Method for preparing yttrium aluminum garnet nanoparticles

Abstract

The invention provides a method for preparing yttrium aluminum garnet nanoparticles, which comprises the following steps: preparing organic sol containing aluminum and yttrium, mixing the organic solwith water-soluble salt, performing standing or centrifuging to precipitate the water-soluble salt, removing superfluous organic sol at the upper part, and keeping the temperature to convert the organic sol into gel; along with evaporation of the solvent, contracting the gel, and coating the surfaces of the water-soluble salt particles with a layer of xerogel film, and calcining a sample at a hightemperature between 600 DEG C and a salt melting point, converting a dried gel film into yttrium aluminum garnet nanoparticles, dispersing and attaching the yttrium aluminum garnet nanoparticles to the surfaces of water-soluble salt particles, cooling, and washing with water to remove the salt, thereby obtaining the yttrium aluminum garnet nanoparticles with favorable dispersity and crystallinity. According to the method, the high-dispersion and high-crystallinity yttrium aluminum garnet nanoparticles can be rapidly prepared in batches, and the method is suitable for preparing LED fluorescentpowder, YAG transparent ceramic and other materials.

Description

technical field [0001] The invention relates to a technology for preparing yttrium aluminum garnet nanoparticles, which belongs to the technical field of nanoparticle material preparation. Background technique [0002] Yttrium aluminum garnet (Y 3 Al 5 o 12 , or YAG) has a cubic structure, no birefringence effect, small high-temperature creep, excellent optical properties and mechanical properties, and has a wide range of influences in LED phosphors, transparent ceramics and other fields. [0003] In the field of LED phosphors, if YAG particles can be reduced to the nanometer scale, its application performance can be greatly improved. When the particle size of YAG phosphor is reduced from the tens of microns of the current commercial powder to the nanoscale, its sedimentation speed in the encapsulant will be slowed down by more than 10,000 times, which can basically eliminate the phenomenon of uneven light and color caused by particle sedimentation. It will greatly impro...

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Problems solved by technology

In the early stage, the project team adopted molten salt isolation method (Chinese patent CN201510543265.0), microemulsion-wrapped salt shell method (Chinese patent CN201610365324.4), salt-containing sol precipitation method (Chinese patent CN201610699775.1), and water-soluble sulfate co-precipitation method (Chinese patent CN201810037875.7), water-soluble salt nanoparticle isolation method (Chinese patent CN201810037620.0) and metal acetylacetonate salt solution impregnation method (2019101041603), but these have complex processes, uneven particle size or It is impossible to synthesize YAG with pure and equal defects, and it is difficult to prepare highly dispersed YAG nanoparticles on a large scale

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