151Eu Mössbauer study of luminescent Y2O3:Eu3 + core-shell nanoparticles

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Abstract

151Eu Mössbauer spectroscopy was applied to distinguish among different Eu microenvironments and phases in spherical Y2O3:Eu3 + and core-shell Y2O3@Eu3 + phosphor nanoparticles prepared by using homogeneous precipitation method. 151Eu isomer shift revealed that Eu atoms exist only in oxidation state Eu3 + in all spherical and core-shell phosphors. Significant differences have been found between the Mössbauer parameters (isomer shift, principal component of EFG and linewidth) characteristic of spherical Y2O3:Eu3 + and core-shell Y2O3@Eu3 + phosphor nanoparticles. The Mössbauer parameters of spherical Y2O3:Eu3 + were associated with Eu substituting Y in the Y2O3, while Mössbauer parameters of core-shell Y2O3@Eu3 + phosphor were attributed to Eu being in the Eu2O3 shell, proving the structural model and the successful preparation of these phosphors.

Original languageEnglish
Pages (from-to)23-28
Number of pages6
JournalHyperfine Interactions
Volume218
Issue number1-3
DOIs
Publication statusPublished - Jan 1 2013

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Keywords

  • Core-shell nanoparticles
  • Eu Mössbauer spectroscopy
  • Eu doped yttrium oxides
  • Phosphors
  • Spherical nanoparticles

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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