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High-property YAG phosphor powder for white LED and preparation method thereof

A manufacturing method and phosphor technology, applied in the field of YAG phosphor, can solve the problems of decreased luminous flux, low luminous brightness, poor thermal stability, etc., and achieve the effects of enhanced excitation intensity, superior luminous performance, and good thermal stability

Inactive Publication Date: 2010-09-22
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

[0006] Currently commercialized white LEDs in the market are mainly φ5mm, 20mA low-power packages, with a brightness of 80lm / w. The luminous brightness is not high, and the luminous flux drops sharply after 1000 hours. About 60% of the original, and there are still a series of problems such as chromaticity coordinate drift
This is related to factors such as the low luminance of YAG:Ce phosphor, poor thermal stability, and large light decay.

Method used

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  • High-property YAG phosphor powder for white LED and preparation method thereof
  • High-property YAG phosphor powder for white LED and preparation method thereof
  • High-property YAG phosphor powder for white LED and preparation method thereof

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Effect test

Embodiment 1

[0031] The chemical composition formula of embodiment 1 is: Y 2.8997 Al 5.0 o 12 : Ce 0.1 Sb 0.0003

[0032] Accurately weighed according to the above chemical composition: 177.325g Y 2 o 3 , 138.00g Al 2 o 3 , 9.308g CeO 2 , 23.0mg Sb 2 o 3 , 16.00g flux BaF 2

Embodiment 2

[0033] The chemical composition formula of embodiment 2 is: Y 2.0797 Gd 0.8 Al 5.0 o 12 : Ce 0.12 Sb 0.0003

[0034] Accurately weighed according to the above chemical composition: 116.121g Y 2 o 3 , 126.00g Al 2 o 3 , 71.667g Gd 2 o 3 , 10.198g CeO 2 , 21.0mg Sb 2 o 3 , 6.00g flux BaF 2

[0035] The chemical composition formulas of Examples 3-18 are shown in Table 1.

Embodiment 1～18

[0036] The preparation method of embodiment 1~18 is:

[0037] 1) Mixing: Accurately weigh the raw materials according to the composition of the fluorescent powder, add conventional flux, and put them into the mixer for 24 hours;

[0038] 2) Pre-firing at high temperature: put the mixed material into a crucible, pack it tightly and solidly, heat it in air at normal pressure for 3 hours at 1650°C, and then pre-fire;

[0039] 3) High-temperature reduction: roughly crush the fired material, pass through a 100-mesh sieve, then finely crush it, pass through a 150-mesh sieve, and use H 2 :N 2 = 7:3 reducing atmosphere, 1550 ° C for 3 hours;

[0040] 4) crush the high-temperature reduced material, pass through a 150-mesh sieve, and mix the sieved powder with the mass ratio of powder: ball: pure water = 1:2:3, and mix the material with glass marbles with a diameter of 2 to 5 mm and pure Mix with water, ball mill for 1 hour, remove glass marbles, pass through a 500-mesh sieve while w...

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Abstract

The invention relates to a YAG phosphor powder for white LED and a preparation method thereof. Sensitizers of Sb, Bi and the like are added and codoped into the YAG phosphor powder, therefore excitation intensity, emission intensity and other good properties of cerium are sensitized and intensified. The YAG phosphor powder has the following chemical composition: Y3-a-b-cGdaAl5012:CebMc, wherein M represents Sb and Bi; a is not less than 0, but is not more than 2.0; b is not less than 0.005, but is not more than 0.2; and c is not less than 0.0001, but is not more than 0.001. The preparation method comprises the following steps of: mixing materials, presintering at high temperature, reducing at high temperature, crushing, sieving, ball milling, wet sieving, cleaning, drying, and reducing and restoring at low temperature. The quadrivalent cerium with damaged crystal plane is restored and reduced into the trivalent cerium, thereby intensifying the excitation intensity and emission intensity of the phosphor powder, intensifying the heat resistance property of the phosphor powder, and decreasing the light attenuation. The phosphor powder has the advantages of high illumination intensity, good thermal stability and good property.

Description

technical field [0001] The invention relates to a YAG fluorescent powder excited by blue light for a white light LED and a manufacturing method thereof. 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 cr...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00
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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