PROCESS FOR PREPARING RED FLUORESCENT POWDER OF LOW EUROPIUM CONTENT

摘要

Disclosed is a process for preparing a red fluorescent powder of a low europium content, which comprises having an yttrium-europium oxide powder dispersed and co-precipitated in a weak alkaline solution; adding, under stirring, a water-soluble solution of europium salt into the weak alkaline solution to have the europium element therein precipitated; washing and drying by baking the precipitate and then firing the same for one hour at 800-1000°C to obtain a pre-fired powder; having the pre-fired powder sintered for 2 to 4 hours at 1300-1500°C, and having the sintered solid ground, washed and dried by baking, so as to obtain the red fluorescent powder. The process of the present invention has effectively improved the utilization of europium and reduced the amount of europium used. By using the red fluorescent powder prepared in the process of the present invention, the amount of the europium used can be reduced significantly and the overall costs thereof can be reduced by 10% under the premise of not reducing or only slightly reducing the light-emitting performance of the fluorescent powder.