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Fluorescent material and preparation method thereof

A technology of fluorescent materials and compounds, applied in the field of fluorescent materials for LEDs and their preparation, can solve the problems of poor stability of fluorescent powders, low stability, affecting the life of LED light sources, etc., and achieves high photoexcitation luminous efficiency, Simple preparation method and low cost effect

Inactive Publication Date: 2013-11-27
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the three primary color phosphors, the green phosphor with high luminous efficiency is used as the sulfide phosphor material, which has the problem of low stability, and the LED chip has the advantage of long life, due to the poor stability of the phosphor used , will inevitably affect the life of the LED light source

Method used

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  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Weigh 6.886g of cerium oxide, 7.652g of alumina, 1.869g of terbium oxide, and 12.4g of boric acid, mix them in a ball mill, put the above mixture in a corundum crucible, sinter in air at 950°C for 5h, and cool to After room temperature, it is ground in an agate mortar, and finally the ground product is placed in a box-type high-temperature furnace, at a temperature of 840 ° C, under the condition of a mixture of nitrogen and hydrogen (the volume ratio of nitrogen and hydrogen is 95:5) Reduction and sintering for 2h and cooling to obtain Ce 0.8 Al 3 (BO 3 ) 4 : 0.2Tb borate-based green fluorescent material. like figure 1 As shown, the excitation peak position of the fluorescent material is at 320-340 nm, and the emission peak is 544 nm (equipment used in the test: Shimadzu fluorescence spectrometer RF-5301PC, test conditions: low sensitivity, 1.5 nm slit).

Embodiment 2

[0031] Weigh 7.74 g of cerium oxide, 7.65 g of alumina, 0.932 g of dysprosium oxide, and 12.4 g of boric acid, mix them in a ball mill, put the above mixture in a corundum crucible, sinter in air at 940°C for 8 hours, and cool to Grind in an agate mortar after room temperature, and finally place the ground product in a box-type high-temperature furnace, at a temperature of 820 ° C, under the condition of a mixture of nitrogen and hydrogen (the volume ratio of nitrogen and hydrogen is 95:5) Reduction and sintering for 4h and cooling to obtain Ce 0.9 Al 3 (BO 3 ) 4 : 0.1Dy borate-based white fluorescent material. like figure 2 As shown, the excitation peak position of the fluorescent material is 320-370 nm, and the emission peaks are 460 nm and 570 nm (equipment used in the test: Shimadzu fluorescence spectrometer RF-5301PC, test conditions: low sensitivity, 1.5 nm slit).

Embodiment 3

[0033] Weigh 17.12 g of cerium oxide, 15.3 g of aluminum oxide, 0.0935 g of terbium oxide, and 24.8 g of boric acid, mix them in a ball mill, put the above mixture in a corundum crucible, sinter in air at 930°C for 5 hours, and cool to Grind in an agate mortar after room temperature, and finally put the ground product in a box-type high-temperature furnace, reduce and sinter for 6 hours at a temperature of 800 °C under the condition of carbon powder to obtain Ce 0.995 Al 3 (BO 3 ) 4 : 0.005Tb borate fluorescent material.

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Abstract

The invention provides a fluorescent material having a specific chemical formula of Cel-xAl3(BO3)4:xLn, wherein x is not less than 0.005 and not more than 0.3, and Ln is one or two of Tb and Dy. The invention also provides a method for preparing the fluorescent material, comprising the following steps of: (1) weighing raw materials of corresponding compounds according to a stoichiometric ratio of the composition of the chemical formula; (2) sufficiently mixing the raw materials after the raw materials are ground or ball-milled; (3) carrying out first high temperature sintering on the mixed material; and (4) grinding the material obtained by the first high temperature sintering, carrying out second high temperature sintering, and cooling to obtain the fluorescent material. The preparation method disclosed by the invention comprises two reaction processes of oxidized sintering and reduced sintering, is beneficial to dispersions of rare earth activator ions in a matrix material and is easy for crystals of the fluorescent material to grow up. The fluorescent material prepared by adopting the method has the characteristics of high stability, high excited photoluminescence efficiency and the like.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a fluorescent material for LED and a preparation method thereof. Background technique [0002] With the breakthrough of the third-generation semiconductor material gallium nitride and the advent of blue, green, and white light-emitting diodes, LEDs, known as "the technology that illuminates the future", have gradually entered our daily lives and will lead us to Lighting source. LED light source is a new generation of light source, and there are three main ways to obtain white light LED: a. Blue light LEDs cooperate with yellow phosphors to obtain white light; b. Chips of different colors are packaged together, and white light is generated by mixing each color light; c. The UV LED excites three primary color phosphors to obtain white light. [0003] At present, from the perspective of technology and application, white LEDs on the market are white LEDs ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 周明杰李清涛马文波
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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