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Yellow phosphor, preparation method thereof and application thereof in light-emitting devices

A technology of yellow phosphors and light-emitting devices, applied in the directions of light-emitting materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of unfavorable warm white LED output, high color temperature of white LED output, and achieve integrated and integrated design, High production efficiency and stable physical and chemical properties

Inactive Publication Date: 2017-07-25
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 coverage of the red region of the visible light band by Ce:YAG, the white LED output color temperature achieved is high, which is not conducive to the realization of warm white LED output (color temperature <4000 K), and it is necessary to combine some red phosphors to improve its color temperature. Improve the corresponding color rendering index of red light band (R9)

Method used

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  • Yellow phosphor, preparation method thereof and application thereof in light-emitting devices
  • Yellow phosphor, preparation method thereof and application thereof in light-emitting devices
  • Yellow phosphor, preparation method thereof and application thereof in light-emitting devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] One (Ce 0.003 Sc 0.997 ) 2 O 4 Yellow phosphor, the preparation method steps are as follows:

[0040] 1) Based on BaO, Sc 2 O 3 And Ce(NO 3 ) 3 As the initial raw material, it is formulated according to the molar ratio of Ba:Ce:Sc of 1:0.04:1.96, and is dry-mixed for 5 h by planetary ball mill and ground to obtain a powder with uniform particle size distribution;

[0041] 2) Press the mixed powder in step 1) into a cylindrical shape at 40 MPa, put it in a platinum crucible, heat it up to 1300°C at 2~5°C / min, burn it in air at 1300°C for 5 hours, then Reduce to room temperature at 2~5°C / min and grind to obtain as-fired block powder with an average particle size of 0.5~15μm;

[0042] 3) Press the as-fired block powder of step 2) again under 40 MPa into a block, put it in a platinum crucible, and in a reducing atmosphere of CO / Ar (volume ratio 5:90) at 2~5℃ The temperature is increased to 1500℃ for 5 h after the second sintering, and the corresponding block powder is obtained. A...

Embodiment 2

[0044] A kind of Ba(Ce 0.003 Sc 0.997 ) 2 O 4 Yellow phosphor, the preparation method steps are as follows:

[0045] 1) Take BaCO 3 , Sc 2 O 3 And CeO 2 As the initial raw material, the molar ratio of Ba:Ce:Sc is 1:0.006:1.994. The mixture is wet-mixed with an alcohol solution for 1 h, then dried in a fume hood at room temperature and ground to obtain a powder with uniform particle size distribution;

[0046] 2) Press the mixed powder in step 1) into a cylindrical shape at 40 MPa, put it in a corundum crucible, heat it up to 1300°C at 2~5°C / min, and burn it in air at 1300°C for 5 hours, then Reduce to room temperature at 2~5°C / min and grind to obtain as-fired block powder with an average particle size of 0.5~15μm;

[0047] 3) The as-fired block powder of step 2) is pressed again at 40 MPa into a block, put into the corundum crucible, in H 2 / N 2 (Volume ratio is 5:95) In a reducing atmosphere, the temperature is increased to 1500℃ for 5 h at 2~5℃ / min to obtain the corresponding bulk ...

Embodiment 3

[0051] A kind of Ba(Ce 0.003 Sc 0.997 ) 2 O 4 Yellow phosphor, the preparation method steps are as follows:

[0052] 1) Take BaCO 3 , Sc 2 O 3 And CeO 2 As the initial raw material, the molar ratio of Ba:Ce:Sc is 1:0.006:1.994. The mixture is wet-mixed with an alcohol solution for 1 h, then dried in a fume hood at room temperature and ground to obtain a powder with uniform particle size distribution;

[0053] 2) Press the mixed powder in step 1) into a block under 40 MPa, put it in a corundum crucible, heat it up to 1300℃ at 2~5℃ / min, first burn it in air at 1300℃ for 5 hours, and then 2~5℃ / min down to room temperature and grinding to obtain as-fired block powder with average particle size of 0.5~15μm;

[0054] 3) Press the as-fired block powder of step 2) into a cylindrical shape again under 40 MPa, put it in a corundum crucible, 2 / N 2 (Volume ratio is 5:95) In a reducing atmosphere, the temperature is increased to 1600℃ for 5 h at 2~5℃ / min to obtain the corresponding bulk powder, ...

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Abstract

The invention discloses yellow phosphor, a preparation method thereof and application thereof in LED lighting field, and belongs to the field of preparation and application of light-emitting materials. The composition expression of the yellow phosphor is Ba(CexSc1-x)2O4, with 0<x< / =0.5. The yellow phosphor is prepared by preparing Ba source, Ce source and Sc source compounds according to the molar ratio of Ba:C3:Sc=1:2x:(2-2x), mixing, briquetting, sintering initially, briquetting, sintering secondarily, and grinding. By combining a diode chip having emission wavelength of 430-460 nm and the above yellow phosphor, it is possible to prepare a white LED light-emitting device. The yellow phosphor and the manufacture process of its related light-emitting devices have the advantages that the manufacture process is simple and is easy to perform, integrated design of the devices is facilitated, and the yellow phosphor and the manufacture process have the potential of industrial and batch production.

Description

Technical field [0001] The invention belongs to the field of luminescent materials and their preparation, and relates to a yellow phosphor, a preparation method and its application in a light-emitting device. Background technique [0002] Compared with traditional incandescent and fluorescent lighting, white LED lighting, as a new generation of lighting source, has the advantages of low power consumption, long life, fast response speed, and small size. It has become the key development direction of today's lighting field. At present, there are generally two implementation methods for white LEDs: 1. Realize by combining three LEDs, red, green and blue. Although this method can achieve white light output with different color temperatures, the cost is relatively high. 2. A single blue or ultraviolet LED is used in combination with corresponding phosphors to achieve light emission in different color temperature regions. This kind of method can not only effectively reduce the design...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7769H01L33/501
Inventor 王树贤叶正茂刘树新张广刚
Owner UNIV OF JINAN
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