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Method for preparing white light fluorescent powder used for near ultraviolet LED

A phosphor and near-ultraviolet technology, applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps, can solve problems such as lumen efficiency and color reproduction effects, and achieve mild experimental conditions, good reproducibility, Simple and easy method

Inactive Publication Date: 2008-03-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems of color reabsorption and ratio control between mixed phosphors, which greatly affect lumen efficiency and color reproduction

Method used

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  • Method for preparing white light fluorescent powder used for near ultraviolet LED

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.363 g of gadolinium oxide and 0.007 g of europium oxide as an activator, dissolve them in 5 ml of concentrated nitric acid and heat until evaporated to dryness, then dissolve the obtained rare earth nitrate with deionized water to obtain a rare earth nitrate solution. With 0.330 gram of sodium tungstate dihydrate and reaction raw material (0.363 gram of Gd 2 o 3 , 0.007 g Eu 2 o 3 , 0.330 g Na 2 WO 4 2H 2 O) 20 wt% surfactant cetyltrimethylammonium bromide (CTAB) was dissolved in deionized water to obtain a sodium tungstate solution. Mix the obtained rare earth nitrate solution with sodium tungstate solution, and perform magnetic stirring to produce a white precipitate. Control the stirring time for 30 minutes to obtain a white precipitate; transfer the solution containing the precipitate into a 25ml polytetrafluoroethylene reaction kettle, After hydrothermal reaction at 170°C for 48 hours, the reaction product was cooled to room temperature, centrifuged, ...

Embodiment 2

[0024] Weigh 0.398 g of lutetium oxide and 0.007 g of europium oxide as an activator, dissolve them in 5 ml of concentrated nitric acid and heat until evaporated to dryness, then dissolve the obtained rare earth nitrate with 5 ml of deionized water to obtain a rare earth nitrate solution. With 0.326 gram potassium tungstate and be reaction raw material (the Lu that takes by weighing as above 2 o 3 , Eu 2 o 3 , K 2 WO 4 Grams) 18wt% surfactant cetyltrimethylammonium bromide (CTAB) was dissolved in 5ml deionized water to obtain potassium tungstate solution. Mix the rare earth nitrate and potassium tungstate solution, and stir magnetically to produce a white precipitate. The stirring time is 60 minutes, transfer it to a 25ml polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 120°C for 60 hours. The reaction product is cooled to After room temperature, centrifuge and wash three times with deionized water. Then dry at 70°C for 30 hours to obtain the desir...

Embodiment 3

[0026] Weigh 0.326 g of lanthanum oxide and 0.007 g of europium oxide as an activator, dissolve them in 5 ml of concentrated nitric acid and heat until evaporated to dryness, then dissolve the obtained rare earth nitrate with 5 ml of deionized water to obtain a rare earth nitrate solution. 0.330 gram of sodium tungstate dihydrate and 20wt% surfactant block copolymer (ethylene oxide-propylene oxide-butylene oxide) for reaction raw material (solid raw material as weighed above) are dissolved in deionized In water, sodium tungstate solution was obtained. Mix the obtained rare earth nitrate solution and sodium tungstate solution, stir magnetically to produce a white precipitate, stir magnetically for 40 minutes, transfer it to a 25ml polytetrafluoroethylene reactor at 180°C for hydrothermal reaction for 72 hours, and wait for the reaction product to cool to room temperature , centrifuged and washed three times with deionized water. Then dry at 70°C for 20 hours to obtain the desi...

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Abstract

The present invention belongs to the field of inorganic synthesis of optical functional material, and is especially the preparation process of white light phosphor powder for near ultraviolet LED. The preparation process includes the following steps: dissolving activator and RE oxide in the molar ratio of 0.01-0.02 in concentrated nitric acid and heating to dry, dissolving the obtain RE nitrate in deionized water to obtain solution of RE nitrate; dissolving soluble tungstate and surfactant in deionized water to obtain tungstate solution; mixing the RE nitrate solution and the tungstate solution through stirring to reaction for 25-60 min to obtain white precipitate; hydrothermal reaction of the precipitate in a reaction kettle at 100-260 deg.c for 24-72 hr; centrifugally separating, washing and drying to obtain the product. The process is simple, and has mild reaction condition and high repeatability.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis of optical functional materials, and in particular relates to a preparation method of white phosphor powder for near-ultraviolet LEDs. Background technique [0002] In recent years, due to its high-efficiency and energy-saving features, solid-state lighting light-emitting diodes (LEDs) have been increasingly used in daily life, such as background lighting, traffic lights, full-color displays, and general lighting. It will become the lighting source of the 21st century. major innovations. LED will become the fourth-generation lighting source after the first-generation light source incandescent lamp, the second-generation light source fluorescent lamp, and the third-generation light source high-intensity gas discharge lamp. At present, commercial white light LEDs use blue-light InGaN tube cores to excite YAG:Ce 3+ Yellow phosphor, yellow and blue light mixed to get white light. There a...

Claims

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Application Information

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IPC IPC(8): C09K11/77H01L33/00
CPCY02B20/181Y02B20/00
Inventor 闫冰雷芳
Owner TONGJI UNIV
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