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Fluorosilicate fluorescent powder and preparation method thereof

A technology of fluorosilicate and fluorescent powder, which is applied in the field of rare earth luminescent materials, can solve the problems of poor color rendering, unstable performance, and low efficiency, and achieve the effects of stable physical and chemical properties, simple synthesis method, and easy operation

Inactive Publication Date: 2012-10-03
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial products are mainly single-chip high-brightness white LEDs composed of blue LED chips and yellow light of YAG phosphor powder. resulting in poor color rendering
However, in the prior art, the luminous efficiency of phosphors excited by purple light or ultraviolet light is not high
Therefore, the white LEDs packaged in the prior art have low color rendering index or low efficiency or unstable performance.

Method used

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  • Fluorosilicate fluorescent powder and preparation method thereof
  • Fluorosilicate fluorescent powder and preparation method thereof
  • Fluorosilicate fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: take by weighing CaCO 3 4.9949g, SiO 2 1.5068g, LiF 0.6505g, Eu 2 o 3 0.0441g, the purity of the above raw materials is analytically pure, after mixing and grinding the weighed raw materials evenly, put them into an alumina crucible, place them in a tube furnace, and pass in H 2 / N 2 =5% / 95% reducing atmosphere, heat up to 600°C, keep warm for 3 hours, then quickly raise the temperature to 850°C, and keep warm at 850°C for 4 hours. After natural cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get Ca 1.98 LiSiO 4 F:0.01Eu 2+ sample. Excitation spectrum (λem=565 nm) and emission spectrum (λex=370 nm) of the sample are shown in figure 1 .

Embodiment 2

[0025] Embodiment 2: take by weighing CaCO 3 6.5248g, SiO 2 2.867g, LiF 1.2378g, Eu 2 o 3 0.7977g, the purity of the above raw materials is analytically pure, after mixing and grinding the weighed raw materials evenly, put them into an alumina crucible, place them in a tube furnace, and pass in H 2 / N 2 =5% / 95% reducing atmosphere, heat up to 600°C, keep warm for 3 hours, then quickly raise the temperature to 850°C, and keep warm at 850°C for 4 hours. After natural cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get Ca 1.905 LiSiO 4 F:0.095Eu 2+ sample.

Embodiment 3

[0026] Embodiment 3: take by weighing CaC 2 o 4 12.4004g, SiO 2 3.0136g, LiF 1.2942g, Li 2 CO 3 0.0544g, Ce(NO 3 ) 3 0.4882g, the purity of the above raw materials is analytically pure, after mixing and grinding the weighed raw materials evenly, put them into an alumina crucible, place them in a tube furnace, and pass in H 2 / N 2 =5% / 95% reducing atmosphere, slowly raise the temperature to 600°C, keep the temperature for 2 hours, then rapidly raise the temperature to 850°C, and keep the temperature at 850°C for 3 hours. After natural cooling, take it out and crush it, grind it, wash it with water to remove impurities, and dry it to get Ca 1.94 LiSiO 4 F:0.03(Ce 3+ +Li + )sample. Excitation spectrum (λem=460 nm) and emission spectrum (λex=370 nm) of the sample are shown in figure 2 .

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Abstract

The invention discloses fluorosilicate fluorescent powder, which is rare earth ion-activated calcium fluorine lithium silicate fluorescent powder. The chemical expression formula of the fluorosilicate fluorescent powder is Ca(2-x)LiSiO4F:xR<2+>, wherein x is more than 0 and less than 0.1 and R<2+> is Eu<2+>, or C2(2-2x)LiSiO4F:x(R<3+>+Li<+>, x is more than 0 and less than 0.5, R<3+> is one of Eu<3+>, Sm<3+>, Tb<3+>, Dy<3+> and Ce<3+>. The invention also discloses a preparation method for the fluorosilicate fluorescent powder. The fluorescent powder can emit visible light under the excitation of 300-500nm light and can be independently or matched with other fluorescent powder to coating blue light, purple light or ultraviolet light LEDs (Light Emitting Diodes) to obtain a novel white light LED. The fluorosilicate fluorescent powder can also be matched with the purple light or ultraviolet light LED or mixed with other types of fluorescent powder to obtain a colored LED in bright colors.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a fluorosilicate fluorescent powder suitable for LEDs and a preparation method thereof, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] In the 1990s, with the technological breakthrough of high-brightness GaN blue LEDs, a blue LED and YAG phosphor ((Y, Gd) appeared in 1996. 3 al 5 o 12 : Ce 3+ ) combined white light LED, which is considered to be another leap in the history of human lighting after incandescent lamps and fluorescent lamps, and is one of the most promising high-tech fields in the 21st century. At present, the commercial products are mainly single-chip high-brightness white LEDs composed of blue LED chips and yellow light of YAG phosphor powder. resulting in poor color rendering. In addition, the yellow YAG phosphor cannot be effectively excited by 360-420 nm long-wave ultraviolet to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61
CPCY02B20/181Y02B20/00
Inventor 黄立辉徐时清华有杰邓德刚赵士龙王焕平夹国华
Owner CHINA JILIANG UNIV