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Multi-wavelength-excited high-performance red fluorescent powder and preparation method thereof

A red phosphor, high-performance technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low luminous efficiency and high luminous efficiency, and achieve simple preparation process, low synthesis temperature, good chemical stability and thermal stability sexual effect

Inactive Publication Date: 2015-11-11
FOSHAN CITY NANHAI DISTRICT LIANHE GUANGODNG XINGUANGYUAN IND INNOVATION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, among the current three-color phosphors, yellow and blue phosphors are relatively mature in technology and have high luminous efficiency, while the commonly used red phosphors not only have low luminous efficiency, but also suppress the overall packaged light when they are combined with yellow phosphors. Although the light effect of beads can improve the color rendering of the light source to a certain extent, the luminous efficiency sacrificed is very significant.

Method used

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  • Multi-wavelength-excited high-performance red fluorescent powder and preparation method thereof
  • Multi-wavelength-excited high-performance red fluorescent powder and preparation method thereof
  • Multi-wavelength-excited high-performance red fluorescent powder and preparation method thereof

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Embodiment 1

[0028] A method for preparing a high-performance red phosphor excited by multiple wavelengths, comprising the following steps:

[0029] 1) SiO according to the doping amount of europium 2 -Y 2 o 3 -TiO 2 The molar fraction of the oxide matrix is ​​9%, and the molar ratio of each oxide in the oxide matrix is: SiO 2 :TiO 2 :Y 2 o 3 =1:0.8:0.2, respectively weigh 3.168g of europium trioxide and 4.518g of diyttrium trioxide, and dissolve them in 6mol / L nitric acid solution.

[0030] 2) Add 27.503g of tetrabutyl titanate and 20.823g of ethyl orthosilicate to the salt solution obtained in step 1), and stir for 3.5 hours under the condition of heating in a water bath at 80°C to form a colloid.

[0031] 3) Put the colloid obtained in step 2) into an oven and bake at 70°C for 55h.

[0032] 4) Raise the temperature of the muffle furnace to 400°C, then put in the dried colloid, raise the temperature to 800°C, and calcinate for 3.5 hours to obtain a white powder.

Embodiment 2

[0034] The difference from Example 1 is that the amount of europium trioxide is 0.88g, and the doping amount of europium is SiO 2 -Y 2 o 3 -TiO 2 2.5% of the oxide matrix mole fraction, and all the other are the same as in Example 1.

Embodiment 3

[0036] The difference from Example 1 is that the amount of europium trioxide is 1.76g, and the doping amount of europium is SiO 2 -Y 2 o 3 -TiO 2 5% of the oxide matrix mole fraction, and all the other are the same as in Example 1.

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Abstract

The invention provides a red fluorescent powder capable of being excited by multiple wavelengths and a preparation method thereof. The fluorescent powder is a europium-doped SiO2-Y2O3-TiO2 composite material. The fluorescent powder can be excited by near-ultraviolet light with the principal wave peak of 387nm or so, blue light with the principal wave peak of 462nm or so and green light with the principal wave peak of 532nm or so to emit red light with the principal wave peak of 616nm or so. The preparation method is implemented by proportionally combining rare-earth ions and an oxide matrix material by a sol-gel process. The method is simple in technical process and easy to operate. The obtained product has stable performance and high luminescence efficiency. The product can be matched with a proper amount of green and blue fluorescent powders, and then coated and packaged outside an InGaN diode to prepare the high-efficiency white-light LED (light-emitting diode) illuminators.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a multi-wavelength excited high-performance red fluorescent powder and a preparation method thereof, and belongs to the technical field of solid light emission. Background technique [0002] At present, there are two main technologies for producing white light LEDs. One is to use ultra-high brightness In-GaN blue LEDs, and a small amount of yttrium aluminum garnet (YAG)-based phosphor is added to the tube core. The blue light of the LED chip is mixed, which has good stability, but its luminescence is more dazzling. At the same time, due to the lack of red light in the spectral components, the color temperature is high and the color rendering is poor. There is also a combination of violet LED chips and three-primary-color fluorescent materials. The color rendering of white LEDs using the combination of violet LED chips and three-primary-color fluorescent mat...

Claims

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Application Information

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IPC IPC(8): C09K11/79
Inventor 贺珂张亚菲宋定洁
Owner FOSHAN CITY NANHAI DISTRICT LIANHE GUANGODNG XINGUANGYUAN IND INNOVATION CENT
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