title: Luminescence behavior of Eu3+ doped LaF3 nanoparticles.
abstract: Europium-doped LaF3 nanoparticles have been prepared by the ionic reaction in the ethanol at 60 degrees C. From the XRD pattern of nanoparticles and the emission spectra of Eu3+ ions, it has been concluded that the Eu3+ ions could easily substitute the La3+ sites and the solid solution La(1-x)Eu(x)F3 can be synthesized. Due to very low phonon energies of LaF3 matrix, the 5D1 emission of Eu3+ ions in La(1-x)Eu(x)F3 nanoparticles can be observed at room temperature when doping concentration of Eu3+ ions is lower than 30 mol%. The quenching process of 5D1 emission can be attributed to cross-relaxation. Since clusters of Eu3+ ions and resonance energy transfer only occurs within one particle due to the hindrance by the particle boundary, the concentration quenching resulted from resonance energy transfer between neighboring Eu3+ ions occurs at higher Eu3+ concentrations in the Eu3+ doped LaF3 nanoparticles.
authors.affiliation: Department of Materials Science and Engineering, Zheda Road 38, Zhejiang University, Hangzhou 310027, PR China.
authors.forename: Daibo
authors.initials: D
authors.lastname: Pi
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Xianping
authors.initials: X
authors.lastname: Fan
authors.forename: Minquan
authors.initials: M
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D005063:Europium / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D008163:Luminescent Measurements; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D013050:Spectrometry, Fluorescence; D014961:X-Ray Diffraction
chemical_list: C083668:lanthanum trifluoride; D005063:Europium; D007811:Lanthanum; D005459:Fluorides