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Preparation method of superfine high brightness fluorescent powder

A technology of phosphors and long-lasting phosphors, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of inability to obtain high-brightness long-lasting phosphors, high hardness, etc., and achieve the effect of improving brightness and avoiding performance degradation

Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the phosphor needs to be calcined at a high temperature at 1200-1400°C in a reducing atmosphere to obtain good luminescent properties. Although ultra-fine precursors can be prepared by using the sol-gel method or co-precipitation method, it will also occur in the later high-temperature reduction process. Sintering results in extremely high hardness. If the synthesis temperature is lowered, high-brightness long-lasting phosphors cannot be obtained.

Method used

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  • Preparation method of superfine high brightness fluorescent powder
  • Preparation method of superfine high brightness fluorescent powder

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preparation example Construction

[0022] The preparation process of the present invention comprises the following steps:

[0023] 1) Uniformly disperse the long-lasting phosphor in ethylene glycol to prepare a phosphor suspension with a concentration of 1-10g / 100ml;

[0024] 2) Press Al 2 o 3 The weight ratio with the phosphor is (0.5~10):100, and the corresponding amount of Al(NO) is weighed 3 9H 2 Add O into the phosphor suspension, stir and ultrasonically disperse for 5-30 minutes to fully disperse the phosphor;

[0025] 3) Heat the phosphor suspension to 80-90°C and control the temperature, and stir at a speed of 50r / m-300r / m;

[0026] 4) Prepare an anhydrous ethanol solution of KOH or NaOH with a concentration of 0.1-10g / 100m, drop the solution into the phosphor suspension at a rate of 0.5-10ml / min, and adjust the display value of the pH meter of the phosphor suspension to 3 ~6, after the dropwise addition, continue to stir and keep warm for 0.5~8 hours to obtain the coated phosphor suspension;

[0...

Embodiment 1

[0030] Weigh 20 grams of aluminate long-lasting phosphor with a central particle diameter of 4 μm, and prepare a phosphor suspension with a concentration of 2 g / 100 ml with ethylene glycol; weigh Al(NO) 3 9H 2 O 1 g, added to the phosphor suspension, stirred while ultrasonically dispersed for 30 min. The suspension was heated to 80°C and maintained while stirring. Prepare an anhydrous ethanol solution of KOH with a concentration of 0.1-10g / 100m, add the solution dropwise to the phosphor suspension at a rate of 2ml / min, control and adjust the pH meter display value of the phosphor suspension to 4, and stop adding , continue to keep warm and stir for 4 hours, centrifuge the suspension, wash it twice with absolute ethanol, and fully dry it in an oven. The coated phosphor was baked at 300°C for 1h. Put the coated phosphor at 1300°CN 2 +H 2 Calcining in a reducing atmosphere for 3 hours, and after cooling, the superfine high-brightness aluminate long-lasting phosphor can be ob...

Embodiment 2

[0032] Weigh 20 grams of aluminate long-lasting phosphor with a central particle diameter of 4 μm, and prepare a phosphor suspension with a concentration of 2 g / 100 ml with ethylene glycol; weigh Al(NO) 3 9H 2 O 1 g, added to the phosphor suspension, stirred while ultrasonically dispersed for 30 min. The suspension was heated to 90°C and maintained while stirring. All the other conditions are with embodiment 1.

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Abstract

The invention relates to a preparation method of superfine high brightness fluorescent powder, which comprises the following steps: using prior fine grain diameter long afterglow fluorescent powder for preparing the superfine high brightness long afterglow fluorescent powder, so as to obtain the long afterglow fluorescent powder with the grain diameter smaller than 5 microns but the luminous brightness equivalent to the commercial 15-micron brightness, coating a layer of high melting point oxide Al2O3 on the surface of fine grain diameter long afterglow fluorescent powder grains, high temperature restoring the fluorescent powder coated with the Al2O3 in a reducing atmosphere of 1200-1400 DEG C, and using an isolation function of the Al2O3 for the fluorescent powder in the restoration process to avoid the secondary rigid aggregation of the fluorescent powder grains. The related Al2O3 coating film has the chemical reaction formula of Al<3+>+3OH<->=Al(OH)3, and the reaction is carried out in an anhydrous system.

Description

technical field [0001] The invention relates to a preparation method of ultrafine particle diameter long afterglow fluorescent powder. It belongs to the technical field of fluorescent powder preparation. Background technique [0002] Long afterglow luminescent material, also known as luminous material, is a kind of photoluminescent material. It is a kind of substance that absorbs sunlight or light produced by artificial light sources and emits visible light, and can continue to emit light after the excitation stops. Alkaline-earth aluminate series luminescent materials are currently known light-storing luminescent materials with the best luminous performance. Compared with the long afterglow luminescent materials of the traditional sulfide series, the alkaline earth aluminate luminescent materials have the advantages of long afterglow time, no radiation, and stable chemical properties. [0003] Aluminate long afterglow powder is usually prepared by high-temperature solid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/64
Inventor 董岩邵起越曹同蒋建清
Owner SOUTHEAST UNIV