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Method for preparing YAG: Ce fluorescent powder through laser firing

A laser burning and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as being unsuitable for large-scale industrial production, complex process, and high energy consumption.

Inactive Publication Date: 2020-07-07
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature solid-phase reaction method has a simple process and high production efficiency, but the high-temperature solid-phase reaction method needs to use a high-temperature furnace to burn the reaction at a high temperature of 1400-1500°C, which consumes a lot of energy, and the reaction time takes 5-6 hours, plus heating and cooling time, a cycle takes about 15 hours
In addition, there are other methods for preparing YAG:Ce phosphor, such as sol-gel method, hydrothermal method, co-precipitation method, etc., but these methods are complicated in process and are not suitable for mass industrial production.

Method used

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  • Method for preparing YAG: Ce fluorescent powder through laser firing
  • Method for preparing YAG: Ce fluorescent powder through laser firing
  • Method for preparing YAG: Ce fluorescent powder through laser firing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the stoichiometric ratio, YAG:0.06Ce weighs Y 2 o 3 , Al 2 o 3 , CeO 2 , after mixing and grinding the above raw materials, put them in a tableting mold, control the amount of the mixture, so that the thickness of the tablet is about 2mm, place the tableting mold on the tableting machine, pressurize 20MPa, and make a tablet; use Laser irradiate the mixture to press the tablet for laser burning. The laser power is controlled at 30W, and the tablet is scanned point by point. The burning time of each point is 25s, until the entire tablet is completely reacted, yellow, and YAG:Ce is generated; laser Burning to prepare the YAG:Ce phosphor is carried out in an air atmosphere at normal pressure; the finished pellets are ground to obtain the YAG:Ce yellow phosphor.

[0014] The excitation wavelength range of the fluorescent powder is 400-550nm, the excitation peak is at 470nm, the emission wavelength range is 480-700nm, and the emission peak is at 530nm.

Embodiment 2

[0016] According to the stoichiometric ratio, YAG:0.06Ce weighs Y 2 o 3 , Al 2 o 3 , CeO 2 , after mixing and grinding the above-mentioned raw materials, put them in a tableting mold, control the amount of the mixture to make the thickness of the tableting be about 1.5mm, place the tableting mold on the tableting machine, pressurize at 20MPa, and make the tableting; Use laser to irradiate the mixture to press the tablet for laser burning. The laser power is controlled at 35W, and the tablet is scanned point by point. The burning time of each point is 20s, until the entire tablet is completely reacted, and it turns yellow to generate YAG:Ce. ; Preparation of YAG:Ce phosphor by laser burning is carried out in an air atmosphere and under normal pressure; grinding the finished tablet to obtain YAG:Ce yellow phosphor.

[0017] The excitation wavelength range of the fluorescent powder is 400-550nm, the excitation peak is at 470nm, the emission wavelength range is 480-700nm, and ...

Embodiment 3

[0019] According to the stoichiometric ratio, YAG:0.06Ce weighs Y 2 o 3 , Al 2 o 3 , CeO 2 , after mixing and grinding the above raw materials, put them in a tableting mold, control the amount of the mixture to make the thickness of the tableting is about 2.5mm, place the tableting mold on the tableting machine, pressurize at 20MPa, and make a tablet; Use laser to irradiate the mixture to press the tablet for laser burning. The laser power is controlled at 40W, and the tablet is scanned point by point. The burning time of each point is 30s, until the entire pressed tablet is completely reacted, turns yellow, and produces YAG:Ce; Preparation of YAG:Ce phosphor by laser burning is carried out in an air atmosphere at normal pressure; grinding the finished pellets to obtain YAG:Ce yellow phosphor.

[0020] The excitation wavelength range of the fluorescent powder is 400-550nm, the excitation peak is at 470nm, the emission wavelength range is 480-700nm, and the emission peak is...

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Abstract

The invention provides a method for preparing YAG: Ce yellow fluorescent powder by laser firing, which comprises the following steps: (1) weighing Y2O3, Al2O3 and CeO2 in proportion, grinding and mixing, and tabletting at the tabletting pressure of 15-20 MPa and the tabletting thickness of 1-3 mm; and (2) irradiating the mixture tablet with laser to carry out laser firing, controlling the laser power to be 30-40 W, and carrying out point-by-point scanning on the tablet by firing each point for 10-30 s until the whole tablet completely finishes the reaction and becomes yellow, thereby generating the YAG: Ce. By irradiating the mixture tablet under layer, the high temperature is locally generated on the mixture tablet in a short time, so that the Y2O3, Al2O3 and CeO2 mixture is subjected tosolid-phase reaction to generate YAG: Ce. In the method, the preparation time is short, the production efficiency is high, the reaction heat utilization rate is high, and heat preservation equipment is not needed; besides, the reaction is carried out in an air atmosphere under normal pressure and air pressure, and the atmosphere and pressure do not need to be controlled.

Description

technical field [0001] The invention belongs to the field of fluorescent powder preparation, in particular to a method for preparing yellow fluorescent powder for white light LEDs and cathode rays. Background technique [0002] The scheme of synthesizing white light LED is mainly the phosphor light conversion method, that is, the blue light chip is used to compound the yellow phosphor powder and the near ultraviolet chip is compounded with three primary color phosphors. Among them, due to the high luminous efficiency of the blue light chip, the blue light chip is mostly used to match the yellow phosphor powder. , YAG: Ce phosphor is not only the phosphor used in "blue light chip composite yellow phosphor". [0003] The method used in the existing production to prepare YAG:Ce phosphor is a high-temperature solid-state reaction method. The high-temperature solid-phase reaction method has a simple process and high production efficiency, but the high-temperature solid-phase rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7774
Inventor 王晓春刘全生张希艳柏朝晖孙海鹰王能利卢利平米晓云
Owner CHANGCHUN UNIV OF SCI & TECH