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LED uses blue light to excite green phosphor and preparation method thereof

A green fluorescent powder and blue light excitation technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of limiting the application and development of high color rendering LED lighting, unsatisfactory indicators, and uneven quality. Ease of implementation and mass production, promotion of popularization and application, and easy process steps

Inactive Publication Date: 2016-05-11
RAYPOWER OPTOELECTRONICS SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Although the white light produced by the superposition of blue light and yellow light in traditional LED lighting has high brightness, its color rendering is not good. In order to improve the color rendering, green and red phosphors need to be added
At present, the production requirements of green silicate phosphors excited by blue light are high, and the process control is difficult, resulting in uneven quality and unsatisfactory indicators, which limits the application and development of high color rendering LED lighting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: The chemical composition of the green phosphor excited by blue light for LED is Lu 2.98 Gd 0.01 Al 4.99 Sr 0.01 o 12 : Ce 0.01 . Its preparation method comprises the following steps:

[0019] A) Mixing of raw materials: according to the molar ratio of Lu 2 o 3 :Gd 2 o 3 : Al 2 o 3 :SrO:CeO 2 =2.98:0.01:4.99:0.02:0.01 The five compounds were put into a double-cone mixer and mixed for 20 hours.

[0020] B) sintering: the raw materials mixed in step A) are packed into an alumina crucible, 2 Sintering in a high hydrogen reduction furnace with a concentration of 65%, the sintering temperature is 1500°C, and the holding time is 3 hours to obtain a powder;

[0021] C) Crushing: After the powder sintered in step B) is crushed once in the jaw crusher, the rollers are rolled twice in the roller crusher, and then the fluorescent powder that has been rolled is passed through a 150-mesh vibrating sieve to obtain intermediate phosphor;

[0022] D) Cleaning:...

Embodiment 2

[0025] Embodiment 2: same as embodiment 1, difference is: the BaF that is added with 0.5% of raw material mixture gross weight in step A) 2 as a combustion aid.

Embodiment 3

[0026] Embodiment 3: same as embodiment 2, difference is: the mixing time of step A) is 5 hours; Step B) in H 2 The concentration is 85%, the sintering temperature is 1800°C, and the holding time is 5 hours; in step C), the powder is crushed in the jaw crusher for 3 times, and the roller is rolled in the roller crusher for 5 times, and the vibrating screen is 300 mesh; step D ) in which the weight of deionized water is 6 times that of the intermediate fluorescent powder, stir for 40 minutes at a stirring speed of 50 rpm; settle for 50 minutes after the stirring stops; in step E), heat in a hot air circulation oven at 200°C for 20 hours; step The ultrasonic sieve in F) is 800 mesh.

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PUM

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Abstract

The invention discloses a blue-ray excited green phosphor for an LED and a preparation method thereof, wherein a chemical composition of the phosphor is Lu(3-x-y)GdyAl(5-w)MwO12:Cex, wherein M represents Sr or B, and 0.01<=x<=1.00, 0.01<=y<=1.50, and 0.01<=w<=0.10. An excitation emission main peak value of the phosphor of invention lies between 500nm and 560nm, and the phosphor has a reasonable proportion, ideal high luminous efficiency and ideal high temperature stability.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder for LEDs, in particular to a preparation method for blue light-excited green fluorescent powder for LEDs. Background technique [0002] Although the white light produced by the superposition of blue light and yellow light in traditional LED lighting has high brightness, its color rendering is not good. In order to improve the color rendering, green and red phosphors need to be added. At present, the production requirements of blue-light-excited green silicate phosphors are high, and the process control is difficult, resulting in uneven quality and unsatisfactory indicators, thus limiting the application and development of high-color-rendering LED lighting. Contents of the invention [0003] In view of the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a method for preparing green phosphors excited by blue light for LEDs. The developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 牟文斌付成国
Owner RAYPOWER OPTOELECTRONICS SUZHOU
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