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Silicon carbide modified YAG:Ce fluorescent powder and preparation method thereof

A fluorescent powder and silicon carbide technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve the problems of thermal stability and luminous efficiency, unfavorable white LED light source, etc., and achieve high thermal stability , the effect of high luminous efficiency

Active Publication Date: 2020-04-24
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

to join Si 3 N 4 For example, this method can effectively red-shift the emission spectrum of YAG:Ce phosphor, but at the same time, it is accompanied by the problems of thermal stability and luminous efficiency, which are unfavorable for white LED light sources, especially for high-power White LED light source
So what is the effect of adding SiC on the luminescence performance of YAG:Ce phosphor? There is no research report on this aspect yet.

Method used

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  • Silicon carbide modified YAG:Ce fluorescent powder and preparation method thereof
  • Silicon carbide modified YAG:Ce fluorescent powder and preparation method thereof
  • Silicon carbide modified YAG:Ce fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Y 2.925 al 5 o 12 :0.075Ce,0.01SiC

[0027] (1) Set the target product Y 2.925 al 5 o 12 : 0.075Ce, 0.01SiC has a mass of 20 g, and Y is weighed according to the ratio of Y:Al:Ce:Si: 2.925:5:0.075:0.01 2 o 3 (99.99%), Al 2 o 3 (99.99%), CeO 2 (99.99%), SiC (99.9%) raw materials, using a planetary ball mill for 10-20 h;

[0028] (2) Put the precursor mixture obtained in step (1) into a high-purity alumina crucible, and then place it in a high-temperature tubular furnace. Under a reducing atmosphere, keep it at 1500 °C for 5 h, and the heating rate is 600 °C / h , the synthesized phosphor is naturally cooled with the furnace body;

[0029] (3) Take out the phosphor powder synthesized in step (2), put it into a beaker filled with deionized water, add concentrated hydrochloric acid with a mass fraction of 36%-38%, and the volume ratio of deionized water to concentrated hydrochloric acid is 10: 1. Stir at 100 °C for 20 min, let stand to separate layers, ...

Embodiment 2

[0030] Example 2: Y 2.925 al 5 o 12 :0.075Ce,0.03SiC

[0031] (1) Set the target product Y 2.925 al 5 o 12 : 0.075Ce, 0.03SiC has a mass of 20 g, and Y is weighed according to the ratio of Y:Al:Ce:Si: 2.925:5:0.075:0.03 2 o 3 (99.99%), Al 2 o 3 (99.99%), CeO 2 (99.99%), SiC (99.9%) raw materials, using a planetary ball mill for 10-20 h;

[0032] (2) Put the precursor mixture obtained in step (1) into a high-purity alumina crucible, and then place it in a high-temperature tubular furnace. Under a reducing atmosphere, keep it at 1500 °C for 5 h, and the heating rate is 600 °C / h , the synthesized phosphor is naturally cooled with the furnace body;

[0033] (3) Take out the phosphor powder synthesized in step (2), put it into a beaker filled with deionized water, add concentrated hydrochloric acid with a mass fraction of 36%-38%, and the volume ratio of deionized water to concentrated hydrochloric acid is 10: 1. Stir at 100 °C for 20 min, let stand to separate layers, ...

Embodiment 3

[0034] Example 3: Y 2.925 al 5 o 12 :0.075Ce,0.05SiC

[0035](1) Set the target product Y 2.925 al 5 o 12 : 0.075Ce, 0.05SiC has a mass of 20 g, and Y is weighed according to the ratio of Y:Al:Ce:Si: 2.925:5:0.075:0.05 2 o 3 (99.99%), Al 2 o 3 (99.99%), CeO 2 (99.99%), SiC (99.9%) raw materials, using a planetary ball mill for 10-20 h;

[0036] (2) Put the precursor mixture obtained in step (1) into a high-purity alumina crucible, and then place it in a high-temperature tubular furnace. Under a reducing atmosphere, keep it at 1500 °C for 5 h, and the heating rate is 600 °C / h , the synthesized phosphor is naturally cooled with the furnace body;

[0037] (3) Take out the phosphor powder synthesized in step (2), put it into a beaker filled with deionized water, add concentrated hydrochloric acid with a mass fraction of 36%-38%, and the volume ratio of deionized water to concentrated hydrochloric acid is 10: 1. Stir at 100 °C for 20 min, let stand to separate layers, f...

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Abstract

The invention discloses silicon carbide modified YAG:Ce fluorescent powder and a preparation method thereof. The general chemical formula of the fluorescent powder is Y3-xAl5O12: xCe, ySiC, x is larger than 0 and smaller than or equal to 0.09, and y is larger than 0 and smaller than or equal to 0.05. The silicon carbide modified YAG:Ce fluorescent powder emits yellow fluorescence with a main wavelength of 556+ / -2 nm under the excitation of blue light with the wavelength of 460 nm. Compared with the prior art, the thermal stability of the YAG: Ce fluorescent powder is improved while the emission spectrum red shift and higher luminous efficiency of the YAG:Ce fluorescent powder are ensured.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials, and relates to a silicon carbide modified YAG:Ce fluorescent powder and a preparation method thereof. Background technique [0002] With the continuous aggravation of energy problems, energy conservation and environmental protection have become one of the development themes of countries all over the world. White light emitting diode (Light Emitting Diode, referred to as LED) has the characteristics of low energy consumption, high efficiency, no pollution, long life, etc., and has very broad application prospects in solid-state lighting, liquid crystal backlight, automotive headlights and other fields. [0003] At present, the most commonly used white light LED in the market is the phosphor-converted white light LED. White light is obtained by coating the phosphor layer on the surface of the LED chip. Therefore, the performance of the phosphor plays a key role in the performance of...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCC09K11/7774Y02B20/00
Inventor 王晓君谷池张长华
Owner XUZHOU NORMAL UNIVERSITY
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