| 摘要 |
<p>New mixed lanthanum cerium terbium phosphates (LaCeTb phosphates) with improved particle size characteristics, which are more particularly characterised by the fact that they have a mean particle size of between 1 and 15 microns, preferably between 2 and 6 microns, this being with a dispersion index lower than 0.5, preferably lower than 0.4. The invention also relates to the resulting phosphors, which have the same particle sizes and, furthermore, an improved brightness. The phosphates are obtained by precipitation, at a pH which is constant and lower than 2, from a solution containing soluble rare-earth salts. The corresponding phosphors are obtained by calcining these phosphates with or without flux, under or without a reducing atmosphere, as appropriate.</p> |
