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Stable aluminate-based phosphor powder, preparing method and application thereof

A technology of phosphor and aluminate, applied in the field of phosphor and preparation, can solve the problem of chemical stability of blue phosphor without barium magnesium aluminate base, and achieves suitable for large-scale industrial production, high luminous efficiency and stability , the effect of low cost

Inactive Publication Date: 2009-10-21
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method does not essentially realize the chemical stability of the barium magnesium aluminate-based blue phosphor, and there are still many defects.

Method used

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  • Stable aluminate-based phosphor powder, preparing method and application thereof
  • Stable aluminate-based phosphor powder, preparing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] According to the chemical formula Eu x Ba 1-x MgAl 10-y Si y o 17-y N y , take x=0.12, y=0.03, weigh BaCO 3 0.88mol, Al 2 o 3 4.97mol, MgO 1.00mol, AlN 0.03mol, SiO 2 0.03mol, Eu 2 o 3 0.06mol, put these raw materials together into a ball mill tank, add 50 ml of absolute ethanol at the same time, ball mill on a planetary ball mill for 10 hours, mix well, dry, and pass the obtained powder through a 500 μm sieve to make it fall freely into boron nitride In the crucible, the stacking relative density is about 30%, then cover the non-sealed top cover, put it into a vacuum carbon tube furnace, and then firstly evacuate it through a diffusion pump, and heat it from room temperature to 800 °C at a speed of 500 °C per hour, 800 ℃ by introducing nitrogen with a purity of 99.99%, then raising the temperature to 1500 ℃ at a rate of 500 ℃ per hour, and keeping it warm for 2 hours, then turn off the power, and cool naturally to room temperature before taking it out.

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Embodiment 2

[0056] According to the chemical formula Eu x Ba 1-x MgAl 10-y Si y o 17-y N y , take x=0.10, y=0.50, weigh BaCO 3 0.90mol, Al(OH) 3 9.00mol, MgO 1.00mol, AlN 0.50mol, SiO 2 0.50mol, Eu 2 o 3 0.05mol, put these raw materials together into a ball mill jar, add 50ml of absolute ethanol at the same time, ball mill on a planetary ball mill for 10 hours, mix well, dry, and pass the obtained powder through a 500μm sieve to make it fall freely into an alumina crucible Inside, the stacked relative density is about 30%, then cover the non-sealed top cover, put it into the corundum tube furnace, firstly evacuate it through the diffusion pump, and then pass the flowing N with a purity of 99.99% 2 / NH 3 (Its volume ratio is 5: 1) the mixed gas is heated up to 1400°C at a heating rate of 3°C / min, and after 10 hours of heat preservation, it is cooled naturally at a cooling rate of 5°C / min to 800°C. The burned product is crushed, then ball-milled to form a powder slurry, washe...

Embodiment 3

[0060] According to the chemical formula Eu x f 1 1-x f 2 al 10-y Si y o 17-y N y , take F1 = Ba and Ca, F 2 =Mg, x=0.12, y=1.50, weigh BaCO 3 0.86mol, CaCO 3 0.02mol, Al 2 o 3 4.25mol, MgCO 3 1.00mol, Si 3 N 4 0.375mol, SiO 2 0.375mol, Eu 2 o 3 0.06mol, other conditions are the same as in Example 2, and the temperature is raised to 1450° C. at a heating rate of 2° C. / min. After 6 hours of heat preservation, it is naturally cooled to 800° C. at a cooling rate of 5° C. / min. The burning product is crushed, then ball milled to form a powder slurry, washed with deionized water until neutral, dehydrated, dried, and sieved to obtain a highly stable barium magnesium aluminate-based blue phosphor. According to the same method as in Example 1, compare the heat treatment stability of SiNBAM and BAM provided in this experiment. Compared with the corresponding pure BAM, its luminous efficiency before and after heat treatment was increased by 6% and 19%, respectivel...

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Abstract

The invention provides aluminate-based phosphor powder, the composition of which is represented by the following general formula: EuxF1-xFAl10-ySiyO17-yNy, wherein F is at least one element of Ba, Sr and Ca, and F is Mg and / or Zn; the coefficients x and y are atom mole numbers, in the formula, x is more than 0 and less than 0.60, and y is more than 0 and less than 5.50. As Al-O bonds are replaced by part Si-N bonds in the phosphor powder, the stability thereof can be improved effectively, and the phosphor powder has the advantages of high luminous brightness and good stability. The invention also provides a method for improving the luminous efficiency and stability of the phosphor powder. In the method, mixture of compounds containing nitrogen and compounds containing silicon or mixture of silica powder and nitrogen is added to corresponding matrix to ensure the Si-N bonds to replace the Al-O bonds. The invention also provides the application of the aluminate-based phosphor powder.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method, in particular to an aluminate-based fluorescent powder and a preparation method thereof. Background technique [0002] In recent years, trichromatic phosphors have been widely used in the fields of lighting and image display. Among them, blue rare earth fluorescent materials can be widely used in many fields such as displays, lighting devices, coatings, and anti-counterfeiting marks. In rare earth blue fluorescent materials, rare earth europium (Eu) is usually used as a fluorescent activation source. [0003] Positive divalent europium ion (Eu 2+ ) transition produces blue fluorescence, Eu 2+ Activated barium magnesium aluminate BaMgAl 10 o 17 :Eu 2+ (BAM) is currently the blue rare earth phosphor with the best overall performance in color plasma flat panel displays and tri-primary fluorescent lamps, and it is also the most important blue rare-earth tri-primary phosphor. Due...

Claims

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Application Information

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IPC IPC(8): C09K11/80F21S2/00H01L33/00F21Y115/10
Inventor 徐鑫王义飞尹良君
Owner UNIV OF SCI & TECH OF CHINA
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