Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
A group of phosphors is described herein which consist of single- crystal particles in which more than one activator is incorporated in different layers of the same crystal particle, forming a so-called "onion-skin" structure. These phosphors are useful for beam-penetration color CRTs, particularly for small projection systems where improved resolution as well as high light emission is required. The fine and well-crystallized phosphors described below meet these requirements. A method for making such phosphors is also set forth. Previously, phosphors with onion-skin structure were prepared by coating small phosphor particles on large-core phosphor particles. Obviously, such a process has various problems in itself.