A method of manufacturing a phosphate phosphate and lanthanoide

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Producing lanthanide phosphates comprises mixing a rare earth metal salt solution with a phosphate solution at a pH of 0-1 in a first precipitation step and then increasing the pH to more than 2 in a second precipitation step. Independent claims are also included for : (1) phosphate produced as above followed by washing, sieving, drying and calcining at 800-1000[deg]C; (2) luminescent material produced from a phosphate as above by heating above 1000[deg]C, especially using an alkali metal or boron flux.