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Fluorescent powder preparation method based on polyethylene glycol and with ethanol as solvent

A polyethylene glycol and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor particle size uniformity, poor dispersion of phosphor powder, agglomeration, etc., and achieve improved luminous intensity, convenient operation, and improved dispersion. sexual effect

Inactive Publication Date: 2015-07-01
LONGTENG LIGHTING GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technical solutions have the problems of easy agglomeration, poor dispersion of phosphor powder and poor uniformity of particle size.

Method used

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  • Fluorescent powder preparation method based on polyethylene glycol and with ethanol as solvent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Accurately weigh 7.5027g Al(NO 3 ) 3 9H 2 O, 0.2681g Sr(NO 3 ) 2 , 0.1655g Ba(NO 3 ) 2 , 0.5128g Mg(NO 3 ) 2 ·6H 2 O, 0.0176g Eu 2 o 3 ; Press nitrate (0.024mol): urea is to add urea in the molar ratio of 1:1.5 again, press nitrate (0.024mol): boric acid is to add boric acid in the molar ratio of 100:1, press concentrated nitric acid: Sr x Ba y Ca 1-x-y Mg z Zn 1-z al 10 o 17 :Eu 2+ (0.002mol) added concentrated nitric acid in a molar ratio of 5:1, according to absolute ethanol:Sr x Ba y Ca 1-x-y Mg z Zn 1-z al 10 o 17 :Eu 2+ (0.002mol) is added absolute ethanol at a molar ratio of 8:1, and the amount of polyethylene glycol added is 0.5% by mass percent of the total mass of nitrates. Will Eu 2 o 3 Dissolve in concentrated nitric acid (mass fraction 65%), then add absolute ethanol, then add polyethylene glycol (number average molecular weight 1200) to adjust the pH to 10, then add the required nitrate to obtain a transparent solution, then add ...

Embodiment 2

[0033] Accurately weigh 7.5027g Al(NO 3 ) 3 9H 2 O, 0.3217g Sr(NO 3 ) 2 , 0.0993g Ba(NO 3 ) 2 , 0.5128g Mg(NO 3 ) 2 ·6H 2 O, 0.0176g Eu 2 o 3 ,; Add urea again by nitrate (0.024mol): urea is 1:1.5 molar ratio, by nitrate (0.024mol): boric acid is 100:1 molar ratio to add boric acid, press concentrated nitric acid: Sr x Ba y Ca 1-x-y Mg z Zn 1-z al 10 o 17 :Eu 2+ (0.002mol) added concentrated nitric acid in a molar ratio of 5:1, according to absolute ethanol:Sr x Ba y Ca 1-x-y Mg z Zn 1-z al 10 o 17 :Eu 2+ (0.002mol) is added absolute ethanol at a molar ratio of 8:1, and the addition amount of polyethylene glycol is 0.5% by mass percentage. Will Eu 2 o 3 Dissolve in concentrated nitric acid (mass fraction 65%), then add absolute ethanol, then add polyethylene glycol (number average molecular weight 1200) to adjust the pH to 10, then add the required nitrate to obtain a transparent solution, then add boric acid and urea Stir continuously to obtain the...

Embodiment 3

[0035] Accurately weigh 7.5027g Al(NO 3 ) 3 9H 2 O, 0.1340g Sr(NO 3 ) 2 , 0.3310g Ba(NO 3 ) 2 , 0.5128g Mg(NO 3 ) 2 ·6H 2 O, 0.0176g Eu 2 o 3 ,; Add urea again by nitrate (0.024mol): urea is 1:1.5 molar ratio, by nitrate (0.024mol): boric acid is 100:1 molar ratio to add boric acid, press concentrated nitric acid: Sr x Ba y Ca 1-x-y Mg z Zn 1-z al 10 o 17 :Eu 2+ (0.002mol) added concentrated nitric acid in a molar ratio of 5:1, according to absolute ethanol:Sr x Ba y Ca 1-x-y Mg z Zn 1-z al 10 o 17 :Eu 2+ (0.002mol) is added absolute ethanol at a molar ratio of 8:1, and the addition amount of polyethylene glycol is 0.5% by mass percentage. Will Eu 2 o 3 Dissolve in concentrated nitric acid (mass fraction 65%), then add absolute ethanol, then add polyethylene glycol (number average molecular weight 1200) to adjust the pH to 10, then add the required nitrate to obtain a transparent solution, then add boric acid and urea Stir continuously to obtain the...

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Abstract

The invention discloses a fluorescent powder preparation method based on polyethylene glycol and with ethanol as solvent, and belongs to the field of preparation of fluorescent powder. By utilizing sol gel combustion method, with polyethylene glycol (PEG) as dispersing agent, absolute ethyl alcohol as solvent and incendiary agent, urea as complexing agent and reducing agent, and nitrate as oxidant, through introducing fluxing agent boric acid, dissolving into absolute ethyl alcohol together with metal nitrate, heating in a water bath to form sol, cooling to obtain white gel, then heating the gel in a Muffle furnace until the gel burns spontaneously to form fluffy powder, cooling and grinding, so as to obtain fluorescent powder. The method is simple in process, free in pollution, low in synthesis temperature, short in reaction time, low in cost, low in energy consumption and high in quenching concentration; by utilizing surface dispersing agent PEG and solvent ethyl alcohol, the products are prevented from gathering, the dispersion property of the fluorescent powder and the evenness of particle size are improved, the fluorescent powder has excellent light emitting strength, and therefore the prepared fluorescent powder is better applicable for LED (light emitting diode) products.

Description

technical field [0001] The invention relates to the field of fluorescent powder preparation, in particular to a method for preparing fluorescent powder based on polyethylene glycol and using ethanol as a solvent. Background technique [0002] White Light Emitting Diode (WLED for short), as a new type of solid light source, has the advantages of high efficiency, energy saving, long life, no radiation, green environmental protection, high light efficiency, and large safety factor. And backlight and other aspects show great application prospects. At present, the high-temperature solid-phase method is mainly used for the preparation of fluorescent powder. This method has many advantages, but the particle size of the synthesized fluorescent powder is relatively coarse and uneven, and it can be used only after ball milling. However, the crystal form of the ball-milled particles is destroyed, and the indicators such as luminous brightness, luminous efficiency and secondary perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 王乐金尚忠夏国飞张宏陈如标
Owner LONGTENG LIGHTING GRP
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