Cerium phosphate and / or terbium phosphate, optionally with lanthanum, phosphor resulting from said phosphate, and process for producing said phosphor

摘要

This invention regards rare earth element phosphorus acid (Ln). Ln is the lanthanum which at least is combined at least with one side of the rare earth element of 1 where it is selected from cerium and terbium kinds or the rare earth element of the above-mentioned 2 kinds. Rare earth element phosphorus acid (Ln), it possesses the crystalline structure of the monazaito mixed type whose rabudohuen type, or the sodium content whose sodium content is maximum 6000ppm is maximum 4000ppm. Phosphorus acid settles the rare earth element chloride at fixed pH under 2, after that calcination does and can by re-making disperse in the warm water. In addition as for this invention, it regards also the phosphor which can by calcination doing phosphorus acid at least with the 1000 .