Synthesis And Luminescence Properties Of Alkaline Earth-rare Earth Fluoride Nanocrystals

Rare earth doped luminescent material is widely used in our daily life due to theirunique luminescent and magnetic properties. It is regarded as a huge potential newmaterial. With the rapid development, lots of researches of rare earth-dopedupconversion nanoparticles (UCNPs) are reported. UCNPs has potential application inbiolabeling probes, drug carriers, lasers, display and biological imaging. On accountof the advantage of large stokes shift, sharp and narrow emission peaks, lowbackground fluorescence and deep tissue penetration. In particular, rare earthfluorides and alkaline earth fluoride have the advantages of high chemical stabilityand intrinsic low phonon energy, attract considerable attention due to being suitablehost materials for rare earth fluorescent ions. It is well known that the properties ofnanocrystals depend highly on their phase, size and shape. At present, the research ofnucleation, growth and controllable synthesis of alkaline-rare earth nanocrystals isimperfect. This paper mainly study that under different ratios of alkaline and rareearth ions, the changes of the phase, size and shape for alkaline-rare earth fluoridesnanocrystals. Furthermore, the upconversion of some pure nanocrystals weremeasured. The main conclusion listed as follows:1. A series of1-xSrF2－xNdF3nanocrystals are synthesized by solvothermal methods.Under the condition of fixed reaction time and temperature with containing NaOH,the crystal phase, morphologies and microstructure of the products at different ratio ofSr2+and Nd3+were studied，respectively. The upconversion emission of pure phasenanocrystals were measured.2. A series of1-xSrF2－xYbF3nanocrystals are synthesized by solvothermal methods.Under the condition of fixed reaction time and temperature with containing NaOH，The crystal phase, morphologies and microstructure of the products at different ratioof Sr2+and Yb3+were studied，respectively. The upconversion emission of pure phasenanocrystals were measured. 3. the ultrafine and monodisperse Ba2LuF7:Yb,Er nanocrystals were prepared via thesolvothermal methods. Upconversion emission spectra of the as-preparedBa2LuF7:Yb,Er with different Er doped concentration were measured. In order toadjust and control the mult-colour upconversion emission, the Mn2+is doped into theBa2LuF7:Yb,Er nanocrystals.