Synthesis And Application Of Rare Earth Fluoride Nanocrystals

Comparing to the organic optical materials and semiconductornanocrystals, rare earth fluoride upconversion luminescent materials ownhigh photochemical stability, long fluorescence lifetime, narrower emissionpeak width, and big anti-stokes shift which can separate the emissions andinfrared exciting light, as well as big light penetration, no autofluorescenceinterference etc. Therefore, rare earth fluoride upconversion luminescentnano materials are widely studyed for biomarkers.The thesis includes two parts:In the first part, we produced uniform and monodisperse oil-dispersible,water-soluble EuF3, NaEuF4, NaYbF4nanocrystals via acid/ionic liquid (1-butyl3-methyl imidazole four fluoroborate (BmimBF4) two-phase system.The second part is to synthesize Tm-doped NaYbF4nanocrystals viaoleic acid/BmimPF6ionic liquid two-phase system. Through doping largeratomic radius element of Gd and adjusting the volume of sodium oleate to transfer the nanocrystals from cubic phase to hexagonal phase. Then, surfacesof water-soluble NaYbF4: Gd, Tm nanocrystals were modified byStober-based silica coating. Nanocrystals was used to target MGC803cells invitro, in vivo NIR luminescence imaging, etc.