Spherical terbium doped tungstate green phosphor and preparation thereof

A technology of green fluorescent powder and tungstate, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of irregular particle shape, uneven size distribution, and degradation of phosphor performance, so as to facilitate lighting and lighting. Color rendering, easy to promote and use, and not easy to be damaged by radiation

Inactive Publication Date: 2009-07-22
LONGNAN JINGLI NONFERROUS METAL CO LTD
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Problems solved by technology

However, the phosphor powder prepared by the solid phase method must go through a ball milling process, resulting in irregular particle shape and uneven size distribution, which deteriorates the performance of the phosphor powder.
In addition, the process of preparing Ce and Tb co-doped green phosphors by solid-state reaction has high reaction temperature, high energy consumption, and reducing atmosphere and Ce and Tb co-doped lead to high cost

Method used

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  • Spherical terbium doped tungstate green phosphor and preparation thereof
  • Spherical terbium doped tungstate green phosphor and preparation thereof
  • Spherical terbium doped tungstate green phosphor and preparation thereof

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Embodiment 1

[0025] Embodiment 1: adopt hydrothermal method to synthesize Tb 3+ doped CaWO 4 Phosphor. Weigh 1.1215gTb 4 o 7 Dissolve in 1.3ml of hot 65% concentrated nitric acid, and then dilute to 50ml to form 0.12mol / l terbium nitrate solution. Another 52.54g of citric acid and 8.974g of calcium nitrate were weighed and dissolved in 240ml of deionized water, and then the terbium nitrate solution obtained above was added and stirred continuously for 30 minutes. Weigh 16.492g Na 2 WO 4 2H 2 O was dissolved in deionized water with constant stirring. Then add the sodium tungstate solution dropwise into the above mixed solution, and keep stirring for 60 minutes, so that the rare earth ions and barium ions fully react with the tungstate ions. Then transfer the precipitate and the solution into a hydrothermal reaction kettle, heat it at 180°C for 12 hours, then cool it to room temperature, wash it with alcohol and deionized water three times, centrifuge to obtain a white precipitate an...

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Abstract

The invention relates to spherical terbium doped tungstate green phosphor powder and a preparation method thereof; the phosphor powder is spherical crystal; the particle size distribution is 1 to 5 mum, and the center particle diameter D50 is 3 to 4 mu m; and the chemical molecular formula is R1-2x(Tb, Na)2xWO4, wherein, R is one of Ca, Sr and Ba, and x equals to 0.01 to 0.2. The Tb3+ doped alkaline earth tungstate green phosphor power obtained by adopting the invention is nanometer crystal; the particles have regular shape, even size distribution, good phosphor powder optical property and stable physical and chemical properties; under the excitation of the ultraviolet ray, X-ray and energetic particles, the Tb3+ doped alkaline earth tungstate green phosphor power can achieve visible light emission when the wavelength is 545nm, and realize high energy conversion; besides, the emission wavelength is conducive to lighting and color and positioned on the sensitive response wave band of CCD simultaneously; and the spherical terbium doped tungstate green phosphor powder and the preparation method thereof have wide application prospects in the fields such as lighting, plasma flat-panel display, etc.

Description

Technical field [0001] The invention relates to a spherical terbium-doped tungstate green fluorescent powder and a preparation method thereof. Background technique [0002] In the application of various display materials, especially the three primary color phosphors used in lamps, green phosphors are the key. It plays a major role in the luminous efficacy and lumen maintenance of the lamp. At present, the green phosphors produced and researched at home and abroad are mainly divided into three major systems: phosphate-based phosphors, borate-based phosphors and aluminate-based phosphors. Among them, phosphate green phosphor has the advantages of high light efficiency, low synthesis temperature, and moderate particle size, but poor thermal stability; borate green phosphor has the advantages of high efficiency, low sintering temperature, and easy synthesis, but the sintering temperature range is very narrow. , easy to agglomerate; aluminate green phosphor has the advantages o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 廖金生温和瑞游维雄邱报
Owner LONGNAN JINGLI NONFERROUS METAL CO LTD
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