Multi-emission-peak LED (light emitting diode) white light fluorescent powder and preparation method thereof

A multi-emission and fluorescent powder technology, which is applied in the direction of luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, etc., can solve the problem of affecting the light efficiency of the light source, the low conversion efficiency of red and green powder, and the low color rendering index of white light, etc. problems, to achieve the effect of simplifying the process flow, good industrialization prospects and application prospects, and good color rendering

Inactive Publication Date: 2012-07-18
HANGZHOU HANGKE OPTOELECTRONICS
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  • Claims
  • Application Information

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Problems solved by technology

The second scheme has the advantages of simple drive circuit design, easy production, low power consumption, and low cost. It is the mainstream technology of white LEDs at present. However, due to the lack of red components in the phosphor powder, the white light color rendering index obtained Low
The third and fourth schemes can achieve a higher color rendering index and improve the quality of the light source through the combination of various phosphors, but the light conversion efficiency of the red and green powders is not high, which affects the light efficiency of the light source
In addition, in the process of realizing white light, the ratio of various phosphors needs to be considered, and in actual production, different phosphors need to be weighed separately, which increases the complexity of the process

Method used

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  • Multi-emission-peak LED (light emitting diode) white light fluorescent powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0017] (1) According to the chemical formula Sr 1.94 SiO 4 :(Eu 2+ 0.02 , Eu 3+ 0.04 ) Weigh SrCO 3 , SiO 2 and Eu 2 o 3 , and weigh 1% of the mass of the chemical formula SrF 2 As a co-solvent, grind for 360min in a ball mill with a revolution of 30r / min and an autorotation of 700r / min;

[0018] (2) Dry the above mixture and put it into a crucible, place it in a high-temperature tube furnace, and pass H into the tube furnace 2 / N 2 Reducing atmosphere (H 2 volume content 5%), with 5 o The heating rate of C / min raises the furnace temperature to 800 o C kept for 2 hours, then increased to 1400 o C sintering for 3 hours, close the furnace, and the sintered product is cooled to room temperature with the furnace in a reducing atmosphere;

[0019] (3) Take the sintered material out of the furnace and crush it. Wash 5 times with deionized water, and at 135 o Dry in C oven for 5 hours to obtain Sr 1.94 SiO 4 :(Eu 2+ 0.02 , Eu 3+ 0.04 ) alkaline earth metal si...

Embodiment 2

[0022] (1) According to the chemical formula Ba 1.96 SiO 4 :(Eu 2+ 0.02 , Eu 3+ 0.02 ) Weigh BaCO 3 , SiO 2 、Eu 2 o 3 , and weigh BaF which accounts for 2.5% of the mass of the chemical formula 2 As a co-solvent, grind for 45min in a ball mill with a revolution of 350r / min and an autorotation of 60r / min;

[0023] (2) Dry the above mixture and put it into a crucible, place it in a high-temperature tube furnace, and pass H into the tube furnace 2 / N 2 Reducing atmosphere (H 2 volume content 5%). to 5 o The heating rate of C / min raises the furnace temperature to 850 o C is maintained for 4 hours, and then increased to 1500 o C, sinter for 8 hours, close the furnace, and cool the sinter to room temperature with the furnace in a reducing atmosphere;

[0024] (3) Take the sintered product out of the furnace and pulverize it. Washed three times with deionized water, and at 105 o Dry in C oven for 10 hours to get Ba 1.96 SiO 4 :(Eu 2+ 0.02 , Eu 3+ 0.02 ) Alkal...

Embodiment 3

[0027] (1) According to the chemical formula Sr 1.87 Ba 0.1 SiO 4 :(Eu 2+ 0.01 , Eu 3+ 0.02 ) Weigh SrCO 3 、BaCO 3 , SiO 2 、Eu 2 o 3 , and weigh 2% of the mass of chemical formula NH 4 F is used as a co-solvent, and is ground in a ball mill for 150 min with a revolution of 150 r / min and an autorotation of 150 r / min;

[0028] (2) Dry the above mixture and put it into a crucible, place it in a high-temperature tube furnace, and pass H into the tube furnace 2 / N 2 Reducing atmosphere (H 2 volume content 5%). to 5 o The heating rate of C / min raises the furnace temperature to 850 o C is maintained for 4 hours, and then increased to 1500 o C, sintered for 6 hours. After closing the furnace, the sintered product is cooled to room temperature with the furnace in a reducing atmosphere;

[0029] (3) Take the sintered product out of the furnace and pulverize it. Wash 4 times with deionized water, and at 120 o Dry in C oven for 7 hours to get Sr 1.87 Ba 0.1 SiO 4...

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Abstract

The invention relates to a multi-emission-peak LED (light emitting diode) white light fluorescent powder and a preparation method of the multi-emission-peak LED white light fluorescent powder. The chemical formula of the composition of the fluorescent powder is A2-xSiO4:(Eu<2+>x1, Eu<3+>x2), wherein A is one or more of Mg, Ca, Sr, Ba, Zn and Cd, 0<X1<2, 0<X2<2, 0<X<2, and X=X1+X2. The fluorescent powder can be prepared by high-temperature sintering in a reducing atmosphere by a solid-phase reaction method, and the technology is simple. The LED white light fluorescent powder disclosed by the invention is matched with a blue light LED chip; in a spectrum of an obtained white light LED, the fluorescent powder can be excited to generate a broad peak of 500-580nm and narrow-band red light within a range within 585nm to 760nm; and the fluorescent powder has the advantages of high color rendering property and high light luminous efficiency and can be used for preparing a white light LED light source.

Description

technical field [0001] The invention relates to a LED white light fluorescent powder with multiple emission peaks and a preparation method thereof, in particular to an alkaline earth metal silicate fluorescent powder co-activated by trivalent europium and divalent europium, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] Because of its small size, fast response, long life, high reliability, low power consumption, environmental protection and other advantages, LED has been widely concerned, and is considered to be the fourth-generation lighting source that will replace incandescent lamps and fluorescent lamps. [0003] White light is formed by mixing multiple colors, and can also be formed by mixing the three primary colors of red, green and blue. According to the current technical level, white light can be realized through four schemes. The first is to use three red, green, and blue LED chips to achieve white light by co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
CPCY02B20/181Y02B20/00
Inventor 严钱军高基伟徐小秋杨敬葵
Owner HANGZHOU HANGKE OPTOELECTRONICS
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