COMPOSITION CONTAINING A CORE/SHELL CERIUM AND/OR TERBIUM PHOSPHATE, PHOSPHOR FROM SAID COMPOSITION, AND METHODS FOR PREPARING SAME

摘要

A composition of including particles that have a mineral core and a shell that uniformly covers the mineral core is described. The shell can be made of a cerium and/or terbium phosphate, or optionally with lanthanum. The composition can include potassium at a maximum potassium content of 7000 ppm. A phosphor obtained by calcining the composition at at least 1000° C. is also described.