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Blue fluosilicate fluorescent powder as well as preparation method and application

A blue phosphor, fluorosilicate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as explosion, production limitation, affecting the luminescence of phosphors, and achieve a simple preparation process and easy operation. , the effect of wide application prospects

Active Publication Date: 2014-07-16
扬州科丰高新产业投资开发集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this type of phosphor needs to be in H 2 +N 2 Synthesized in a reducing atmosphere, during the synthesis process H 2 +N 2 It is impossible for the reducing gas to completely penetrate into the synthetic phosphor powder, so that the activated ions of the phosphor cannot be fully reduced to Ce 3+ , which seriously affects the luminescence of the phosphor; also due to the H 2 +N 2 Reducing gas is dangerous, improper operation can cause explosion, therefore, its production is subject to certain restrictions

Method used

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  • Blue fluosilicate fluorescent powder as well as preparation method and application
  • Blue fluosilicate fluorescent powder as well as preparation method and application
  • Blue fluosilicate fluorescent powder as well as preparation method and application

Examples

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Effect test

Embodiment 1

[0027] Preparation of Ca 1.998 Eu 0.002 NaSi 4 O 10 F

[0028] According to the chemical formula Ca 1.998 Eu 0.002 NaSi 4 O 10 The stoichiometric ratio of each element in F is respectively weighed as calcium carbonate CaCO 3 :0.999g, Europium oxide Eu 2 O 3 :0.004g, silicon dioxide SiO 2 :2.404g, after grinding and mixing uniformly in an agate mortar, select air atmosphere for the first calcination, temperature is 500℃, calcination time is 3 hours, then cool to room temperature, take out the sample; fully calcine the raw materials again Mix and grind uniformly, sinter again in reducing atmosphere (buried in activated carbon powder), temperature 700 ℃, calcination time 7 hours, then cool to room temperature, take out the sample; finally add sodium fluoride NaF: 0.420 g, calcium fluoride CaF 2 :0.281g. After being fully ground again, it is sintered in a reducing atmosphere in a muffle furnace at a calcination temperature of 1000°C and a calcination time of 10 hours to obtain a powder...

Embodiment 2

[0034] Preparation of Ca 1.98 Eu 0.02 NaSi 4 O 10 F

[0035] According to the chemical formula Ca 1.98 Eu 0.02 NaSi 4 O 10 The stoichiometric ratio of each element in F is respectively weighed as calcium oxide CaO: 0.550 g, europium nitrate Eu(NO 3 ) 3 :0.068g, silicon dioxide SiO 2 :2.404g, sodium oxide Na 2 O: 0.310g, after grinding and mixing in an agate mortar, select air atmosphere for the first calcination, temperature is 300℃, calcination time 8 hours, then cool to room temperature, take out the sample; take the first calcination material again Mix thoroughly and grind uniformly, sinter again in a reducing atmosphere (buried in activated carbon powder) at a temperature of 1000°C, calcination time 4 hours, then cool to room temperature, take out the sample; finally add calcium fluoride CaF 2 : 0.281g, fully ground again and sinter it in a reducing atmosphere in a muffle furnace at a calcination temperature of 1200°C and a calcination time of 5 hours to obtain a powdery fluoro...

Embodiment 3

[0037] Preparation of Ca 1.9 Eu 0.1 NaSi 4 O 10 F

[0038] According to the chemical formula Ca 1.9 Eu 0.1 NaSi 4 O 10 The stoichiometric ratio of each element in F is respectively weighed as calcium carbonate CaCO 3 :0.901g, Europium Oxide Eu 2 O 3 :0.176 g, silicon dioxide SiO 2 :2.404g, after grinding and mixing uniformly in an agate mortar, select air atmosphere for the first calcination, temperature is 400℃, calcination time is 6 hours, then cool to room temperature, take out the sample; fully calcine the raw materials for the first time Mix and grind uniformly, sinter again in a reducing atmosphere (buried in activated carbon powder), temperature 800 ℃, calcination time 5 hours, then cool to room temperature, take out the sample; finally add sodium fluoride NaF: 0.420 g, calcium fluoride CaF 2 :0.281g, fully ground again and sinter it in a reducing atmosphere in a muffle furnace at a calcination temperature of 1050°C and a calcination time of 9 hours to obtain a powdery fluor...

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Abstract

The invention discloses a blue fluosilicate fluorescent powder as well as a preparation method and application thereof, belonging to the technical field of an inorganic luminescent material. The chemical formula of the fluorescent powder is Ca[2-2x]Eu2xNaSi4O10F, wherein x is larger than 0.0001 and smaller than or equal to 0.25, and the fluorescent powder is prepared by adopting high temperature solid state method. The fluorescent powder transmits blue fluorescence with a central wavelength close to 450 nm under excitation of ultraviolet light with a wavelength of 350-420 nm, and has high luminescent intensity and good stability; by excitation of near ultraviolet light, the wavelength of the fluorescent powder is highly engaged with the transmission wavelength of a near ultraviolet semiconductor chip, so the fluorescent powder can be used as fluorescent powder for white light LED excited by near ultraviolet light. Moreover, the fluorescent powder contains alkaline-earth metals and rare-earth metals as main positive ions, is simple in sintering process and has good reproducibility; the product obtained has stable quality; and the preparation method is beneficial to operation and industrial production.

Description

Technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a high-brightness blue 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] With the increasing shortage of global energy and increasing environmental pressure, energy conservation and environmental protection have become an important topic currently facing. In the field of general lighting, white LED products are attracting more and more attention. As a new type of green lighting product, white LED has the advantages of high photoelectric efficiency, long life, small size, low power, solid-state energy saving and green environmental protection. It is a recognized new type of lighting source and will inevitably become the future development trend. The 21st century will enter the era of new lighting sources represented by LEDs. P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/86H01L33/50
Inventor 黄彦林陶正旭秦琳关莹魏东磊
Owner 扬州科丰高新产业投资开发集团有限公司