Method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder

The invention provides a method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder. Carbonate precursor particles of YAG are dispersed and isolated with nano potassium sulfate in xylene, after centrifugal precipitation, precipitates are dried and then calcined at the high temperature, a calcined product is secondarily calcined in the reduction atmosphere, and high-dispersity nanoYAG fluorescent powder with good light emitting performance can be obtained after water washing. By means of the method, the nano YAG fluorescent powder with good dispersity and perfect crystals can be rapidly prepared in batches. The fluorescent powder can be made into transparent fluorescent gelatin, light scattering loss is eliminated, and the problem of inconsistency of light color of a white-light LED due to settlement can be solved. 本发明提供种制备纳米钇铝石榴石荧光粉的方法，在二甲苯中使用纳米硫酸钾对YAG的碳酸盐前驱体颗粒进行分散并隔离，离心沉淀后，将沉淀物烘干后进行高温煅烧，再将煅烧产物在还原气氛中二次煅烧，水洗后可得高分散的、发光性能优良的纳米YAG荧光粉。本发明可以快速批量制备出分散性好、结晶完善的纳米YAG荧光粉，该荧光粉可以做成透明荧光胶，不仅消除光散射损失，还可以解决因沉降导