Preparation method of nano yttrium aluminum garnet fluorescent powder

A technology for yttrium aluminum garnet and phosphor powder, which is applied in the field of preparing nanometer yttrium aluminum garnet phosphor, can solve the problems of wide particle size distribution, powder agglomeration, and high preparation cost, and achieves narrow particle size distribution, complete crystal form, and high technology. simple effect

Inactive Publication Date: 2012-03-28
XIANGTAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN1907860A discloses a preparation method for preparing yttrium aluminum garnet nano-powder. The main raw materials are aluminum nitrate, yttrium nitrate and nitrates of other rare earth elements. Alcohol-water composite solvent co-precipitation method is adopted. The preparation method has It has the advantages of controllable and stable single-phase yttrium aluminum garnet nanopowder, but its disadvantages are long titration process, long production cycle and high preparation cost
[0007] Chinese patent CN101289218A discloses a preparation method for preparing yttrium aluminum garnet nano-powder, the main raw materials of which are aluminum nitrate and yttrium nitrate, wherein a spraying method is adopted, and the mixed solution of aluminum nitrate and yttrium nitrate is added dropwise to the urea solution, The obtained precursor is calcined to obtain nano-yttrium aluminum garnet powder. The disadvantage is that the obtained powder has obvious agglomeration phenomenon.
[0008] In the known preparation methods so far, its disadvantages are: the dispersibility of the obtained yttrium aluminum garnet powder is poor, the shape of the particles is not uniform, the particle size distribution is wide, and it is difficult to control the particles in the nanoscale

Method used

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  • Preparation method of nano yttrium aluminum garnet fluorescent powder
  • Preparation method of nano yttrium aluminum garnet fluorescent powder
  • Preparation method of nano yttrium aluminum garnet fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take 21.30 grams of aluminum nitrate and 16.5 grams of yttrium nitrate according to a molar ratio of 5:3 and mix them uniformly, add deionized water to prepare a 2L mixed solution, and make a mother solution with a total cation concentration of 0.16mol / L, and use a spiral channel type rotating bed ultra The gravity reactor generates a supergravity field, reacts and circulates in the supergravity field, adds weak alkali alcohol aqueous solution to the supergravity field reactor, and controls the pH of the solution at 7.0-8.0 to obtain a suspension. The resulting suspension was aged at 60°C for 2 h, then filtered with suction, and washed three times with deionized water. Add the filter cake to 200ml of absolute ethanol, and filter with suction after ultrasonic vibration. Microwave drying at 60°C for 4h yielded a loose precursor. The obtained precursor was placed in a microwave field, and the temperature was raised from room temperature to 1000° C. for 2 hours with a prog...

Embodiment 2

[0057] Get 21.30 grams of aluminum nitrate and 16.50 grams of yttrium nitrate according to the molar ratio of 5:3 and mix evenly, add deionized water and be mixed with 2L of mixed solution, be made into the mother liquor that total cation concentration is 0.16mol / L, circulate in the supergravity field, Add a weak alkali alcohol aqueous solution to control the pH value of the solution at 7.0-8.0 to obtain a suspension. The resulting suspension was aged at 60°C for 2 h, then filtered with suction, and washed three times with deionized water. Add the filter cake to 200ml of absolute ethanol, and filter with suction after ultrasonic vibration. Microwave drying at 60°C for 4h yielded a loose precursor. The obtained precursor is placed in a microwave field, and the temperature is rapidly and directly raised from room temperature to 1000° C., and kept for 2 hours to obtain a loose yttrium aluminum garnet phosphor.

[0058] Microwave Calcination:

[0059] The method is as follows: ...

Embodiment 3

[0061] The nano-yttrium aluminum garnet phosphor was prepared according to the same method as in Example 1, except that the holding time was set to 0.5 h.

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Abstract

The invention discloses a preparation method of a nano yttrium aluminum garnet fluorescent powder, comprising the following steps of: preparing raw materials such as aluminium nitrate, yttrium nitrate and nitrate of the rare earth elements into mother liquor of which the total cation concentration is 0.1-1.0mol/L according to the proportion of 5: (3-X): X, wherein X is 0-0.1, reacting the evenly-mixed mother liquor in a depositing way by the means that weak base alcohol water solution or ammonia is added into an ultra-gravity field, and controlling the pH value at 7.0-8.0 so as to obtain turbid liquid; performing aging, extraction filtering, and microwave drying on the turbid liquid so as to obtain a precursor body; and putting the precursor body in a microwave field, and calcinating the precursor body so as to obtain a yttrium aluminum garnet fluorescent powder which is good in dispersity and has the particle size of 20-100 nanometers. Compared with the prior art, the preparation method has the advantages that the product has the mean grain size of about 20-100 nanometers, and the product is narrow in particle size distribution, free of conglobation, good in dispersity, high in crystallization degree, and free of transient phase. Furthermore, the preparation method is simple in technology, and can be used for quickly producing the nano yttrium aluminum garnet fluorescent powder in batches.

Description

technical field [0001] The invention relates to a method for preparing fluorescent powder, in particular to a novel method for preparing nanometer yttrium aluminum garnet fluorescent powder. Background technique [0002] In recent years, many countries or regions around the world have successively launched "green lighting" plans to ban the use of incandescent lamps and promote the use of energy-saving lamps. From a global perspective, the development trend of energy-saving lamps replacing incandescent lamps is irreversible, and it is expected to drive my country's energy-saving lamp industry. rapid development. In the field of displays, with the popularization of LCD, PDP and other flat panel displays, replacing the traditional CRT market, it is expected that the market demand for rare earth luminescent materials for display will increase year by year. According to the forecast of the National Rare Earth Phosphor Powder and Lamp Cooperation Network, by 2013, the output of my...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 周继承曾敏孟翔
Owner XIANGTAN UNIV
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