PHOSPHATE OF LANTHANUM AND AT LEAST ONE RARE EARTH ELEMENT SELECTED FROM CERIUM AND TERBIUM IN THE F

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The phosphate of the invention is a rare earth element (Ln) phosphate, Ln being at least one rare earth element selected from cerium and terbium or lanthanum combined with at least one of the abovementioned rare earth elements, characterised in that the phosphate is in the form of a suspension in a liquid phase of primary isotropic monocrystalline monazite particles having an average size of at least 25 nm and agglomerated into secondary particles having an average size of at most 400 nm. Said phosphate can be used as a phosphor.