LUMINESCENT PARTICLES BASED ON RARE EARTH ELEMENTS AND USE THEREOF AS A DIAGNOSTIC AGENT

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The invention relates to a luminescent particle comprising a nanoparticle of formula A1-xLnxVO4(1-y)(PO4)y (I) in which A is selected from yttrium (Y), gadolinium (Gd), lanthanum (La) and mixtures thereof; and Ln is selected from europium (Eu), dysprosium (Dy), samarium (Sm), neodymium (Nd), erbium (Er), ytterbium (Yb) and mixtures thereof; 0 100 μS.cm-1. The invention also relates to a method for producing such luminescent particles, to a colloidal suspension of said particles, and to the use thereof as a diagnostic agent, as well as to a diagnostic kit comprising such luminescent particles.