COLLOIDAL SUSPENSION OF RARE EARTH FLUORIDE-BASED NANOPARTICLES

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Disclosed is a colloidal suspension of rare earth fluoride nanoparticles which have a mass median diameter D50 of less than 300 nm, preferably less than 200 nm, even more preferably less than 100 nm, and which are present at a concentration of more than 20%, the percentage being in relation to the weight of the suspension.