A kind of ultraviolet-blue light excited aluminate-based narrow-band green phosphor and preparation method thereof

A technology of green phosphor and blue light excitation, which is applied in the field of aluminate-based narrow-band green phosphor and its preparation, can solve the problems of restricting the application of wide color gamut backlight source, achieve great practical value and application prospect, and narrow emission peak , the effect of high color purity

Inactive Publication Date: 2020-10-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
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Problems solved by technology

[0003] At present, the industrialization level of the liquid crystal display color gamut based on the new LCD backlight has exceeded 90% of the color gamut set by the National Television Standards Committee. Among them, the half-peak width of the narrow-band fluoride red phosphor can reach about 10 nm, and Mass production has been achieved; however, the main reason for narrow-band green powder to achieve industrialization is β -SiAlON, the half peak width of the phosphor exceeds 50 nm, which limits its application in the field of wide color gamut backlight

Method used

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  • A kind of ultraviolet-blue light excited aluminate-based narrow-band green phosphor and preparation method thereof
  • A kind of ultraviolet-blue light excited aluminate-based narrow-band green phosphor and preparation method thereof
  • A kind of ultraviolet-blue light excited aluminate-based narrow-band green phosphor and preparation method thereof

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preparation example Construction

[0034] A method for preparing an aluminate-based narrow-band green fluorescent powder excited by ultraviolet-blue light, comprising the following steps:

[0035] S1. Ingredients: Weigh strontium-containing ions Sr according to the stoichiometric ratio 2+ compound, magnesium ion Mg 2+ Compounds, aluminum ions Al 3+ compounds and manganese ions Mn 2+ The compound is ground uniformly, then the co-solvent is weighed, mixed uniformly to obtain the raw material mixture, and set aside;

[0036] S2. Pre-burning: put the raw material mixture into a crucible first, then put it in a muffle furnace, and pre-fire it at 800°C for 2~5 hours to obtain an intermediate product;

[0037] S3. Roasting: Grind the pre-calcined intermediate product a second time, and then roast it to 1350~1500°C under a reducing atmosphere. The intermediate product is placed in a tube furnace and roasted for 2~10 hours. The reducing atmosphere is carbon powder or N 2 -H 2 Mix the gas to get the sample;

[0038...

Embodiment 1

[0041] The present embodiment prepares chemical formula according to the following method and is Sr (Mg 0.8 mn 0.2 ) 0.25 Al 11.5 o 18.5 Phosphor, ie x=0.2, y=0.25.

[0042] Ingredients: According to the above chemical formula Sr(Mg 0.8 mn 0.2 ) 0.25 Al 11.5 o 18.5 The stoichiometric ratio weighs 0.1476gSrCO 3 (analytical grade), 0.0194 g Mg(OH) 24MgCO 3 ·5H 2 O (analytical grade), 0.0057 g MnCO 3 (analytical pure), 0.5863 g Al 2 o 3 (99.99%), and ground evenly, another weighed BaF 2 (Analytical pure) 0.0380 g is used as a co-solvent, mixed evenly to obtain a raw material mixture;

[0043] Pre-burning: After putting the raw material mixture into the crucible, put it in a muffle furnace, and pre-fire it at 800°C for 4 hours;

[0044] Roasting: after the secondary grinding of the pre-calcined intermediate product, it is roasted in a tube furnace, in a reducing atmosphere (N 2 -H 2 Mixed gas) to 1400 ℃, the calcination time is 6h;

[0045] Post-processing: Tak...

Embodiment 2

[0048] The present embodiment prepares chemical formula according to the following method and is Sr (Mg 0.8 mn 0.2 ) 0.5 al 11 o 18 Phosphor, ie x=0.2, y=0.5.

[0049] Ingredients: According to the above chemical formula Sr(Mg 0.8 mn 0.2 ) 0.5 al 11 o 18 The stoichiometric ratio weighs 0.1476g SrCO 3 (analytical grade), 0.0389 g Mg(OH) 2 4MgCO 3 ·5H 2 O (analytical grade), 0.0115 g MnCO 3 (analytical pure), 0.5608g Al 2 o 3 (99.99%), and ground evenly, another weighed BaF 2 (Analytical pure) 0.0380 g is used as a co-solvent, mixed evenly to obtain a raw material mixture;

[0050] Pre-burning: After putting the raw material mixture into the crucible, put it in a muffle furnace, and pre-fire it at 800°C for 4 hours;

[0051] Roasting: after the secondary grinding of the pre-calcined intermediate product, it is roasted in a tube furnace, in a reducing atmosphere (N 2 -H 2 Mixed gas) to 1400 ℃, the calcination time is 6h;

[0052] Post-processing: Take out the ...

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Abstract

The invention discloses ultraviolet-blue ray excitated aluminate-base narrow-band green fluorescent powder. A chemical formula of the aluminate-base narrow-band green fluorescent powder is Sr(Mg1-xMnx)yAl12-2yO19-2y, wherein Mn is divalent, x is more than 0 and less than or equal to 0.50, and y is more than or equal to 0 and less than or equal to 1.0. The invention further discloses a preparationmethod of the ultraviolet-blue ray excitated aluminate-base narrow-band green fluorescent powder. The excitation wavelength of the fluorescent powder is 350nm-475nm in an ultraviolet-blue ray region and can be well matched with commercial ultraviolet-blue ray LED chips; the fluorescent powder is narrow in emission peak, high in color purity and excellent in heat stability and has a very wide colorrange; and the synthetic temperature is low, the synthetic process is simple, and the fluorescent powder is stable in chemical performance and pollution-free and has very high practical and application values in the field of fluorescent powder for new-generation LCD backlight sources.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to an aluminate-based narrow-band green fluorescent powder excited by ultraviolet-blue light and a preparation method thereof. Background technique [0002] In the field of display, wide color gamut, large size, and high-definition display are important development trends in this field in the future. At present, there are many ways to realize wide color gamut, such as liquid crystal display, QLED, OLED and laser display technology, etc., among which liquid crystal display technology is now available. It has formed a very complete liquid crystal display technology and industrial chain, has the greatest cost advantage, and is also the focus of development of display companies at home and abroad. In this technology, the physical and chemical properties of the phosphor, including the peak position of the emission spectrum, especially the size of its half-peak width, become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
CPCC09K11/643
Inventor 朱颖丽梁玉军刘仕琪
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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