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Yellow fluorescent powder used for white light LED and preparation method thereof

A yellow phosphor and phosphor technology, applied in the field of materials, can solve the problems of high price and high synthesis temperature of rare earth elements or red phosphors, and achieve the effects of promoting grain growth, increasing emission light intensity and low cost

Inactive Publication Date: 2014-11-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional YAG:Ce yellow phosphor preparation method has a high synthesis temperature, and the price of rare earth elements or red phosphors used to adjust the emission wavelength is high.

Method used

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  • Yellow fluorescent powder used for white light LED and preparation method thereof
  • Yellow fluorescent powder used for white light LED and preparation method thereof
  • Yellow fluorescent powder used for white light LED and preparation method thereof

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preparation example Construction

[0023] The preparation method of the above-mentioned yellow fluorescent powder for white light LED comprises the following steps:

[0024] Step 1, according to chemical formula Y 2.94-x Ce 0.06 K 3x Al 5 o 12-1.5x f 3x The stoichiometric ratio weighs Y 2 o 3 or Y(NO 3 ) 3 、Al 2 o 3 or Al(NO 3 ) 3 , CeO 2 or Ce(NO 3 ) 4 , KF, fully mixed and put into an agate ball mill jar filled with ethanol for ball milling for 12h to 24h to obtain a slurry;

[0025] Step 2. Dry the slurry obtained in step 1 in a drying oven at 80°C to 90°C for 12h to 24h to obtain dry powder; then pre-fire the dry powder in an electric furnace at 1200°C to 1400°C for 3h to 12h, and cool naturally to At room temperature, the pre-burned reactant is obtained;

[0026] Step 3. Hand-grind the pre-burned reactant obtained in step 2 with an agate mortar for 10-30 minutes to make it fully pulverized, and then put it into a 95%-90% N 2 +5%~10%H 2 Heating to 1500°C-1600°C in an electric furnace with...

Embodiment 1

[0029] According to chemical formula Y 2.94-x Ce 0.06 K 3x Al 5 o 12-1.5x f 3x , x=0.08 stoichiometric ratio, weigh 32.29g of Y 2 o 3 , 25.50g of Al 2 o 3 , 1.03g of CeO 2After fully mixing with 1.39g of KF, put into an agate ball mill jar filled with ethanol and mill for 12 hours. Then the ball-milled slurry was dried in an oven at 90 °C for 12 h. The obtained dry powder was pre-fired in an electric furnace at 1300°C for 6 hours, and then cooled to room temperature naturally. Hand-grind the obtained pre-burned reactant with an agate mortar for 20 minutes to make it fully pulverized, and then put it into a 95% N 2 +5%H 2 Heat to 1500° C. in an electric furnace with a reducing atmosphere, keep warm for 6 hours, cool naturally to room temperature, and grind for 45 minutes to obtain yellow phosphor powder for white LEDs.

Embodiment 2

[0031] According to chemical formula Y 2.94-x Ce 0.06 K 3x Al 5 o 12-1.5x f 3x , x=0.16 stoichiometric ratio, weigh 31.39g of Y 2 o 3 , 25.50g of Al 2 o 3 , 1.03g of CeO 2 And the KF of 2.79g, after fully mixing, put into the agate ball mill jar that fills ethanol and ball mill for 12h. Then the ball-milled slurry was dried in an oven at 90 °C for 12 h. The obtained dry powder was pre-fired in an electric furnace at 1300°C for 6 hours, and then cooled to room temperature naturally. Hand-grind the obtained pre-burned reactant with an agate mortar for 20 minutes to make it fully pulverized, and then put it into a 95% N 2 +5%H 2 Heat to 1500° C. in an electric furnace with a reducing atmosphere, keep warm for 6 hours, cool naturally to room temperature, and grind for 45 minutes to obtain yellow phosphor powder for white LEDs.

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Abstract

The invention discloses a yellow fluorescent powder used for white light LED, a chemical formula is Y2.94-xCe0.06K3xAl5O12-1.5xF3x, wherein x is greater than 0 and less than or equal to 0.24. The invention also discloses a preparation method, which comprises the following steps: weighting raw materials according to stoichiometric ratio, fully mixing and then adding ethanol, performing ball milling to obtain a slurry; drying the slurry and pre-burning for 3-12 hours under 1200-1400 DEG C, naturally cooling to room temperature to obtain a pre-burning reactant; grinding the pre-burning reactant under reducing atmosphere and heating to 1500-1600 DEG C, insulating for 5-12 hours, naturally cooling to room temperature; and grinding to obtain the yellow fluorescent powder used for white light LED. The emmission spectrum center of the yellow fluorescent powder enables maximum bathochromic shift to 585nm from 540nm. The doped raw material KF has low cost, has flux effect for increasing emission intensity.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a yellow fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] In the 1990s, Nichia Corporation of Japan successfully developed high-efficiency blue LEDs, which were combined with yellow phosphors to form white light sources. The technical principle is to use the blue light emitted by the blue LED chip to irradiate the yellow phosphor to make it emit yellow light, and then the yellow light is combined with part of the blue light emitted by the chip to obtain a white light source. [0003] The prior art has proven that Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce) yellow phosphor has a quantum efficiency as high as 90%, and is a highly efficient and low-cost yellow phosphor, which is generally obtained through a solid-phase synthesis reaction method above 1600°C. However, the traditional YAG:Ce yellow phosphor has an emission wavelength center o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 吴磊殷江徐波
Owner NANJING UNIV
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