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Method for increasing color saturation of yellow fluorescent powder used for LED (light-emitting diode)

A technology of yellow phosphor and saturation, which is applied in the field of increasing the color saturation of yellow phosphor for LED, which can solve the problem of weakening of the luminous intensity of yellow phosphor, and achieve the effect of increased color saturation, regular appearance and smooth surface

Active Publication Date: 2012-10-03
英特美光电(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the doping of the above rare earth elements will cause the luminous intensity of YAG: Ce yellow phosphor to be greatly weakened.

Method used

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  • Method for increasing color saturation of yellow fluorescent powder used for LED (light-emitting diode)
  • Method for increasing color saturation of yellow fluorescent powder used for LED (light-emitting diode)
  • Method for increasing color saturation of yellow fluorescent powder used for LED (light-emitting diode)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Raw material selection: first use the air-flow grading sieve to classify the particle size of all raw materials, select the raw materials with a central particle diameter D50 of 5-6 μm, weigh the raw materials according to the stoichiometric ratio, and the matrix material is Y 2 o 3 、Al 2 o 3 , CeO 2 , Flux selection composite flux, that is, calcium carbonate (accounting for 0.5% by weight of the matrix raw material YAG), magnesium fluoride (accounting for 0.1% by weight of the matrix raw material YAG), boric acid (accounting for 0.1% by weight of the matrix raw material YAG) ;

[0022] (2) Mixing: Pour the above-mentioned raw materials into the mixing tank (the tank is filled with deionized water whose mass is 1 times that of the raw materials, and several agate balls of different sizes), mix the materials for 24 hours, take them out and ultrasonically disperse them at room temperature ;

[0023] (3) Burning: Sinter the uniformly mixed raw materials in a reduc...

Embodiment 2

[0028] (1) Raw material selection: first use the air-flow grading sieve to classify the particle size of all raw materials, select the raw materials with a central particle diameter D50 of 5-6 μm, weigh the raw materials according to the stoichiometric ratio, and the matrix material is Y 2 o 3 、Al 2 o 3 , CeO 2 , Flux selection composite flux, namely calcium carbonate (accounting for 2% by weight of the matrix raw material YAG), magnesium fluoride (accounting for 0.8% by weight of the matrix raw material YAG), boric acid (accounting for 0.5% by weight of the matrix raw material YAG) ;

[0029] (2) Mixing: Pour the above raw materials into the mixing tank (the tank is filled with deionized water 1.5 times the quality of the raw materials, and a number of agate balls of different sizes), mix for 24 hours, take out and ultrasonically disperse at room temperature ;

[0030] (3) Burning: Sinter the uniformly mixed raw materials in a reducing atmosphere at 1450oC for 6 hours; ...

Embodiment 3

[0035] (1) Raw material selection: first use the air-flow grading sieve to classify the particle size of all raw materials, select the raw materials with a central particle diameter D50 of 5-6 μm, weigh the raw materials according to the stoichiometric ratio, and the matrix material is Y 2 o 3 、Al 2 o 3 , CeO 2 , Flux selection composite flux, that is, calcium carbonate (accounting for 5% by weight of the matrix raw material YAG), magnesium fluoride (accounting for 2% by weight of the matrix raw material YAG), boric acid (accounting for 1% by weight of the matrix raw material YAG) ;

[0036] (2) Mixing: Pour the above raw materials into the mixing tank (the tank is filled with deionized water twice the quality of the raw materials, and a number of agate balls of different sizes), mix for 24 hours, take out and ultrasonically disperse at room temperature ;

[0037](3) Burning: Sinter the uniformly mixed raw materials in a reducing atmosphere at 1250oC for 10 hours;

[003...

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Abstract

The invention discloses a method for increasing color saturation of yellow fluorescent powder used for a light-emitting diode (LED) on the premise of not sharply decreasing the luminance of the fluorescent powder. The method comprises the steps of adjusting the proportion of red light components and blue light components in an emission spectrum of the yellow fluorescent powder to some extent, improving the smooth degree of the surfaces of composite powder particles, selecting raw materials, mixing, burning and crushing the selected materials, rolling the materials to powder, sieving, secondary sintering, cleaning and drying the powder, and the like. The finished product of yellow fluorescent powder used for the LED has the advantages that the appearance is regular, the surfaces of powder particles are smooth, the liquidity is good, the powder is easy to be evenly dispersed in packaging glue, and especially, the CIE (International Commission on Illumination) coordinate of the power is improved, namely the color saturation of the powder is improved.

Description

technical field [0001] The invention belongs to the technical field of LED fluorescent powder, and relates to a method for increasing the color saturation of yellow fluorescent powder for LEDs. Background technique [0002] In 1997, Nichia Chemical Co., Ltd. used blue light InGaN / GaN chips to coat YAG: Ce yellow phosphors, and the yellow light emitted by the phosphors mixed with the blue light emitted by InGaN / GaN chips to form white light. The luminescent color of the white LED device obtained by this method changes with the change of the driving voltage and the thickness of the phosphor coating, the color reproduction is poor, and the color rendering index is low. The main reason is that the blue part of the emission spectrum of the YAG phosphor is too large. More or insufficient red components, that is, the ratio of red light and blue light in the emission spectrum is too low. Many researchers try to develop other phosphors to replace YAG phosphors, such as nitrogen oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00
Inventor 师丽丽顾竟涛邓丽君陈延兵谢玉明李依群
Owner 英特美光电(苏州)有限公司
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