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Method for preparing superfine aluminate fluorescent powder

A phosphor and aluminate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of unstable phosphor performance and incomplete precipitation, and achieve the effects of accurate stoichiometric ratio, complete precipitation and stable process

Inactive Publication Date: 2010-03-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, after further research, it was found that the range given by this method is too broad, and it is easy to leave a small part of Al(OH) 3 Gel precipitation, resulting in a small amount of coarse particles may remain after high-temperature calcination, and there is incomplete precipitation in the phosphor system containing Ba ions, often need to add more Ba, and the performance of the obtained phosphor is also unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example is to use co-precipitation method to prepare PDP or phosphor with blue phosphor Ba 09 Eu 01 MgAl 10 o 17 .

[0035] Weigh Al(NO 3 ) 3 .9H 2 O 1 mol, BaCO 3 0.09 mol, MgO 0.1 mol, Eu 2 o 3 0.05 mole, prepare a clear mixed metal ion solution with deionized water, adjust pH=2 with nitric acid; prepare 2mol / L NH 4 F 0.005 moles of ammonium bicarbonate solution, and weighed 0.09 moles (NH4) 2 SO 4 Dissolve in the ammonium bicarbonate solution; add the mixed metal ion solution into the ammonium bicarbonate solution at a constant speed, keep the temperature at 30°C, adjust and control the pH=9 with ammonia water; continue stirring for 2 hours after the addition process is completed; stop stirring and let it stand Precipitate, discard the supernatant, wash the precipitate once with deionized water, dehydrate, and dry to obtain a fluffy powder; put the dried powder into an alumina crucible, and burn it at a temperature of 1500 °C in a weak reducing atmosp...

Embodiment 2

[0037] This example is to prepare the green fluorescent powder Ba for PDP by co-precipitation method 05 Sr 05 MgMn 02 Al 11 o 19 .

[0038] Weigh Al(NO 3 ) 3 .9H 2 O 1.1 mol, BaCO 3 0.05 mol, SrCO 3 0.05 mol, MgO 0.1 mol, MnCO 3 0.02 mole, prepare a clear mixed metal ion solution with deionized water, adjust pH=2 with nitric acid; prepare 2mol / L NH 4F 0.005 moles of ammonium bicarbonate solution, and weighed 0.05 moles (NH4) 2 SO 4 Dissolve in ammonium bicarbonate solution. All the other conditions are with embodiment 1.

Embodiment 3

[0040] This example is to use co-precipitation method to prepare PDP or phosphor with blue phosphor Ba 09 Eu 01 MgAl 10 o 17 .

[0041] Weigh Al(NO 3 ) 3 .9H 2 O 1 mol, BaCO 3 0.09 mol, MgO 0.1 mol, Eu 2 o 3 0.05 mole, prepare a clear mixed metal ion solution with deionized water, adjust pH=2 with nitric acid; prepare 2mol / L NH 4 F 0.005 moles of ammonium bicarbonate solution, and weighed 0.09 moles (NH4) 2 SO 4 Dissolve in the ammonium bicarbonate solution; add the mixed metal ion solution into the ammonium bicarbonate solution at a uniform speed, and keep the temperature at 40°C. All the other conditions are with embodiment 1.

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PUM

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Abstract

The invention relates to a method for preparing superfine aluminate fluorescent powder. An improved coprecipitation method is used for preparing the aluminate fluorescent powder, and simple process and large-scale production are realized. The central grain size of the prepared fluorescent powder is smaller than 3 micrometers, grain shapes are hexangular and flaky, and powder grains have uniform size distribution and no coarse grains. The prepared fluorescent powder has excellent luminous performance and can be used as a plasma display panel (PDP) material, tri-phosphor fluorescent powder or alight-cumulating type fluorescent material, and the like without ball-milling. The coprecipitation method is used for preparing the aluminate fluorescent powder. Under the condition of the invention,Al ions are precipitated in the form of ammonium aluminum carbonate hydroxide (NH4AlO(OH)HCO3) or hydrates thereof but are not precipitated in the form of Al(OH)3 gel. When being calcined at high temperature, the NH4AlO(OH)HCO3 can be decomposed without sintering, thus the phenomenon of agglomeration can be effectively avoided. Because the process is precisely controlled, no coarse grain residuesexist after high-temperature calcination.

Description

technical field [0001] The invention relates to a preparation method of aluminate fluorescent powder, and belongs to the technical field of fluorescent powder preparation. Background technique [0002] Aluminate phosphors are widely used in photo and display devices such as fluorescent lamps and PDPs due to their high chemical stability and excellent luminescent properties. Aluminate phosphors are generally prepared by a high-temperature solid-state reaction method. For example, the method for preparing aluminate green phosphors in US Patents US5989455, US5868963, and Chinese Patent CN1381547A is to prepare aluminum oxide, barium carbonate, manganese Raw materials such as magnesium oxide are mixed with an appropriate amount of flux, and then burned at a temperature of 1200-1600°C in a nitrogen / hydrogen weakly reducing atmosphere, and then the burned product is dispersed by ball milling, washed with water, dried, and sieved. Fluxes such as boric acid need to be added during ...

Claims

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Application Information

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IPC IPC(8): C09K11/64
Inventor 董岩邵起越韩学林蒋建清
Owner SOUTHEAST UNIV
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