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Manufacturing method of yttrium aluminum garnet (YAG) fluorescent powder for white light LED

A manufacturing method and phosphor technology, which are applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of affecting the service life of firing equipment, poor luminescence performance of phosphors, and increased production costs, and achieve emission intensity and brightness luminous intensity. The effect of high, low light decay, and increased absorption intensity

Inactive Publication Date: 2010-07-28
佛山市南海区朗达荧光材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher the temperature, especially the high temperature with a reducing atmosphere, it is easy to damage the equipment, which directly affects the service life of the firing equipment and leads to an increase in production costs.
[0009] Considering comprehensively, in the production of existing YAG phosphors, high-temperature reduction is usually carried out at about 1550°C. Although the service life of the equipment can be extended, the phosphors produced in this way have poor luminous performance

Method used

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  • Manufacturing method of yttrium aluminum garnet (YAG) fluorescent powder for white light LED
  • Manufacturing method of yttrium aluminum garnet (YAG) fluorescent powder for white light LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of YAG phosphor is Y 2.9 al 5.0 o 12 : Ce 0.1

[0025] 1) Mixing: Accurately weigh 177.344g Y 2 o 3 , 138.00g Al 2 o 3 , 9.308g CeO 2 , 16.00g flux BaF 2 , put into the mixer and mix for 24 hours;

[0026] 2) High-temperature pre-firing: put the mixed material into a crucible, pack it tightly and solidly, and heat it in normal pressure air for 4 hours at 1600°C, then pre-fire;

[0027] 3) High-temperature reduction: coarsely crush the pre-fired material, pass through a 100-mesh sieve, then finely crush it, pass through a 150-mesh sieve,

[0028] Loosely loaded into the crucible, using H 2 :N 2 = 7:3 reducing atmosphere, 1550 ° C for 2 hours;

[0029] 4) Break the high-temperature reduced material, sieve it with 150 mesh, and ball mill it. During ball milling, mix the material with glass marbles with a diameter of 2 to 5 mm and pure water according to the mass ratio of powder: ball: pure water = 1:2:3 , ball mill for 1 hour, remove the glass...

Embodiment 2

[0035] The composition of the YAG fluorescent powder and the types of raw materials are exactly the same as in Example 1, and the reaction steps 1) to 6) and step 8) are exactly the same as in Example 1, except that in step 7), the reduction temperature is 1200°C.

Embodiment 3

[0042] The composition of YAG phosphor is Y 2.81 Gd 0.07 al 5.0 o 12 : Ce 0.12

[0043] 1) Mixing: Accurately weigh 168.104g Y 2 o 3 , 135.00g Al 2 o 3 , 6.718g Gd 2 o 3 , 10.927gCeO 2 , 16.00g flux BaF 2 , put into the mixer and mix for 24 hours;

[0044] 2) High-temperature pre-firing: put the mixed material into a crucible, pack it tightly and solidly, keep it warm in normal pressure air for 5 hours at 1550°C, and pre-fire;

[0045] 3) High-temperature reduction: roughly crush the pre-fired material, pass through a 100-mesh sieve, then finely crush it, pass through a 150-mesh sieve, loosely put it into a crucible, and use H 2 :N 2 = 1:1 reducing atmosphere, 1450°C heat preservation for 5 hours;

[0046] 4) Break the high-temperature reduced material, sieve it through a 150-mesh sieve, and ball mill it. During ball milling, mix the material with glass marbles with a diameter of 2 to 5 mm and pure water according to the mass ratio of powder:ball:pure water=1:1....

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Abstract

The invention discloses a manufacturing method of yttrium aluminum garnet (YAG) fluorescent powder for a white light LED with high brightness. The manufacturing method comprises the following steps of: adopting once high-temperature presintering, crushing and then entering into a secondary high-temperature reducing sintering, and then crushing, screening, ball-milling, wetly sieving and washing the dried fluorescent powder, wherein the lighting brightness of the fluorescent powder is reduced due to partial crystal defects caused by mechanical crushing, and the like; and in the invention, a 1200-1400 DEG C low-temperature reducing restoration process is then increased so that tetravalent cerium of the damaged crystal face is reduced into tervalent cerium, therefore, the brightness of the fluorescent powder is improved. The fluorescent powder for the white light LED has increased 450-460nm absorption intensity, high emission intensity and relative brightness, good thermal stability and less optical attenuation.

Description

technical field [0001] The invention relates to a method for manufacturing fluorescent powder for white light LEDs. Background technique [0002] White light LED has many excellent characteristics such as high efficiency, energy saving, environmental protection, long life, solid state, stable performance, fast response, small size, and impact resistance. At present, white light LEDs have been used in indicator lights, liquid crystal backlights, large-area graphic displays, sign lighting, signals, communications, etc., and are gradually entering the lighting field. [0003] There are many ways to produce white LEDs, among which the more mature one is to coat the blue LED chip with yellow phosphor powder that can be excited by blue light, emit yellow light and mix with blue light to form white light. [0004] At present, the phosphor powder used in white LED is mainly YAG:Ce yellow powder. [0005] YAG:Ce is a cubic crystal with a hard crystal and a yttrium aluminum garnet s...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 范伟明仝茂福林智敏
Owner 佛山市南海区朗达荧光材料有限公司
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