PHOSPHATE OF LANTHANE, CERIUM AND HEART / SHELL-TYPE TERBIUM, LUMINOPHORE COMPRISING THIS PHOSPHATE AND METHODS OF PREPARATION

摘要

The invention relates to a phosphate of the type comprising particles consisting of a mineral core and a shell based on a lanthanum phosphate, cerium and terbium and homogeneously covering the mineral core to an equal or greater thickness at 300 nm, which is characterized in that the particles have a mean diameter of between 3 and 6 microns and in that the lanthanum phosphate, cerium and terbium corresponds to the following general formula (1): Ce Tb PO (1) wherein x and y satisfy the following conditions: 0.4 ≤ x ≤ 0.7 and 0.13 ≤ y ≤ 0.17. The invention also relates to a phosphor which comprises the phosphate as defined above.