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Near ultraviolet excited white light fluorescent powder and preparation method thereof

A fluorescent powder and near-ultraviolet technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of white light attenuation, achieve the effects of narrow particle size distribution, uniform particles, and lower reaction sintering temperature

Inactive Publication Date: 2010-12-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research mainly focuses on the three primary color phosphors, but when the three phosphors are mixed together, due to mutual light absorption, white light attenuation is caused to a certain extent

Method used

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  • Near ultraviolet excited white light fluorescent powder and preparation method thereof
  • Near ultraviolet excited white light fluorescent powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0013] According to the chemical formula CaGdAl 3 o 7 :0.03Ce 3+ , 0.19Tb 3+ The mole fraction ratio of the composition weighs CaCO 3 , Gd 2 o 3 , Al 2 o 3 , CeO 2 , Tb 4 o 7 , and weigh 5% of the total weight of the above raw materials H 3 BO 3 As a co-solvent, put all the above-mentioned raw materials in a planetary ball mill for 4 hours, mix well, dry, and pass through a 200-mesh sieve. Put the obtained powder into an alumina crucible, place the crucible in a graphite box, put it into a muffle furnace, and sinter in a reducing atmosphere formed by active graphite powder. The powder is kept at 800°C for 4 hours, and at 1300°C for 6 hours. Hours, cool with the furnace, grind and refine, and pass through a 300-mesh sieve; put it in 50°C water for 15 minutes, let it stand, filter its supernatant, then add it into 50°C water for 15 minutes, let it stand, filter its supernatant , repeat 3 times, take out the precipitate, dry it, and get phosphor powder.

[0014] The...

Embodiment 2

[0017] According to the chemical formula CaY 0.25 Gd 0.75 al 3 o 7 :0.05Ce 3+ , 0.20Tb 3+ The mole fraction ratio of the composition weighs CaCO 3 , Y 2 o 3 , Gd 2 o 3 , Al 2 o 3 , CeO 2 , Tb 4 o 7 , and weighed the total weight of the above raw materials 7% H 3 BO 3 As a co-solvent, put all the above-mentioned raw materials in a planetary ball mill for 4 hours, mix well, dry, and pass through a 200-mesh sieve. Put the obtained powder into an alumina crucible, place the crucible in a graphite box, put it into a muffle furnace, and sinter in a reducing atmosphere formed by active graphite powder. The powder is kept at 900°C for 6 hours, and at 1350°C for 7 hours. Hours, cool with the furnace, grind and refine, and pass through a 300-mesh sieve; put it in 70°C water for 20 minutes, let it stand, filter the supernatant, then add 70°C water for 20 minutes, stand still, filter the supernatant , repeat 3 times, take out the precipitate, dry it, and get phosphor powd...

Embodiment 3

[0020] According to the chemical formula CaY 0.5 Gd 0.5 al 3 o 7 :0.07Ce 3+ , 0.24Tb 3+ The mole fraction ratio of the composition weighs CaCO 3 , Y 2 o 3 , Gd 2 o 3 , Al 2 o 3 , CeO 2 , Tb 4 o 7 , and weigh 5% of the total weight of the above raw materials K 2 CO 3 As a co-solvent, put all the above-mentioned raw materials in a planetary ball mill for 4 hours, mix well, dry, and pass through a 200-mesh sieve. Put the obtained powder into an alumina crucible, place the crucible in a graphite box, put it into a muffle furnace, and put it in a N 2 and H 2 Sintering in a reducing atmosphere formed by a mixed gas with a molar ratio of 95:5, the powder is kept at 800°C for 6 hours, at 1250°C for 8 hours, cooled with the furnace, ground and refined, and passed through a 300-mesh sieve; put into 80°C Sonicate in water for 15 minutes, let it stand still, filter the supernatant, then add water at 80°C and sonicate for 15 minutes, let it stand, filter the supernatant, ...

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Abstract

The invention discloses near ultraviolet excited white light fluorescent powder. The chemical formula of the fluorescent powder is CaY1-zGdzAl3O7: xCe, yTb, wherein x is more than or equal to 0.03 and less than or equal to 0.07, y is more than or equal to 0.05 and less than or equal to 0.24, and z is more than 0 and less than or equal to 1. The fluorescent powder is prepared by adopting a high-temperature solid phase reaction process and combining subsequent treatment processes such as washing, ultrasonic and the like; and the process is simple, has no pollution and has low cost. The excitation wavelength of the prepared fluorescent powder is in a range of 350 to 420 nanometers, the fluorescent powder can be effectively excited by an InGaAsN near ultraviolet LED, and the main peaks of the emission spectrum of the fluorescent powder are at 414 nanometers, 490 nanometers, 544 nanometers, 587 nanometers and 620 nanometers respectively, so the fluorescent powder produces white light; and the fluorescent powder has the advantages of uniform granules, narrow granularity distribution, high luminous brightness, ultraviolet radiation resistance, good chemical stability and thermal stability and the like, and can be packed with the near ultraviolet LED together to realize white light output.

Description

field of invention [0001] The invention relates to a near-ultraviolet excited white light phosphor powder for semiconductor lighting and a preparation method thereof. Background technique [0002] In 1997, Nakamura et al. reported the use of high-efficiency blue light chips combined with Y 3 al 5 o 12 : Ce 3+ Yellow phosphors produce white light. Under high temperature conditions, Y 3 al 5 o 12 : Ce 3+ Yellow phosphor is easy to synthesize, and yttrium aluminum garnet Y 3 al 5 o 12 The structure is stable, and can be effectively excited by the blue light chip to produce high-intensity yellow light, and the white light output can be realized by using the blue light of the chip and the yellow light of the phosphor powder. White LEDs made of blue chips combined with yellow fluorescence are now commercially available. But the Blu-ray chip combined with Y 3 al 5 o 12 : Ce 3+ The white light LED with yellow phosphor powder has a high color temperature and poor colo...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 樊先平林祥乔旭升骆群戴俊崔硕徐黎岭吴立昂徐扬
Owner ZHEJIANG UNIV
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