ULTRABRIGHT LUMINESCENT LANTHANIDE NANOPARTICLES COMPRISING TERBIUM, WITH LONGER EXCITED-STATE LIFETIME

摘要

The invention provides luminescent lanthanide nanoparticles having simultaneously an improved brightness and an increased lifetime of the excited-state. These nanoparticles comprise terbium ions and ions of a second lanthanide, preferentially europium, and are coated with molecules of chromophore ligand bonded to the surface of the nanoparticle.;The ligand is an organic molecule comprising at least one chromophore radical of formula I or of formula II:wherein R is selected from H, CN group or COOH group.;The phosphorescence excited-state lifetime is improved by energy transfer from surface terbium ions to core ions of the second lanthanide.;The nanoparticle may further comprise a carrier molecule of analytical interest covalently attached to at least one ligand molecule.