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Green phosphor of spherical RE phosphate and its prepn

A technology of rare earth phosphate and green fluorescent powder, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of small fluorescent powder, and achieve the effect of regular particle shape, uniform size distribution, and good optical performance

Inactive Publication Date: 2004-04-07
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the (La, Ce, Tb)PO prepared by this method 4 The particle size of the phosphor is too small, only 0.05-1μm

Method used

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  • Green phosphor of spherical RE phosphate and its prepn
  • Green phosphor of spherical RE phosphate and its prepn
  • Green phosphor of spherical RE phosphate and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 65.16g La 2 o 3 , 68.84 CeO 2 , 37.38 Tb 4 o 7 , dissolved in hot 65% concentrated H3NO 3 250ml, add 20ml 35% H 2 o 2 , so that Ce 4+ All converted to Ce 3+ . Heat until clear, then dilute to one liter. The mixed rare earth concentration is 1mol / l. Another weighed (NH 4 ) 2 HPO 4 145.26g, dissolved and diluted to one liter, (NH 4 ) 2 HPO 4 The concentration of the solution is 1.1mol / l, the base solution is 100ml deionized water, and 3g of citric acid is added. Add the mixed rare earth nitrate and diammonium hydrogen phosphate solution into the bottom liquid in parallel, stir, and control the reaction temperature to 8°C and pH to 2.5. After the addition, the solution was aged at 50° C. for 10 h, and 2 ml of 3% PVA solution was added during the aging period. The precipitate was filtered, washed and dried. Add Li to the above mixed rare earth phosphate powder 2 CO 3 2.0g, H 3 BO 3 62g, mix well, and pretreat at 900°C for 2 hours. Cool, then...

Embodiment 2

[0041] Weigh 65.16g La 2 o 3 , 68.84 CeO 2 , 37.38 Tb 4 o 7 , dissolved in hot 65% concentrated H 3 NO 3 250ml, add 20ml 35% H 2 o 2 , so that Ce 4+ All converted to Ce 3+ . Heat until clear, then dilute to one liter. The mixed rare earth concentration is 1mol / l. Another weighed (NH 4 ) 2 HPO 4 145.26g, dissolved and diluted to one liter, (NH 4 ) 2 HPO 4 The concentration of the solution is 1.1mol / l, the base solution is 100ml deionized water, and 3g of citric acid is added. Add the mixed rare earth nitrate and diammonium hydrogen phosphate solution into the bottom liquid in parallel, stir, and control the reaction temperature to 15°C and pH to 3.0. After the addition, the solution was aged at 60° C. for 5 h, and 2 ml of 3% PVA solution was added during the aging. The precipitate was filtered, washed and dried. Add Li to the above mixed rare earth phosphate powder 2 CO 3 2.0g, H 3 BO 3 83g, mix well, and pretreat at 900°C for 2 hours. Cool, and then...

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Abstract

The present invention is green phosphor of spherical RE phosphater and its preparation process. The green phosphor has chemical molecular expression of (Lax, Cey, Tbz) PO4, and is one kind of spherical crystal with particle size of 2-10 microns and central particle size D50 of 3-6 microns. the green phosphor of spherical RE phosphate may be prepared via liquid phase precipitation process. It has regular particle shape, homogeneous size distribution, better performance and simple preparation process.

Description

technical field [0001] The invention relates to a preparation method of a rare earth phosphate green fluorescent powder, in particular to a preparation method of a spherical rare earth phosphate green fluorescent powder. Background technique [0002] Rare earth phosphate ((La, Ce, Tb)PO 4 ) is a kind of green fluorescent powder in the commercial three-color fluorescent powder, which emits green fluorescence at about 550nm under the excitation of ultraviolet light. Because of its high quantum efficiency and high temperature resistance, it is widely used in fluorescent lamps and PDP displays as a green component. However, more and more studies have shown that the particle characteristics of phosphors, such as morphology, particle size, and particle distribution, have an impact on luminous intensity, efficiency, and resolution. Spherical phosphor has the advantages of high filling density, good coating, and relatively stable light intensity distribution, so that its luminous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
Inventor 徐志珍杨云霞方斌沈永嘉
Owner EAST CHINA UNIV OF SCI & TECH
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