Method for preparing small-particle-size cerium-activated yttrium aluminum garnet (YAG) florescent powder

A technology of yttrium aluminum garnet and phosphor powder is applied in the field of preparing small particle size cerium-activated yttrium aluminum garnet phosphor powder, which can solve the problems such as difficulty in guaranteeing light color consistency of white light LED, inability to apply, and complicated process.

Active Publication Date: 2015-11-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the particle size of commercial YAG phosphors is generally around 10-20 μm, and the particles are too coarse. Not only is it difficult to control the sedimentation of phosphor particles during the packaging process, but it also leads to complex processes and low yields. At the same time, it is difficult to guarantee the light color consistency of white LEDs. , uneven light color
Commercial YAG powder is prepared by high-temperature solid-phase method, the synthesis temperature is high, the reaction process is complicated, and the prepared phosphor particles are coarse
However, YAG phosphors prepared by sol-gel method and chemical precipitation method cannot be applied due to poor crystallinity and low luminous efficiency.
So far, there are no commercial products of small particle size YAG phosphors with a particle size of less than 3 μm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh Al with a particle size of 3 μm 2 o 3 Y powder 0.5 mole, particle size 50nm 2 o 3 Powder 0.293 mol, CeO particle size 50nm 2 0.007 moles of powder, 117 grams of anhydrous sodium chloride, fully mixed and put into a corundum crucible, under a weak reducing atmosphere, heat up to 900°C for 3 hours, then continue to heat up to 1400°C for 3 hours, take it out after cooling, and put The product is washed with deionized water, dispersed by weak ball milling, washed with deionized water until neutral, dehydrated, and dried to obtain a small particle size YAG:Ce phosphor. The phosphor particle size is about 1.5 μm.

Embodiment 2

[0026] Weigh Al with a particle size of 5 μm 2 o 3 Y powder 0.5 mole, particle size 50nm 2 o 3 Powder 0.297 mol, CeO particle size 50nm 2 0.003 moles of powder, 117 grams of anhydrous sodium chloride, fully mixed and put into a corundum crucible, under a weak reducing atmosphere, heat up to 900°C for 3 hours, then continue to heat up to 1400°C for 3 hours, take it out after cooling, and put The product is washed with deionized water, dispersed by weak ball milling, washed with deionized water until neutral, dehydrated, and dried to obtain a small particle size YAG:Ce phosphor. The phosphor particle size is about 1.7 μm.

Embodiment 3

[0028] Weigh Al with a particle size of 0.5 μm 2 o 3 Y powder 0.5 mole, particle size 50nm 2 o 3 Powder 0.285 mol, CeO particle size 50nm 20.015 moles of powder, 117 grams of anhydrous sodium chloride, fully mixed and put into a corundum crucible, under a weak reducing atmosphere, heat up to 900°C for 3 hours, then continue to heat up to 1400°C for 3 hours, take it out after cooling, and put The product is washed with deionized water, dispersed by weak ball milling, washed with deionized water until neutral, dehydrated, and dried to obtain a small particle size YAG:Ce phosphor. The phosphor particle size is about 1.2 μm.

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Abstract

The invention discloses a method for preparing small-particle-size cerium-activated yttrium aluminum garnet (YAG) florescent powder. According to the method, first, in fused salt, a wrapping structure of nanometer yttrium oxide (cerium oxide) @ aluminum oxide particles is obtained through controlled synthesis, then the aggregate of small-particle YAG florescent powder particles is generated through reaction in high-temperature fused salt, and finally the small-particle-size YAG: Ce florescent powder is obtained through weak ball milling. It is avoided that in the reaction process, the aluminum oxide particles and intermediate-phase particles abnormally grow, and while the high crystallinity of the particles is kept, final YAG is effectively controlled; the particle size of the Ce florescent powder has important significance for improving light-color quality of white-light LEDs, lowering the complexity of a white-light LED packaging technology and increasing the yield.

Description

technical field [0001] The invention belongs to the field of photoelectric materials, and relates to a method for preparing cerium-activated yttrium aluminum garnet fluorescent powder with small particle diameter. Background technique [0002] Ce 3+ Activated yttrium aluminum garnet yellow phosphor (Y 3 al 5 o 12 :Ce, or YAG:Ce) has high luminous efficiency and pure light color, and is one of the important components of commercial white LEDs. [0003] The particle size of phosphor powder has a great influence on the light color performance of white light LED. The light-scattering ability of small particle size phosphor is stronger, and the spatial distribution of LED light color is more uniform. Moreover, the settling speed of the phosphor powder with small particle size in the encapsulant is slow, which can greatly reduce the settling degree of the phosphor powder during the encapsulation process. The difficulty of process control improves the yield rate and reduces p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 董岩吕娇虞文奇邵起越蒋建清
Owner SOUTHEAST UNIV
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