Process for preparing aluminate fluorescent powder by coprecipitation method

A co-precipitation method and fluorescent powder technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problem of difficulty in preparing aluminate phosphor powder without ball milling, difficulty in obtaining fine and dispersed powder, hard agglomeration of phosphor particles, etc. problems, to achieve the effect of fine particles, good crystallization, and lower synthesis temperature

Inactive Publication Date: 2005-09-07
SOUTHEAST UNIV
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Problems solved by technology

However, our experiment found that the phosphor particles prepared by the above method still have hard agglomeration phenomenon, and it is difficult to obtain fine and dispersed powder
[0005] When using the co-precipitation method to synthesize aluminate matrix phosphors, Al 3+ easy to form Al(OH) 3 It precipitates in the form of gel, and the primary particles of th

Method used

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  • Process for preparing aluminate fluorescent powder by coprecipitation method
  • Process for preparing aluminate fluorescent powder by coprecipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This example is to use co-precipitation method to prepare PDP or phosphor with blue phosphor Ba 0.9 Eu 0.1 MgAl 10 o 17 .

[0023] 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 solution with deionized water, adjust pH=3 with nitric acid, add 2 mol / L NH containing 4 F In 0.005 mole of ammonium bicarbonate solution, 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, let it stand for precipitation, pour off the supernatant, and remove the precipitate Wash once with deionized water, dehydrate, and dry to obtain a fluffy powder; put the dried powder into an alumina crucible, and burn it for 1 hour at a temperature of 1300°C in a weak reducing atmosphere; put the burnt product into deionized water Wash until neutral, dry after dehydration, and pass through a 400-mesh sieve to obtain the desired phosph...

Embodiment 2

[0025] This example is to prepare the green fluorescent powder Ba for PDP by co-precipitation method 0.5 Sr 0.5 MgMn 0.2 Al 11 o 19 .

[0026] Weigh Al(NO 3 ) 3 .9H 2 O 1.1 mol, BaCO 3 0.05 mol, SrCO 3 0.05 mole, MgO0.1 mole, MnCO 3 0.02 mole, all the other conditions are with embodiment 1. The central particle diameter of the obtained high-efficiency PDP green phosphor is 2.4 μm.

Embodiment 3

[0028]This example is the preparation of green fluorescent powder Ce for three primary color fluorescent lamps by coprecipitation method 0.67 Tb 0.33 MgAl 11 o 19 .

[0029] Weigh Al(NO 3 ) 3 .9H 2 O 1.1 mol, CeO 0.67 mol, Tb 3 o 4 0.11 mole, MgO 0.1 mole, and all the other conditions are the same as in Example 1. The central particle diameter of the obtained green phosphor is 2.5 μm.

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Abstract

A method for preparing aluminate phosphor by means of coprecipitation, belonging to the preparing process for phosphor, comprising: (1) weighing the nitrate, carbonate, acetate or oxidate relevant to the metal according to the chemical composition of the aluminate phosphor, preparing the metallic ion mixing solution; (2) preparing ammonium acid carbonate solution, the concentration is 1~3 mol/l, modifying the pH value to be 8~10; (3) adding additive to the ammonium acid carbonate solution; (4) heating the solution to 20~80 DEG C, adding the metallic ion mixing solution to the mixing solution; (5) stirring; (6) stopping stirring, stewing or carrying out centrifugal sedimentation, dewatering, drying and getting the puffy powder; (8) igniting the dried powder; (9) washing the ignited product with deionized water to be neutral, dewatering, drying, sifting with the mesh size being 400 and getting the needed phosphor.

Description

technical field [0001] The invention relates to a preparation method of aluminate fluorescent powder. It belongs to the preparation technology of phosphor powder in the fields of displays, fluorescent lamps, LEDs, and light-storing materials. Background technique [0002] The preparation of aluminate fluorescent powder generally adopts high-temperature solid-state reaction method, such as the method for preparing aluminate green fluorescent powder in US Patent No. Raw materials such as magnesium are mixed with an appropriate amount of flux, and then burned at a temperature of 1200-1600°C in a nitrogen / hydrogen weak reducing atmosphere, and then the burned product is dispersed by ball milling, washed with water, dried and sieved. The addition of fluxes such as boric acid can significantly reduce the synthesis temperature, but it also causes serious sintering of the phosphor powder. The particle size of the phosphor powder must be reduced by ball milling...

Claims

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Application Information

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IPC IPC(8): C09K11/64
Inventor 董岩蒋建清于金方峰
Owner SOUTHEAST UNIV
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