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

Nikifor Rakov, R. B. Guimarães, W. Lozano B., Glauco S. Maciel

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Abstract

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 Y6O5F 8 phase, while samples heat treated at 800°C crystallized in stoichiometric rhombohedral YOF phase. The samples were doped with luminescent europium trivalent ions (Eu3+) 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 Eu3+:Y6O5F8 samples presented higher LQE in spite of the larger local crystal field anisotropy found for Eu3+:YOF samples.

Original languageEnglish
Article number043517
JournalJournal of Applied Physics
Volume114
Issue number4
DOIs
StatePublished - 28 Jul 2013

Bibliographical note

Funding Information:
This work was partially supported by the Brazilian agencies CNPq and FAPESB. N.R. also thanks the National Research Network Instituto Nacional de Ciência e Tecnologia de Fotônica.

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