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Title: Structural and spectroscopic analyses of europium doped yttrium oxyfluoride powders prepared by combustion synthesis

A facile widely spread technique employed to produce low-cost high-yield oxide powders, combustion synthesis, was used to prepare yttrium oxyfluoride crystalline ceramic powders. The structure of the powders was analyzed by X-ray powder diffraction and Rietveld refinement. Samples heat treated at 700 °C had a predominance of vernier orthorhombic Y{sub 6}O{sub 5}F{sub 8} phase, while samples heat treated at 800 °C crystallized in stoichiometric rhombohedral YOF phase. The samples were doped with luminescent europium trivalent ions (Eu{sup 3+}) in different concentrations (1–15 wt.%) and Judd-Ofelt theory was used to probe the distortion from the inversion symmetry of the local crystal field and the degree of covalency between the rare-earth ion and the surrounding ligands. The luminescence lifetime was measured and the luminescence quantum efficiency (LQE) was estimated. We observed that Eu{sup 3+}:Y{sub 6}O{sub 5}F{sub 8} samples presented higher LQE in spite of the larger local crystal field anisotropy found for Eu{sup 3+}:YOF samples.
Authors:
 [1] ; ;  [2] ;  [3]
  1. PG-Ciência dos Materiais, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA (Brazil)
  2. Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ (Brazil)
  3. Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE (Brazil)
Publication Date:
OSTI Identifier:
22218257
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 4; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMBUSTION; CONCENTRATION RATIO; CRYSTAL FIELD; DOPED MATERIALS; EUROPIUM; EUROPIUM IONS; ORTHORHOMBIC LATTICES; OXIDES; OXYFLUORIDES; PHOTOLUMINESCENCE; SYNTHESIS; TRIGONAL LATTICES; X-RAY DIFFRACTION; YTTRIUM