Dispersions of luminescent rare-earth oxide particles, varnish comprising these particles, their m

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A composition including : a dispersion of particles of at least one oxide of at least one luminescent rare earth, disaggregated and stabilized in a hydrophobic liquid medium to which at least one surfactant is added, in which said surfactant is a non-ionic surfactant having an HLB (hydrophilic-to-lipophilic balance) lower than 12.