Co-precipitation method for preparing rare earth cerium ion-doped yttrium aluminum garnet fluorescent powder

Abstract

The invention discloses a co-precipitation method for preparing rare earth cerium ion-doped yttrium aluminum garnet fluorescent powder and relates to fluorescent powder. The method comprises the following steps of: dissolving yttrium oxide powder in excessive concentrated sulfuric acid and mixing dissolved yttrium oxide with solution of cerous nitrate and solution of aluminum nitrate to prepare metal ion solution, wherein the ratio of Y<3+> to Ce<3+> to Al<3+> is 2.94:0.06:5; adding the metal ion solution into a precipitator to obtain a co-precipitate; cleaning, filtering and drying the co-precipitate to obtain a precursor; pre-sintering the precursor to obtain pre-sintered powder; and calcining the pre-sintered powder to obtain the rare earth cerium ion-doped yttrium aluminum garnet fluorescent powder. In the used co-precipitation method, mixing is performed under the ionic condition, so the mixing is more uniform compared with that of a mechanical mixing method, impurity doping possibility is reduced, accurate control of chemical calculation becomes easier and granularity can be controlled according to a reaction condition. The precipitator and the like are preferably selected and the co-precipitation method is implemented to form a pure YAG phase at the temperature of 1,100 DEG C, which is about 500 DEG C lower than that of a conventional high temperature solid phase reaction method.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a method for preparing rare earth cerium ion-doped yttrium aluminum garnet fluorescent powder by a co-precipitation method. Background technique [0002] Fluorescent substances are widely used in fluorescent lamps, cathode ray tubes (Cathode Ray Tube, CRT), fluorescent screens of televisions, and scintillation counters. In recent years, with the wide application of CRTs, the amount of fluorescent substances has also increased. Moreover, fluorescent screens are developing toward large areas and high resolutions, and CRTs also put forward higher requirements for the phosphor materials used. Traditionally used fluorescent materials are single-crystal powders with a particle size of 1-5 μm and a powder shape that tends to be spherical. Today, in order to improve the life of the screen and withstand the impact of higher electron energy, there is a need for Luminescence Efficiency and Brightnes...

AI Technical Summary

Problems solved by technology

The most important thing is that the product is relatively pure and has few impurities, but the high requirements for equipment and operation are the main factors that limit its wide application

For luminous bodies, the most ideal particle shape is spherical. In order to prepare spherical luminescent particles, people have tried many methods, such as spray pyrolysis (Zhou Yonghui, Lin Jun, Yu Min, et al. Progress in luminescent material prepared by spray pyrolysis process[J].Chin.J.Lumin., 2002,23(5):503-508) is one of the most effective and common methods, but the spray pyrolysis method is easy to form hollow particles, and this The hollow state will seriously affect the stability of the fluorescence method, so the use of it to prepare high-performance and high-stability fluorescent materials remains to be studied