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Preparation method of nitrogen oxide green fluorescent powder material

A technology of green fluorescent powder and nitrogen oxides, which is applied in the direction of luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, etc., can solve the problems of low brightness, harsh synthesis conditions, and low purity of product crystal phases, and achieve broad color gamut, brightening effect

Inactive Publication Date: 2011-09-21
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis conditions of the conventional method are relatively harsh, and the crystal phase purity of the obtained product is low, resulting in a slightly lower brightness than other systems. Secondly, the emission peak of the synthetic product is located at 540nm, and it emits blue-green-yellow under the excitation of the ultraviolet-blue chip. Green light is obviously not enough for white LEDs used in backlights that require high color rendering index

Method used

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  • Preparation method of nitrogen oxide green fluorescent powder material
  • Preparation method of nitrogen oxide green fluorescent powder material
  • Preparation method of nitrogen oxide green fluorescent powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step is to synthesize the precursor Sr of the nitrogen oxide green phosphor material 2 SiO 4 :

[0025] Weigh SrCO according to the stoichiometric ratio Sr:Si=2:1 3 147.61g, SiO 2 30.04g, and it is ground, mixes and obtains primary mixture, adds the fluxing agent SrF that accounts for primary mixture total amount 3wt% in primary mixture 2 , put in an alumina crucible after mixing and fully grinding, put the crucible in a tube furnace, in the protective gas N 2 / H 2 Sintered at 1250°C for 3 hours and then cooled to obtain Sr 2 SiO 4 .

[0026] In the second step, in the prebody Sr 2 SiO 4 Doping elements in the provided matrix structure to synthesize the oxynitride green phosphor material BaSr 0.98 SiO 1.5 ClN:0.02Eu:

[0027] According to BaSr 0.98 SiO 1.5The stoichiometric ratio of ClN:0.02Eu (Sr, Ba):Si:(O,Cl):N:Eu=1.98:1:2.5:1:0.02, weigh BaCO 3 2.5g, BaCl 2 2.638g, α-Si 3 N 4 0.605g and Eu 2 o 3 0.089g; Then the gained Sr 2 SiO 4 Afte...

Embodiment 2

[0029] The first step is to synthesize the precursor Sr of the nitrogen oxide green phosphor material 2 SiO 4 :

[0030] Weigh SrCO according to the stoichiometric ratio Sr:Si=2:1 3 147.61g, SiO 2 30.04g, and it is ground, mixes and obtains primary mixture, adds the fluxing agent SrF that accounts for primary mixture total amount 2wt% in primary mixture 2 , put in an alumina crucible after mixing and fully grinding, put the crucible in a tube furnace, in the protective gas N 2 Sintered at 1250°C for 3 hours and then cooled to obtain Sr 2 SiO 4 .

[0031] In the second step, in the prebody Sr 2 SiO 4 Doping elements in the provided matrix structure to synthesize the oxynitride green phosphor material BaSr 0.98 SiOCl 2 N:0.02Eu:

[0032] According to BaSr 0.98 SiOCl 2 N:0.02Eu element stoichiometric ratio (Sr, Ba):Si:(O,Cl):N:Eu=1.98:1:3:1:0.02, weigh BaCl 2 5g, α-Si 3 N 4 0.605g and Eu 2 o 3 0.089g, then the resulting Sr 2 SiO 4 After grinding and sieving,...

Embodiment 3

[0034] The first step is to synthesize the precursor Sr of the nitrogen oxide green phosphor material 2 SiO 4 :

[0035] Weigh SrCO according to the stoichiometric ratio Sr:Si=2:1 3 147.61g, SiO 2 30.04g, SrF 2 , and it is ground and mixed to obtain a primary mixture, and the fluxing agent SrF that accounts for 4wt% of the total amount of the primary mixture is added in the primary mixture 2 , put in an alumina crucible after mixing and fully grinding, put the crucible in a tube furnace, in the protective gas NH 3 Sintered at 1250°C for 3 hours and then cooled to obtain Sr 2 SiO 4 .

[0036] In the second step, in the prebody Sr 2 SiO 4 Doping elements in the provided matrix structure to synthesize the oxynitride green phosphor material BaSr 0.98 SiO 1.7 Cl 0.6 N:0.02Eu:

[0037] According to BaSr 0.98 SiO 1.7 Cl 0.6 N:0.02Eu element stoichiometric ratio (Sr, Ba):Si:(O,Cl):N:Eu=1.98:1:2.3:1:0.02, weigh BaCO 3 3.499g, BaCl 2 1.583g, α-Si 3 N 4 0.605g and E...

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Abstract

The invention discloses a nitrogen oxide green fluorescent powder material; and the chemical general formula of the nitrogen oxide green fluorescent powder material is (Ba,A)(2-x)Siy(O,B)zN2+4y-2z:xEu, wherein 0<=x<1.0, 0<y<=1, 1<z<=2.0, A is Ca or Sr element, and B is F or Cl element. In the preparation method, two-step synthesis is adopted to prepare the nitrogen oxide green fluorescent powder and the method comprises the following steps: 1) synthesizing A2SiO4 which is the precursor of the nitrogen oxide green fluorescent powder; and 2) doping elements in the matrix structure provided by the precursor A2SiO4 to synthesize the nitrogen oxide green fluorescent powder material (Ba,A)(2-x)Siy(O,B)zN(2+4y-2z):xEu. By adopting the method, the brightness of the nitrogen oxide green fluorescent powder can be increased and the emission wavelength of the nitrogen oxide green fluorescent powder can be modulated; by adjusting the doping amount of each element, the color gamut of the nitrogen oxide green fluorescent powder can be broadened effectively; and the fluorescent powder can be used to satisfy the lighting demand and used in the white LED backlight with high color rendering index. The method is simple and practical, and is suitable for the large-scale industrial production.

Description

technical field [0001] The invention relates to a nitrogen oxide green phosphor material and a preparation method thereof, in particular to a method of improving the brightness of the nitrogen oxide green phosphor by using common cheap compounds as raw materials and doping with Ba, F, and Cl elements and modulation The method of emission wavelength of nitrogen oxide phosphor. Background technique [0002] The white light-emitting device can excite three primary colors (red, green, and blue) phosphors by using a UV light-emitting diode (UV LED) as a light source, excite red and green phosphors by using a blue LED as a light source, or excite phosphors by using a blue LED as a light source. yellow phosphor to produce white light. [0003] Among the three methods, the method of generating white light by exciting yellow phosphors using a blue LED as a light source results in poor color reproducibility due to the low intensity of green light. [0004] Due to its unique excitati...

Claims

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Application Information

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IPC IPC(8): C09K11/61H01L33/50
CPCY02B20/181Y02B20/00
Inventor 赵莉
Owner IRICO
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