| The silica-encapsulated luminescent lanthanide nanoparticles have been developed for the selective tagging of a wide range of important targets in recent years. However, they are mainly limited to europium and terbium compounds. At the same time, fluorescent analysis has been extensively applied in many research fields. The fluorescence intensity as sensing signal is affected by experimental conditions, sch as detector voltage, sensor location, which decreases the analysis accuracy at certain extent. So, some ratiometric sensors have been development by co-immobilizing a dye that is sensitive to analyte, with a reference dye in a matric.In this work, a type of europium-containing dual-luminophore silica nanoparticles, BHHCT-Eu3+surface-bound silica-encapsulated fluorescein isothiocyanate (FITC) nanoparticles[BHHCT:4,4'-bis(1 ",1 ",1 ",2",2",3",3"-heptafluoro-4",6"-hexanedion-6"-y l)chlorosulfo-o-terphenyl], were successfully prepared using a water-in-oil (W/O) reverse microemulsion method. The results of transmission electron microscopy and luminescence spectroscopy characterizations indicate that the type of nanoparticles are all monodisperse, spherical and uniform in size (～50 nm in diameter), and have stable dual luminescence emission properties. The FITC-BHHCT-Eu3+nanoparticles can be excited at 335 nm to give dual-emission peaks at 525 nm and 610 nm. The luminescence response investigations of the nanoparticles to different metal ions indicate that the new nanoparticle can be used as ratiometric luminescent sensing probes for the selective detections of Fe2+ions, respectively. The performance of the nanoparticle-probe for the metal ion detection was investigated.
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