil phase emulsion comprising oil phase material, surfactant and co-surfactant and the aqueous phase liquid comprising reactant solution or precipitant solution in the volume ratio of 1 to (0.1-1) in the micro emulsion drop serving in W / O micro emulsion system as the nanometer micro reactor to obtain the precipitate, washing the precipitate, suction filtering, drying and calcining to obtain nanometer level spherical YAG:Ce phosphor with high dispersivity. The process is simple, low in power consumption, environment friendly, low in cost and suitable for industrial production, and the YAG:Ce phosphor has high luminous intensity and light emitting efficiency.

Description

technical field [0001] The invention belongs to the field of rare earth composite oxide luminescent materials, in particular to a preparation method of nanoscale spherical cerium-activated yttrium aluminum garnet fluorescent powder. Background technique [0002] Cerium (Ce) activated yttrium aluminum garnet, Y 3-x al 5 o 12 :xCe 3+ , referred to as YAG:Ce, with an excitation spectrum around 460 nm, can effectively absorb the blue light emitted by gallium nitride / indium gallium nitride light-emitting diodes (LEDs) to emit yellow light, and recombine with the remaining blue light to form high-brightness white light , made of high-brightness white LED. Phosphor powder with a garnet structure has the characteristics of stable chemical properties, high brightness, good color rendering, long life and high luminous efficiency. At present, the preparation methods of YAG:Ce phosphor include solid-state reaction method, sol-gel method, precipitation method, spray pyrolysis method...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 黄勇郭瑞曾人杰吴音
Owner TSINGHUA UNIV
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