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Process for preparing rare-earth excited strontium aluminate long afterglow fluorescent powder

A fluorescent powder and alumina technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high reaction temperature, lower reaction temperature, poor luminescent performance of phosphor powder, etc., achieve low roasting temperature, high luminous brightness, good The effect of luminous performance matching

Inactive Publication Date: 2007-01-24
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using the solid-state reaction method to prepare phosphors, it is difficult to mix the raw materials evenly, the reaction temperature is high, the product particle size is large, the particles are irregular, and the surface is uneven, but its luminescence performance is often better; sol-gel method and spray When the phosphor powder is prepared by the drying method, the raw materials can be mixed evenly at the molecular level, and the reaction temperature can be lowered. (brightness) poor

Method used

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  • Process for preparing rare-earth excited strontium aluminate long afterglow fluorescent powder
  • Process for preparing rare-earth excited strontium aluminate long afterglow fluorescent powder
  • Process for preparing rare-earth excited strontium aluminate long afterglow fluorescent powder

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Embodiment 1

[0023] Embodiment 1, preparation SrAl 2 o 4 :Eu 0.02 , Dy 0.02 Green long afterglow phosphor

[0024] The number of moles of raw materials used is as follows:

[0025] Strontium carbonate 33.17,

[0026] Aluminum hydroxide 66.34,

[0027] Europium oxide 0.34,

[0028] Dysprosium oxide 0.33.

[0029] Its preparation steps are as follows:

[0030] 1) In a pressure vessel, aluminum hydroxide is dissolved in excess hot nitric acid to make a nitrate solution; in a heating and stirring device, strontium carbonate, europium oxide and dysprosium oxide are dissolved in hot concentrated nitric acid to make a nitrate solution; Mix the two solutions evenly to obtain a mixed solution, then adjust the pH value to 4 with ammonia water, add polyethylene glycol with a total mass of phosphor powder of 200%, and stir at a constant temperature of 80° C. for 1.5 hours to form a gel;

[0031] 2) Heating the gel at 900°C for 1.5 hours to obtain a solid-phase calcined product;

[0032] 3) A...

Embodiment 2

[0035] Embodiment 2, prepare the SrAl of different powder size 2 o 4 :Eu, Dy green long afterglow phosphor

[0036] The molar percentages of raw materials used are as follows:

[0037] Strontium carbonate 33.17,

[0038] Aluminum hydroxide 66.34,

[0039] Europium oxide 0.34,

[0040] Dysprosium oxide 0.33.

[0041] Its preparation steps are as follows:

[0042] 1) In a pressure vessel, aluminum hydroxide is dissolved in excess hot nitric acid to make a nitrate solution; in a heating and stirring device, strontium carbonate, europium oxide and dysprosium oxide are dissolved in hot concentrated nitric acid to make a nitrate solution; Mix the two solutions evenly to obtain a mixed solution, then adjust the pH value to 4 with ammonia water, add citric acid with 150% of the total mass of the phosphor powder, and stir at a constant temperature of 80° C. for 1.5 hours to form a gel;

[0043] 2) Heating the gel at 900°C for 1.5 hours to obtain a solid-phase calcined product; ...

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Abstract

The present invention discloses process of preparing RE excited long afterglow strontium aluminate fluorescent powder. The process includes the following steps: 1. preparing mixed solution of strontium nitrate, aluminum nitrate and lanthanide RE nitrate in the molar ratio of 29.6-39.5 to 59.2-69.2 to 0.65-1.8, regulating the pH value of solution to 2-8, and adding sol forming agent through stirring at 80-120 deg.c for 1-24 to form sol; 2. heating the sol at 300-900 deg.c for 1.5-30 hr to obtain solid pre-baked matter; and 3. grinding the solid pre-baked matter, adding inorganic salt, igniting at 800-1400 deg.c in reducing atmosphere, and washing to obtain the RE excited long afterglow strontium aluminate fluorescent powder. The present invention has simple technological process, high product performance and important industrial application value.

Description

technical field [0001] The invention relates to a method for preparing rare earth activated strontium aluminate long afterglow fluorescent powder. Background technique [0002] Rare earth luminescent materials have become supporting materials in information display, lighting sources, optoelectronic devices and other fields. The high luminous intensity, good microscopic morphology and suitable particle size of phosphors can not only expand its application field, but also effectively improve the performance of devices . Rare earth-activated strontium aluminate long-lasting phosphor is an important luminescent material, which has been widely used in concealed lighting and emergency lighting facilities, aviation, marine and automotive dashboards, industrial art, coatings, luminescent inks and other fields. In practical applications, the luminous performance of the long-lasting phosphor (including the type of excitation source and excitation efficiency), the afterglow performanc...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 余泉茂荆西平孙昕
Owner PEKING UNIV
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