The Synthesis and particle growth mechanism of bright green phosphor YAG:Tb and its application to CRT phosphors

Abstract

The conventional method of preparing YAG:Tb requires repeated firing to form single-phase cubic material. When a SrF_2, BaF_2, YF_3 or AlF_3 is used as a reaction reagent, however, only a single firing produces single-phase cubic material. The solid-liquid phase reaction occurs during firing are produced between the raw oxide materials as well as other by-products. The particle growth is facilitated by a process in which, small YAG particles first gather in the contact area between large YAG particles where fluoride melts and forms a liquid film, then dissolve and finally precipitate when saturated in order to reduce the surface energy. Using this information about the role of flux on synthesis and the effect of flux on particle growth, efficient phosphors with small-particle sizeand phosphor screen with sharp strie-edge and high packing density could be obtained.