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Yttrium aluminum garnet fluorescent powder for white light-emitting diode (LED) and preparation method thereof

A yttrium aluminum garnet, yttrium aluminum garnet type technology, applied in the field of white light LED, can solve the problems of low color rendering index, unsuitable for white light LED, unable to express the original color of the item well, etc.

Inactive Publication Date: 2013-09-18
CHANGZHOU INST OF CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of strong emission in the red light region, the blue light excites the yellow phosphor to produce white light, and the LED has a low color rendering index, cannot well represent the original color of the item, and has a high color temperature (>4500K), etc. Shortcomings greatly limit its application in the field of white LED lighting
[0003] The yellow fluorescent material (Tb3-a-bMaCeb)(Al5-cMc)Ol2 (CN1927996) applied by Beijing Yuji Technology Development Co., Ltd. for white light LED wavelength tunable, has the yttrium aluminum garnet crystal structure, and the wavelength is 430 -480nm blue light excitation light source, such as LED, can emit bright yellow fluorescence with a wavelength of 538-585nm. The preparation method is co-precipitation method, and the particle size can reach several microns, which is just suitable for low-power LEDs, but Due to the use of organic precipitants in the reaction, improper post-treatment will cause harm to the environment
[0004] The invention patent (CN1888012) applied by Peking University, by adding Sb and Bi to the YAG:Tb fluorescent material to form a co-activation based on energy transfer mechanism, greatly improves the luminous performance of the fluorescent material, and the wavelength of the emitted light No change, it can be used in devices and devices that stimulate luminescence by cathode ray, but the peak width of the emission spectrum is too narrow (10nm), not suitable for use as a white LED

Method used

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  • Yttrium aluminum garnet fluorescent powder for white light-emitting diode (LED) and preparation method thereof
  • Yttrium aluminum garnet fluorescent powder for white light-emitting diode (LED) and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] According to the Y2.94Ce0.06Mg2.5Al3Si2.5Ol2 stoichiometric ratio, weigh 1.12g hydrated yttrium carbonate, 1.186g magnesium nitrate, 2.082g aluminum nitrate, 0.0482g cerium nitrate, 0.565g sodium silicate, and dissolve various raw materials in An aqueous solution is formed in water, and the aqueous solution is placed in a planetary ball mill for wet grinding to make it evenly mixed.

[0024] Take out the ball-milled solution, heat and stir at 120°C, evaporate the water, pass through a 200-mesh sieve to form a precursor powder, add composite flux BaF2 and boric acid to the precursor powder, a total of 0.15g, and put Put it into a ball mill for dry mixing, make it evenly mixed, burn the mixed raw materials in the air at 1550°C for 4 hours, take it out when it drops to 200°C, crush, finely crush, sieve, and then reduce it in activated carbon at 1500°C. The crushed and ball-milled phosphor powder is then burnt and reduced in a high-hydrogen reduction furnace at 1000°C. The ...

Embodiment 2

[0026] According to the Y2.94Ce0.06Mg2.5Al3Si2.5Ol2 stoichiometric ratio, weigh 1.12g hydrated yttrium carbonate, 1.186g magnesium nitrate, 2.082g aluminum nitrate, 0.0482g cerium nitrate, 0.565g sodium silicate, and dissolve various raw materials in An aqueous solution is formed in water, and the aqueous solution is placed in a planetary ball mill for wet grinding to make it evenly mixed.

[0027] Take out the ball-milled solution, heat and stir at 120°C, evaporate the water, pass through a 200-mesh sieve to form a precursor powder, add composite flux BaF2 and boric acid to the precursor powder, a total of 0.2g, and put Put it into a ball mill for dry mixing, make it evenly mixed, burn the mixed raw materials in the air at 1550°C for 4 hours, take it out when it drops to 200°C, crush, finely crush, sieve, and then reduce it in activated carbon at 1500°C. The crushed and ball-milled phosphor powder is then burnt and reduced in a high-hydrogen reduction furnace at 1000°C. The r...

Embodiment 3

[0029] According to the Y2.94Ce0.06Mg2.5Al3Si2.5Ol2 stoichiometric ratio, weigh 1.12g hydrated yttrium carbonate, 1.186g magnesium nitrate, 2.082g aluminum nitrate, 0.0482g cerium nitrate, 0.565g sodium silicate, and dissolve various raw materials in An aqueous solution is formed in water, and the aqueous solution is placed in a planetary ball mill for wet grinding to make it evenly mixed.

[0030] Take out the ball-milled solution, heat and stir at 120°C, evaporate the water, pass through a 200-mesh sieve to form a precursor powder, add composite flux BaF2 and boric acid to the precursor powder, a total of 0.25g, and put Put it into a ball mill for dry mixing, make it evenly mixed, burn the mixed raw materials in the air at 1600°C for 4 hours, take it out when it drops to 200°C, crush, finely crush, sieve, and reduce it in activated carbon at 1500°C. The crushed and ball-milled phosphor powder is then burnt and reduced in a high-hydrogen reduction furnace at 1000°C. The reduc...

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Abstract

The invention discloses yttrium aluminum garnet fluorescent powder for a white light-emitting diode (LED) and a preparation method thereof and in particular orange fluorescent powder for the LED. The fluorescent powder has the stoichiometric formula of Y2.94Ce0.06Mg[2.5-x]Al[3+2x]Si[2.5-x]O12, wherein x is more than or equal to 0 and less than or equal to 0.4. The prepared fluorescent material has the crystal structure of yttrium aluminum garnet, and when the fluorescent material is excited by the blue light with the wavelength of 450-475nm, orange light with the wavelength of 560-650nm can be emitted. The invention also discloses a method for preparing the fluorescent powder.

Description

technical field [0001] The invention relates to a yttrium aluminum garnet fluorescent powder, which is mainly used in the field of white light LEDs. The invention also relates to a preparation method of the fluorescent powder. Background technique [0002] Since Japan's Nichia Corporation successfully developed the first white LED in 1993, white LEDs have rapidly entered the fields of automobiles, personal communication equipment, LCD backlight and lighting with the characteristics of high efficiency, energy saving, shock resistance and environmental protection. The white light LED uses a GaN-based blue light LED with a wavelength of 450nm-480nm to irradiate yellow-emitting YAG:Ce3+ phosphor powder, and then uses the lens principle to mix the remaining blue light with the yellow light emitted by the phosphor powder to produce white light. YAG:Ce3+ phosphor has become the preferred material for white LEDs due to its high luminous efficiency, stable performance, excellent the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 李高锋
Owner CHANGZHOU INST OF CHEM