title: Revised crystal structure and luminescent properties of gadolinium oxyfluoride Gd₄O₃F₆ doped with Eu³⁺ ions.
abstract: The structure of gadolinium oxyfluoride nanoparticles was revised. Extensive studies including X-ray diffraction and Rietveld refinement as well as Fourier transform infrared spectroscopy and Raman spectroscopy confirmed the monoclinic P12/c1 crystal structure of Gd4O3F6. Morphological analysis using transmission electron microscopy showed the nanocrystallinity of the materials prepared via the sol-gel Pechini's method. The luminescent properties of the prepared materials with different concentrations of Eu(3+) ions were characterized by emission spectroscopy. The phosphors obtained were investigated in the vacuum ultraviolet range using synchrotron radiation. The Judd-Ofelt parameters (Ω2, Ω4) and emission efficiencies η were calculated and are discussed in detail.
authors.affiliation: Department of Rare Earth, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland. tgrzyb@amu.edu.pl.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Grzyb
authors.forename: Rafal J
authors.initials: RJ
authors.lastname: Wiglusz
authors.forename: Vitali
authors.initials: V
authors.lastname: Nagirnyi
authors.forename: Aleksei
authors.initials: A
authors.lastname: Kotlov
authors.forename: Stefan
authors.initials: S
authors.lastname: Lis