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Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof

A fluorescent powder and stoichiometric ratio technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of concentration quenching, red shift of luminescent wavelength, red shift, etc., and achieve the effect of convenient regulation and wide excitation range

Inactive Publication Date: 2011-04-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the content of Eu2+ can red-shift the emission wavelength, but excessive increase can easily cause concentration quenching
The second is to change the heat treatment temperature in the preparation process (J.H.Lee and Y.J.Kim, Mater.Sci.Eng.B, 2008, 146, 99), however, increasing the heat treatment temperature can only move the luminescence wavelength to a shorter wavelength, that is, only the luminescence can be achieved The blue shift of the wavelength, so there is still a lack of effective means to red shift the phosphor emission
In addition, the excitation wavelength of Sr2SiO4:Eu2+ phosphor is relatively short, and the excitation effect is within the emission range of the blue light chip (ie around 460nm). still not ideal

Method used

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  • Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof
  • Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof
  • Sr2SiO4: Eu2+, N fluorescent powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Take 11.84 g of strontium carbonate, 2.4 g of silicon oxide, and 0.70 g of europium oxide, and mix them by ball milling with ethanol as the ball milling medium. After mixing evenly, the raw materials were vacuum-dried at 70° C. for 6 hours, and passed through a 200-mesh sieve. Put the obtained ingredients into an alumina porcelain boat, put it into a tube-type atmosphere furnace, feed ammonia gas, the flow rate of ammonia gas is 300ml / min, the temperature is raised to 1200°C, and the heating rate is 4°C / min, at this temperature, Keep warm for 2 hours. Under flowing ammonia gas, take it out after natural cooling to room temperature, and use manual crushing to finally obtain N-doped Sr 2 SiO 4 :Eu 2+ Phosphor. Wherein, the stoichiometric ratio of Sr, Si, Eu, and N is 2:1:0.05:0.12.

[0030] figure 1 N-doped Sr obtained by nitriding at 1200°C for 2 hours in an ammonia gas stream 2 SiO 4 :Eu 2+ The X-ray diffraction pattern of phosphor powder shows that the produc...

Embodiment 2

[0032]Take 11.84g of strontium carbonate, 2.4g of silicon oxide, and 0.42g of europium oxide, and mix them by ball milling with ethanol as the ball milling medium. After mixing evenly, the raw materials were vacuum-dried at 50° C. for 12 hours, and passed through a 150-mesh sieve. Put the obtained ingredients into an alumina porcelain boat, put it into a tube-type atmosphere furnace, feed ammonia gas, the flow rate of ammonia gas is 100ml / min, the temperature is raised to 1400°C, and the heating rate is 2°C / min, at this temperature, Keep warm for 2 hours. Under flowing ammonia gas, naturally cool to room temperature, take it out, and use ball milling to get N-doped Sr 2 SiO 4 :Eu 2+ Phosphor. Wherein, the stoichiometric ratio of Sr, Si, Eu, and N is 2:1:0.03:0.36.

[0033] Figure 4 N-doped Sr obtained by nitriding at 1400°C for 2 hours in an ammonia gas stream 2 SiO 4 :Eu 2+ The X-ray diffraction pattern of the phosphor, the phase of the product after nitriding is co...

Embodiment 3

[0035] Take 11.84g of strontium carbonate, 2.4g of silicon oxide, and 0.42g of europium oxide, and mix them by ball milling with ethanol as the ball milling medium. After mixing evenly, the raw materials were vacuum-dried at 70° C. for 6 hours, and passed through a 200-mesh sieve. Put the obtained ingredients into an alumina porcelain boat, put it into a tube-type atmosphere furnace, feed ammonia gas, the flow rate of ammonia gas is 300ml / min, the temperature is raised to 1500°C, and the heating rate is 2°C / min, at this temperature, Keep warm for 1 hour. Under flowing ammonia gas, naturally cool to room temperature, take it out, and use ball milling to get N-doped Sr 2 SiO 4 :Eu 2+ Phosphor. Wherein, the stoichiometric ratio of Sr, Si, Eu, and N is 2:1:0.03:0.42.

[0036] Figure 7 N-doped Sr obtained by nitriding at 1500°C for 1 hour in ammonia gas flow 2 SiO 4 :Eu 2+ The X-ray diffraction pattern of the phosphor, the phase of the product after nitriding is consisten...

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Abstract

The invention relates to Sr2SiO4: Eu<2+>, N fluorescent powder and a preparation method thereof. The stoichiometric ratio of Sr to Si to Eu to N is 2: 1: x: y, wherein x is more than or equal to 0.03 and less than or equal to 0.05, and y is more than 0 and less than or equal to 0.5. The preparation method comprises the following steps of: mixing strontium carbonate, silicon oxide and europium oxide serving as raw materials uniformly, and screening and drying the mixture; nitriding the dried mixture in flowing ammonia gas flow; and crushing the product after nitriding to obtain bright yellow fluorescent powder. The N-doped Sr2SiO4: Eu<2+> fluorescent powder has wide excitation range and good effect of matching a blue light emitting diode (LED) chip; and the preparation method is simple, can conveniently realize control of emission wavelength during preparation, and is suitable for industrialized production.

Description

technical field [0001] The present invention belongs to Sr 2 SiO 4 :Eu 2+ Fluorescent powder and its preparation field, especially relate to a kind of Sr 2 SiO 4 :Eu 2+ , N fluorescent powder and preparation method thereof. Background technique [0002] With the development of white LED technology and the popularity of solid-state lighting, traditional white LED phosphors have gradually been unable to meet the growing needs of people. Currently widely used Eu 2+ and Ce 3+ Doped oxide phosphors (such as YAG:Ce phosphors), due to the limitation of oxide crystal field strength, it is difficult to extend the luminescence to the long-wavelength region, which leads to high color temperature and low color rendering index of white LEDs. In order to solve these problems, people have developed chalcogenide phosphors (such as SrS:Eu 2+ and CaS:Eu 2+ ) and nitride phosphors (such as Ca 2 Si 5 N 8 :Eu), however, sulfur-based phosphors have poor stability and are prone to del...

Claims

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Application Information

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IPC IPC(8): C09K11/59
Inventor 王宏志谷鋆鑫李耀刚张青红
Owner DONGHUA UNIV
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