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Preparation method of singe matrix LED (light-emitting diode) fluorescent powder

A phosphor, single-matrix technology, applied in the field of single-matrix LED phosphor preparation, can solve the problems of low luminous efficiency, the luminous efficiency does not reach practical application value, the effect of the lumen efficiency of the phosphor and the color reproducibility, etc., and achieves high luminous efficiency. , the preparation method is easy to operate, and the preparation method is simple

Inactive Publication Date: 2014-02-05
韦胜国
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Problems solved by technology

However, due to the problems of color reabsorption and ratio control between mixed phosphors, the lumen efficiency and color reproduction of phosphors are greatly affected
As a new type of phosphor material, single-matrix white light phosphor has become a research hotspot due to its advantages of stable color and good color reproduction, but its luminous efficiency is still relatively low. Significance
Kim reported Ba 3 MgSi 2 o 8 : Eu 2+ , Mn 2+ and Sr 3 MgSi 2 o 8 : Eu 2+ , Mn 2+ A series of single-matrix white light phosphors suitable for near-ultraviolet light excitation; followed by M 2 MgSi 2 o 7 : Eu, Dy(M=Ca, Sr), Ca 2 MgSi 2 o 7 : Eu 2+ , Mn 2+ Such as single matrix phosphors have been reported (Chang C K, Chen TM, Appl.Phys.Iett.2007, 90: 161901), eager to make up for the shortage of mixed phosphors, but the synthesis temperature of such silicate matrix phosphors is still high, Luminous efficiency has not yet reached the practical application value

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  • Preparation method of singe matrix LED (light-emitting diode) fluorescent powder

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preparation example Construction

[0017] Such as figure 1 Shown, a kind of single-matrix LED phosphor preparation method comprises the steps:

[0018] SrCO 3 , MgO, BaCO 3 , (NH 4 ) 2 HPO 4 、Eu 2 o 3 According to the mass ratio of 1:1:1:1:1~1:1:1:2:1, put it into an agate mortar and grind it evenly to obtain the precursor;

[0019] Place the obtained precursor in a corundum crucible, put it into a muffle furnace for sintering under the reducing atmosphere provided by activated carbon;

[0020] The sample after sintering is taken out and ground;

[0021] After grinding, put it into the muffle furnace again for sintering, take out and grind after sintering to obtain single-matrix LED phosphor BaSrMg (PO 4 ) 2 :Eu 2+ .

Embodiment 1

[0023] Preparation of 10 g single-matrix LED phosphor BaSrMg (PO 4 ) 2 :Eu 2+ : 10g SrCO 3 , 10g MgO, 10g BaCO 3 , 10g (NH 4 ) 2 HPO 4 , 10g Eu 2 o 3 Put it into an agate mortar and grind it evenly to obtain a precursor; put the obtained precursor in a corundum crucible, put it into a muffle furnace under the reducing atmosphere provided by activated carbon, and the temperature of the muffle furnace is 10°C min -1 The temperature was raised to 800 °C at a constant temperature for 2 hours for sintering; the sintered sample was taken out and ground; after grinding, it was put into the muffle furnace for sintering again, and the muffle furnace was sintered at 10 °C min -1 The temperature was raised to 1000 ° C at a constant temperature for 2 hours. After sintering, it was taken out and ground to obtain a single-matrix LED phosphor BaSrMg (PO 4 ) 2 :Eu 2+ .

Embodiment 2

[0025] Preparation of 10 g single-matrix LED phosphor BaSrMg (PO 4 ) 2 :Eu 2+ : 10g SrCO 3 , 10g MgO, 10g BaCO 3 , 15g (NH 4 ) 2 HPO 4 , 10g Eu 2 o 3 Put it into an agate mortar and grind it evenly to obtain a precursor; put the obtained precursor in a corundum crucible, put it into a muffle furnace under the reducing atmosphere provided by activated carbon, and the temperature of the muffle furnace is 12°C min -1 The temperature was raised to 850°C at a constant temperature for 2.5 hours for sintering; the sintered sample was taken out and ground; after grinding, it was put into the muffle furnace for sintering again, and the muffle furnace was sintered at 12°C min -1 The temperature was raised to 1200 ° C at a constant temperature for 2.5 hours. After sintering, it was taken out and ground to obtain a single-matrix LED phosphor BaSrMg (PO 4 ) 2 :Eu 2+ .

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Abstract

The invention relates to a preparation method of single matrix LED (light-emitting diode) fluorescent powder. The preparation method of the single matrix LED fluorescent powder comprises the following steps: placing SrCO3, MgO, BaCO3, (NH4)2HPO4 and Eu2O3 into an agate mortar, and uniformly grinding, so as to obtain a precursor; placing the precursor obtained in the first step into a corundum crucible, and placing the corundum crucible in a reducing atmosphere provided by activated carbon into a muffle furnace and sintering; taking out a sample after being sintered, and grinding; after grinding, placing the ground sample into the muffle furnace and sintering, taking out the sample after being sintered, and grinding, thus the single matrix LED fluorescent powder BaSrMg(PO4)2:Eu<2+> is obtained. The preparation method of the single matrix LED fluorescent powder is simple and easy to operate and low in cost, and the obtained single matrix LED fluorescent powder has good stability and high luminous efficiency.

Description

technical field [0001] The present invention relates to the technical field of luminescent materials, in particular to a method for preparing single-matrix LED fluorescent powder. Background technique [0002] As a new type of homogeneous light source, white LED has a very broad application prospect in image display, signal indication, lighting, etc. due to its excellent characteristics such as energy saving, environmental protection, long life, and small size. Currently, YAG is usually pumped with a blue InGaN die: Ce 3+ Yellow phosphor to realize white LED. However, since the white light synthesized in this way is composed of the yellow fluorescence of the phosphor and the blue light of the LED, the luminous color of the device changes with the change of the driving voltage and the thickness of the phosphor coating, the color reproduction is poor, and the color rendering index is low. And not resistant to high temperature. In order to solve the above problems, people tr...

Claims

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Application Information

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IPC IPC(8): C09K11/71
Inventor 韦胜国
Owner 韦胜国
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