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Yellow fluorescent powder and preparation method thereof and light emitting device using fluorescent powder

A technology for yellow phosphors and light-emitting devices, applied in the field of yellow phosphors, which can solve the problems of reduced luminous intensity and many surface defects of phosphors, and achieve the effects of reducing production costs, high luminous intensity, and improving luminous intensity

Inactive Publication Date: 2014-12-31
NINGBO SUNPU OPTO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above post-treatment process will make the surface defects of YAG:Ce more, resulting in a decrease in the luminous intensity of the phosphor

Method used

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  • Yellow fluorescent powder and preparation method thereof and light emitting device using fluorescent powder
  • Yellow fluorescent powder and preparation method thereof and light emitting device using fluorescent powder
  • Yellow fluorescent powder and preparation method thereof and light emitting device using fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The chemical formula of embodiment 1 fluorescent powder is Y 2.9 Ce 0.09 Sr 0.01 al 4.99 Si 0.01 o 12

[0049] The raw material is Y 2 o 3 (analytical pure), CeO 2 (analytical pure), SrCO 3 (analytical pure), Al 2 o 3 (analytical pure) and SiO 2 (analytical pure). The molar ratio is 1.45:0.09:0.01:2.495:0.01. Grind and mix the raw materials and place them in an alumina container. Sinter at a temperature of 1550°C for 4 hours. The sintering atmosphere is a mixture of nitrogen and hydrogen. The sintered powder Take it out from the container, choose crushing, grading, and treat it with hydrochloric acid with a molar concentration of 3 moles per liter, adjust the average particle size of the synthesized phosphor to 15 μm, then wash the phosphor repeatedly with distilled water until it is neutral, and then remove the phosphor Put the powder in an alumina container, reduce it at 1400°C for 4 hours, and use hydrogen as the reducing atmosphere to get the desired ph...

Embodiment 2

[0050] The chemical formula of embodiment 2 fluorescent powder is Y 2.89 Ce 0.09 Sr 0.02 al 4.98 Si 0.02 o 12

[0051] The raw material is Y 2 o 3 (analytical pure), CeO 2 (analytical pure), SrCO 3(analytical pure), Al 2 o 3 (analytical pure) and SiO 2 (analytical pure). The molar ratio is 1.445:0.09:0.02:2.49:0.02, the raw materials are ground and mixed, placed in a zirconia container, and sintered at a temperature of 1550°C for 4 hours, the sintering atmosphere is a mixture of nitrogen and hydrogen, and the sintered powder Take it out from the container, choose crushing, grading, and treat it with hydrochloric acid with a molar concentration of 3 moles per liter, adjust the average particle size of the synthesized phosphor to 15 μm, then wash the phosphor repeatedly with distilled water until it is neutral, and then remove the phosphor Put the powder in an alumina container, and reduce it at 1350° C. for 4 hours, and the reducing atmosphere is hydrogen, and then...

Embodiment 3

[0052] The chemical formula of embodiment 3 fluorescent powder is Y 2.88 Ce 0.09 Sr 0.03 al 4.97 Si 0.03 o 12

[0053] The raw material is Y 2 o 3 (analytical pure), CeO 2 (analytical pure), SrCO 3 (analytical pure), Al 2 o 3 (analytical pure) and SiO 2 (analytical pure). The molar ratio is 1.44:0.09:0.03:2.485:0.03. Grind and mix the raw materials and place them in an alumina container. Sinter at 1500°C for 4 hours. The sintering atmosphere is a mixture of nitrogen and hydrogen. The sintered powder Take it out from the container, choose crushing, grading, and treat it with hydrochloric acid with a molar concentration of 3 moles per liter, adjust the average particle size of the synthesized phosphor to 15 μm, then wash the phosphor repeatedly with distilled water until it is neutral, and then remove the phosphor Put the powder in an alumina container, reduce it at 1400°C for 4 hours, and use hydrogen as the reducing atmosphere to get the desired phosphor. Ce in t...

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Abstract

The invention discloses a yellow fluorescent powder and a preparation method thereof and a light emitting device prepared from the fluorescent powder. The fluorescent powder has the chemical formula of A[x]Z[y]Ce[3-x-y]E[m]D[5-m]O[12], wherein A is one or more elements of La, Y, Lu and Tb, Z is one or more elements of Zn, Mg, Ca, Sr and Ba, E is one or more elements of Al, In and Ga, D is one or two of Si and Ge, 0<x<3, 0<y<=0.2, x+y<3, 4.8<=m<5, and y+m=5. The yellow fluorescent powder has the advantages of low production cost, simple process and higher light emitting intensity.

Description

technical field [0001] The invention relates to a yellow fluorescent powder, and also relates to a preparation method of the fluorescent powder and a light-emitting device made of the fluorescent powder, belonging to the technical field of inorganic light-emitting materials. Background technique [0002] LED (Light emitting diode) is a semiconductor device that can convert electrical energy into light energy. Due to the advantages of high efficiency, energy saving, environmental protection, firm structure, long service life and short response time, white LEDs have been widely used in indication, backlight and lighting fields. Common white light LEDs mostly rely on phosphor powder conversion to achieve white light output. The more common methods include the following two: [0003] ①Three primary color phosphor conversion LED. Ultraviolet (UV) LEDs are used to excite a group of phosphors that can be effectively excited by ultraviolet light to emit red, green, and blue colors...

Claims

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Application Information

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IPC IPC(8): C09K11/80H01L33/50
CPCH01L2224/48091H01L2224/48247H01L2924/00014
Inventor 张日光周天亮朱小清林胜王义飞
Owner NINGBO SUNPU OPTO SEMICON
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