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Method for preparing rare-earth vanadate LaVO4:Eu red fluorescent powder

A technology of red fluorescent powder and rare earth vanadate, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of particle crystal shape damage, adverse effects of fluorescent powder luminescent performance, etc., achieve fast synthesis speed, shorten preparation time, reduce The effect of energy consumption

Inactive Publication Date: 2009-12-02
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ball milling process will destroy the crystal shape of the particles, which will have an adverse effect on the luminescence performance of the phosphor, and it is easy to introduce impurities

Method used

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  • Method for preparing rare-earth vanadate LaVO4:Eu red fluorescent powder
  • Method for preparing rare-earth vanadate LaVO4:Eu red fluorescent powder
  • Method for preparing rare-earth vanadate LaVO4:Eu red fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 0.97mol of La 2 o 3 , 0.03mol of Eu 2 o 3 Dissolve with 3 mol of concentrated nitric acid to generate rare earth nitrate, and dilute with deionized water; weigh 2 mol of NH 4 VO 3 Make dilute solution, NH 4 VO 3 The solution was slowly added to the rare earth solution under magnetic stirring to obtain a yellow clear solution; then 1.5 moles of citric acid were added as a complexing agent; the pH value of the mixed solution was adjusted to 5 by combining dilute nitric acid and ammonia water; After fully stirring, pour the obtained emulsion into a polytetrafluoroethylene reactor, add deionized water to make the volume of the solution reach 80% of the reactor capacity (about 800ml); after sealing, place the reactor in a microwave oven , adjust the power to mid-range, microwave irradiation for 8 minutes; then the obtained suspension was centrifuged at high speed and the supernatant was poured off, the sediment was washed twice with deionized water, then washed with ab...

Embodiment 2

[0019] 0.96mol of La 2 o 3 , 0.04mol of Eu 2 o 3 Dissolve with 3 mol of concentrated nitric acid to generate rare earth nitrate, and dilute with deionized water; weigh 2 mol of NH 4 VO 3 Make dilute solution, NH 4 VO 3 The solution was slowly added to the rare earth solution under magnetic stirring to obtain a yellow clear solution; then 1.5 moles of citric acid were added as a complexing agent; the pH value of the mixed solution was adjusted to 6 by combining dilute nitric acid and ammonia water; After fully stirring, pour the obtained emulsion into a polytetrafluoroethylene reactor, add deionized water to make the volume of the solution reach 80% of the reactor capacity (about 800ml); after sealing, place the reactor in a microwave oven , adjust the power to mid-range, and irradiate with microwave for 9 minutes; then the obtained suspension is centrifuged at high speed and the supernatant is poured off, the sediment is washed twice with deionized water, washed with abs...

Embodiment 3

[0021] 0.95mol of La 2 o 3 , 0.05mol of Eu 2 o 3 Dissolve with 3 mol of concentrated nitric acid to generate rare earth nitrate, and dilute with deionized water; weigh 2 mol of NH 4 VO 3 Make dilute solution, NH 4 VO 3 The solution was slowly added to the rare earth solution under magnetic stirring to obtain a yellow clear solution; then 1.5 moles of citric acid were added as a complexing agent; the pH value of the mixed solution was adjusted to 7 by combining dilute nitric acid and ammonia water; After fully stirring, pour the obtained emulsion into a polytetrafluoroethylene reactor, add deionized water to make the volume of the solution reach 80% of the reactor capacity (about 800ml); after sealing, place the reactor in a microwave oven , adjust the power to mid-range, and irradiate with microwave for 10 minutes; then the obtained suspension is centrifuged at high speed and the supernatant is poured off, the sediment is washed twice with deionized water, washed with ab...

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Abstract

The invention discloses a method for preparing rare-earth vanadate LaVO4:Eu red fluorescent powder, which comprises the following steps: weighing La2O3 and Eu2O3 according to molar ratio; dissolving two oxides with concentrated nitric acid, and diluting the two oxides with deioniezed water; weighing NH4VO3 of which the mole number is two times that of rare-earth oxide to be prepared into dilute solution, and adding the dilute solution into rare-earth solution to obtain yellow clear solution; adding citric acid of which the mole number is 0.75 time that of rare-earth atoms and taken as a complexing agent into the yellow clear solution; adjusting the pH value of the mixed solution to be 5 to 7 with nitric acid and ammonia water; pouring the obtained emulsion into a polytetrafluoroethylene reaction kettle after the mixed solution is stirred, placing the reaction kettle into a microwave oven, and performing microwave irradiation for 8 to 10 minutes; and removing supernatant liquid after performing high speed centrifugation on the obtained suspension liquid, and washing and drying sediment to obtain the red fluorescent powder LaVO4:Eu. The method has the advantages of simple and convenient operation and quick synthesis. The obtained powder has the characteristics of high purity, high crystallinity, uniform particle size, and stable luminescence.

Description

technical field [0001] The invention relates to a preparation method of an inorganic luminescent material, in particular to a rare earth vanadate LaVO 4 : The preparation method of Eu red fluorescent powder. Background technique [0002] Rare earth vanadate luminescent powder is an important luminescent matrix. In the 1960s, Levine took the lead in developing the vanadate red luminescent powder - europium-activated yttrium vanadate YVO4:Eu, which was used to replace the non-rare earth red phosphor and increased the brightness by 40%. At present, vanadate luminescent materials are widely used in plasma display (PDP) and high-pressure mercury lamps. Moreover, it also has stable luminous efficiency under vacuum ultraviolet irradiation, and is a promising large-screen luminescent powder material. [0003] At present, solid state reaction is mostly used in industry to prepare rare earth vanadate luminescent powder. The powder prepared by this method has a large particle size ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/82
Inventor 杜平凡席珍强
Owner ZHEJIANG SCI-TECH UNIV
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