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Yellow light fluorescent powder for white light LED and preparation method thereof

A yellow fluorescent powder and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of increased design difficulty and cost consumption, unfavorable warm white LED lighting, and high color temperature of white LEDs, and achieve integrated The effect of modernized and integrated design, enhanced color rendering index, and high luminous efficiency

Inactive Publication Date: 2018-07-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of emission in the red band in these phosphors, the color temperature of the white LEDs achieved is high, which is not conducive to the realization of warm white LED lighting (color temperature <4000 K), and it is necessary to combine some red phosphors to improve its color temperature. The corresponding color rendering index (R9) in the red band increases the design difficulty and cost consumption
In contrast, Ce:Tb 3 Al 5 o 12 (TAG) (Osram US6669866 patent) and Ce:Gd 3 Al 5 o 12 The main emission peak of (GAG) yellow phosphor is red-shifted to the long-wave band, which can better improve the R9 color rendering index. However, the low fluorescence quenching temperature limits its application in the field of white LEDs

Method used

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  • Yellow light fluorescent powder for white light LED and preparation method thereof
  • Yellow light fluorescent powder for white light LED and preparation method thereof
  • Yellow light fluorescent powder for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] a Ba 3 Y 4 o 9 : The preparation method of Ce (x=0.2 at. %) yellow phosphor powder is as follows:

[0053] With Ba(NO 3 ) 2 , Y(NO 3 ) 3 and Ce(NO 3 ) 3 As the initial raw material, the molar ratio of Ba:Ce:Y is 3:0.008:3.992 for batching, and each raw material is ball milled for 5 h to obtain a mixed powder with an average particle size of 0.5-5 μm;

[0054] Press the mixed powder into a block at 40 MPa, put it into a platinum crucible, sinter it in the air at 1100°C for 10 h, cool it down to room temperature, and grind it to obtain the first-fired powder with an average particle size of 0.5-15 μm;

[0055] The first-fired powder was pressed into a block at 40 MPa, put into a platinum crucible, sintered at 1600 °C for 6 h in a reducing atmosphere of CO / Ar (volume ratio 5:95), cooled to room temperature, and ground to obtain the final Ba 3 Y 4 o 9 : Ce yellow phosphor, the average particle size is 0.5-15μm. The XRD pattern of the obtained phosphor powder is...

Embodiment 2

[0057] a Ba 3 Lu 4 o 9 : The preparation method of Ce (x=0.2 at. %) yellow phosphor powder is as follows:

[0058] with BaCl 2 、LuCl 3 and CeCl 3 As the initial raw material, the molar ratio of Ba:Ce:Lu is 3:0.008:3.992 for batching, each raw material is wet mixed with alcohol solution for 1 h, dried in a fume hood at room temperature, and ground to obtain an average particle size of 0.5- 5 μm mixed powder;

[0059] Press the mixed powder into a block at 40 MPa, put it into a corundum crucible, sinter in air at 1400°C for 5 h, cool down to room temperature, and grind to obtain a primary-fired powder with an average particle size of 0.5-15 μm;

[0060] The first-fired powder was pressed into a block at 40 MPa, put into a corundum crucible, sintered at 1550 °C for 4 h in a reducing atmosphere of CO / Ar (volume ratio 5:95), cooled down to room temperature, and ground to obtain the final Ba 3 Lu 4 o 9 : Ce yellow phosphor, the average particle size is 0.5-15μm. The XRD p...

Embodiment 3

[0062] a Ba 3 Y 4 o 9 : Ce (x=0.2 at. %, 0.5 at. % and 0.8 at. %) yellow phosphor preparation method, specifically as follows:

[0063] with BaCO 3 , Y 2 o 3 and CeO 2 As the initial raw materials, the molar ratios of Ba:Ce:Y were 3:0.008:3.992, 3:0.02:3.98, 3:0.032:3.968, respectively, and the raw materials were mixed with alcohol solution for 1 h, and used at room temperature After drying in a fume hood, grind to obtain a mixed powder with an average particle size of 0.5-5 μm;

[0064] Press the mixed powder into a block at 40 MPa, put it into a corundum crucible, sinter in the air at 1350°C for 5 h, cool down to room temperature, and grind to obtain a primary-fired powder with an average particle size of 0.5-15 μm;

[0065] The first-fired powder was pressed into a block under 40 MPa, put into a corundum crucible, and heated under H 2 / N 2 (Volume ratio is 5:95) sintered at 1600 ℃ for 4 h in a reducing atmosphere, cooled to room temperature, and ground to obtain th...

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Abstract

The invention discloses yellow light fluorescent powder for a white light LED and a preparation method thereof. A chemical formula is Ba3(CexRe<1-x>)4O9. A solid-phase sintering method is used for preparing the Ba3Re4O9:Ce yellow fluorescent powder; the whole preparation process technology is simplified; the production period is short; the production efficiency is high; the fluorescence emission wavelength of the yellow fluorescent powder covers 475 nm to 750 nm; high luminous efficiency is realized; in addition, the center emission wavelength is about 580 to 600 nm. Compared with Ce:YAG, Ce:TAG and Ce:GAG ( with the center emission wavelength being respectively about 534 nm, 552 nm and 564 nm), the Ba3Re4O9:Ce fluorescent powder can more effectively enhance and improve the corresponding red light waveband color development index (R9); the warm white LED illumination can be favorably realized.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, and relates to a yellow light fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] Today, with the deterioration of the ecological environment and the intensification of energy consumption, people pay more and more attention to the rational use of energy and the research and development of environmentally friendly and energy-saving products. In the field of lighting, white LED lighting has become the first choice for a new generation of lighting due to its advantages such as low power consumption, long service life, small size, high brightness, low heat and green environmental protection. It is used in home decoration, automotive lighting and commercial display. Lamps have been widely used in many fields. At present, there are generally two implementation schemes for commercial white light LEDs: 1. White light is formed by mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
Inventor 王树贤叶正茂马树伟刘树新张广刚
Owner UNIV OF JINAN
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