PHOSPHORS.

Abstract

A group of phosphors is described 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 meet these requirements. A method for making such phosphors is set forth.