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Fluorescent powder for white LED and its prepn process

A technology of light-emitting diodes and phosphors, applied in luminescent materials, chemical instruments and methods, the use of gas discharge lamps, etc., can solve the problems of low brightness of ordinary lighting, low luminous brightness and lumen efficiency, and achieve good and consistent light absorption effect. The effect of good performance and cost reduction

Inactive Publication Date: 2007-03-21
王锦高
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of quasi-spherical and quasi-spherical with high light conversion efficiency, aiming at the low luminous brightness and lumen efficiency of existing light-emitting diode phosphors at home and abroad, and the shortcomings of low brightness when applied to general lighting. Semiconductor lighting white light emitting diode fluorescent powder with crystalline structure and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) The raw material is selected from Y 2 o 3 、Gd 2 o 3 , CeO 2 , Tb 4 o 7 、Pr 6 o 11 、Dy 2 o 3 、Al 2 o 3 , Ga 2 o 3 , its composition and content according to (Y 1-x Gd x ) 3-z (Al 1-y Ga y ) 5 o 12 : Ce z 3+ , where x is 0mol / mol, y is 0.45mol / mol, z is 0.12mol / mol, Y, Gd, Al, and Ga are all matrix cations and anions, and the activators include rare earth activators Ce 3+ and other co-activators praseodymium (Pr), the concentration of praseodymium is Ce 3+ 10%, the purity of the raw material is 4N, and the particle size is 1.5 μm.

[0035] 2) After taking out the raw materials, the precursor can be prepared by homogeneous precipitation method, the pH value of the homogeneous precipitation is controlled to 6.5, the precipitation agent is ammonia water, and Al(OH) with a concentration of 1.2mol / L is added 3 , and stirring, control the temperature of the solution system at 90°C until co-precipitation occurs, and the precipitate becomes the precurso...

Embodiment 2

[0041] Similar to Example 1, the raw material is selected from Y 2 o 3 、Gd 2 o 3 , CeO 2 , Tb 4 o 7 、Pr 6 o 11 、Dy 2 o 3 、Al 2 o 3 , Ga 2 o 3 , its composition and content according to (Y 1-x Gd x ) 3-z (Al 1-y Ga y ) 5 o 12 : Ce z 3+ , where x is 0.2mol / mol, y is 0.55mol / mol, z is 0.1mol / mol, Y, Gd, Al, and Ga are all matrix cations and anions, and the activators include rare earth activators Ce 3+ and other co-activators terbium (Tb), the concentration of terbium is Ce 3+ 8%, the raw material purity is 5N, and the particle size is 2 μm. After the raw material is taken out, the homogeneous precipitation method can be used to control the pH value of the homogeneous precipitation to be 8. The precipitation agent is ammonia water, and Al(OH) with a concentration of 0.6mol / L is added. 3 , and stirred, the temperature of the solution system was controlled to 75°C until coprecipitation occurred. After centrifugation, washing, filtration and drying, the prec...

Embodiment 3

[0043] Similar to Example 1, the raw material is selected from Y 2 o 3 、Gd 2 o 3 , CeO 2 , Tb 4 o 7 、Pr 6 o 11 、Dy 2 o 3 、Al 2 o 3 , Ga 2 o 3 , its composition and content according to (Y 1-x Gd x ) 3-z (Al 1-y Ga y ) 5 o 12 : Ce z 3+ , where x is 0.3mol / mol, y is 0.25mol / mol, z is 0.06mol / mol, Y, Gd, Al, and Ga are all matrix cations and anions, and the activators include rare earth activators Ce 3+ and other co-activators Dysprosium (Dy), the concentration of Dysprosium is Ce 3+ 7%, the raw material purity is 5N, and the particle size is 1 μm. After the raw material is taken out, the homogeneous precipitation method can be used to control the pH value of the homogeneous precipitation to 7, the precipitation agent is ammonia water, and Al(OH) with a concentration of 1.0mol / L is added 3 , and stirred, the temperature of the solution system was controlled to 80°C until coprecipitation occurred. After centrifugation, washing, filtration and drying, the p...

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Abstract

The present invention is fluorescent powder for white LED and its preparation process, and the fluorescent powder has torispherical structure and high light converting efficiency. The fluorescent powder has the composition of (Y1-xGdx)3-z(Al1-yGay)5O12:Cez3+, with the activator including RE activator Ce3+ and other activator. The preparation process includes preparing torispherical precursor of granularity of 1-2 micron, adding flux into the precursor, synthesis in H2 / N2, acid prickling, alkali washing, water washing, crushing, sieving, detecting and packing. The fluorescent powder has high light emitting efficiency and light flux up to 80 lm / w.

Description

technical field [0001] The invention relates to a luminescent material fluorescent powder, in particular to a fluorescent powder of a semi-conductor lighting white light emitting diode with high luminous efficiency, a luminous flux of more than 80 lm / w, and a spherical or quasi-spherical crystal structure and a preparation method thereof. Background technique [0002] A relatively mature method for preparing white light-emitting diodes is to coat a blue-light chip with YAG phosphor powder and package it. The internal quantum efficiency of the blue chip, the light extraction efficiency of the package, and the light conversion efficiency of the phosphor determine the light efficiency of the white light-emitting diode, and the light conversion efficiency of the phosphor is very important. [0003] After Nichia invented GaN blue light technology in 1996, it was found that blue LED combined with yttrium aluminum garnet produced white light, and applied for YAG patents (US5998925,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/00H01L33/50
CPCC09K11/7774H01L33/502Y02B20/181Y02B20/00
Inventor 王锦高王欣
Owner 王锦高
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