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Method for growing cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material

A technology of yttrium aluminum garnet and growth method, which is applied in the growth field of cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material, which can solve the problems of component segregation, small size and complexity, and reduce carbon pollution situation, eliminate interface disturbance, and avoid the effect of uneven composition

Active Publication Date: 2012-07-11
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the growth process of doped eutectic materials. The main method is to use a moving crucible to make the raw material melt pass through a temperature gradient zone for directional solidification. This method is relatively complicated due to the need for a transmission device, and mechanical disturbances during the movement will cause solidification. The liquid interface is unstable, causing defects and affecting the quality of eutectic growth
However, the traditional crystal growth methods such as the pulling method and the floating zone method are not suitable for the growth of doped eutectics due to the shortcomings of component segregation and too small size.

Method used

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  • Method for growing cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material
  • Method for growing cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material
  • Method for growing cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material

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Experimental program
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Effect test

Embodiment 1

[0026] The size of the crucible made of molybdenum (Mo) is Φ55 x 150mm, the taper of the crucible bottom is 100°, the raw material ratio parameters are selected as a=0.825, b=0.17325, c=0.0035, and the doping ratio of Ce in the YAG phase is 0.01, That is (Y 0.99 Ce 0.01 ) 3 Al 5 o 12

[0027] α-Al 2 0 3 Powder (purity 99.999%), Y 2 o 3 Powder (purity 99.999%) and CeO 2 Powder (purity 99.999%) as raw material, according to Al 2 o 3 : Y 2 o 3 : CeO 2 =0.825:0.17325:0.0035 Molar ratio Weigh about 300 g of the raw materials in total, wet mix the raw materials in ethanol for 12 hours with a ball mill, and dry the ethanol in an oven to obtain a raw material powder. After pressing and forming with a hydraulic press, it is fired at 1200 ° C for 10 hours and then formed into blocks. Put Al into the seed crystal tank of the crucible in the temperature gradient furnace 2 o 3 Seed crystal, then put in the fired raw material and cover the crucible cover and put it into ...

Embodiment 2

[0031] The size of the crucible made of molybdenum (Mo) is Φ55 x 150mm, the taper of the crucible bottom is 100°, the raw material ratio parameters are selected as a=0.815, b=0.17945, c=0.0111, and the doping ratio of Ce in the YAG phase is 0.03, That is (Y 0.97 Ce 0.03 ) 3 Al 5 o 12

[0032] α-Al 2 o 3 Powder (purity 99.999%), Y 2 o 3 Powder (purity 99.999%) and CeO 2 Powder (purity 99.999%) as raw material, according to Al 2 o 3 : Y 2 o 3 : CeO 2 =0.815: 0.17945: 0.0111 molar ratio A total of about 300 g of raw materials was weighed, wet-mixed with ethanol for 12 hours using a ball mill, and dried in an oven to remove ethanol to obtain a raw material powder. After pressing and forming with a hydraulic press, it is fired at 1200 ° C for 10 hours and then formed into blocks. Put Al into the seed crystal tank of the crucible in the temperature gradient furnace 2 o 3 Seed crystal, then put in the fired raw material and cover the crucible cover and put it into...

Embodiment 3

[0036] The size of the crucible made of molybdenum (Mo) is Φ55 x 150mm, the taper of the crucible bottom is 100°, the raw material ratio parameters are selected as a=0.775, b=0.2115, c=0.027, and the doping ratio of Ce in the YAG phase is 0.06, That is (Y 0.94 Ce 0.06 ) 3 Al 5 o 12

[0037] α-Al 2 0 3 Powder (purity 99.999%), Y 2 o 3 Powder (purity 99.999%) and CeO 2 Powder (purity 99.999%) as raw material, according to Al 2 o 3 : Y 2 o 3 : CeO 2 =0.775: 0.2115: 0.027 molar ratio A total of about 300 g of raw materials was weighed, wet-mixed with ethanol for 12 hours using a ball mill, and dried in an oven to remove ethanol to obtain a raw material powder. After pressing and forming with a hydraulic press, it is fired at 1200 ° C for 10 hours and then formed into blocks. Put Al into the seed crystal tank of the crucible in the temperature gradient furnace 2 o 3 Seed crystal, then put in the fired raw material and cover the crucible cover and put it into the...

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Abstract

The invention relates to a method for growing a cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material. The method comprises the following steps of: creating a reasonable vertical temperature grade environment by using a vertical temperature grade method and different heating power distributions of a heating body; placing a pretreated material into a crucible to heat and fuse; standing a fusant in a temperature field; enabling the fusant to crystallize from the bottom through controlling the sectional cooling processes of speeds; and movably growing the crystal on a solid-liquid interface from bottom to top. Compared with the common directional solidification method, such as bridgman-stockbarger method, in the method for growing the cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material, the possible problem of instable interface is solved due to no mechanical moving parts, and meanwhile the relative doping uniformity of a closed growth system is guaranteed. The cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material grown by the method is stable in quality and has good phototransformation performance, photo-mixing performance and heat resistance and application potential on various light emitting devices, such as large power white light LED (Light Emitting Diode).

Description

technical field [0001] The invention relates to a cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material, in particular to a growth method of the cerium-doped alumina-yttrium aluminum garnet eutectic fluorescent material using a vertical temperature gradient method. Background technique [0002] Light-emitting diode (referred to as LED) light source has the characteristics of high efficiency, energy saving, long life, safety, reliability and environmental protection. It has been widely used in urban lighting environment in recent years. Especially in the context of rising concerns about global energy shortages, the prospect of LED lighting in the lighting market has attracted worldwide attention. [0003] At present, white light at home and abroad mostly adopts single or multiple blue LED chips dot phosphor technology. However, according to this method, it is almost impossible to obtain uniform white light with good repeatability. This is because the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/28C30B11/00C30B28/06C09K11/80
Inventor 夏长泰赛青林司继良李晓清杨卫桥狄聚青许鹏王璐璐
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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