Luminescence properties of lanthanide and transition metal ion-doped Ba2LaNbO6 : Detection of MnO68- and CrO69- clusters

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Peter A. Tanner
  • Zaifa Pan

Detail(s)

Original languageEnglish
Pages (from-to)11142-11146
Journal / PublicationInorganic Chemistry
Volume48
Issue number23
Publication statusPublished - 2009

Abstract

The as-prepareddouble-perovskite Ba2LaNbO6 (space group l2/mat ambient temperatures) exhibited an unexpected well-resolved red luminescence, which was found to arise from parts-per-million impurity of Mn4+. The ions Mn4+ or Cr3+ doped into this host are situated at Nb5+ sites with slightly distorted octahedral symmetry, with the distortion greater for the case of greater charge mismatch. The Stokes luminescence spectra of the dopant ions comprise v3, v4, and V6 moiety mode vibronic origins, and the high vibrational frequency ratio v4/v3 signals the stiffness of the O-M-O (M = Mn, Cr) angle in the double perovskite. The site symmetry at the La3+ site of lanthanide ions doped into Ba2LaNbO 6 comprises a 2-fold axis at most. All dopant ions exhibit concentration quenching in this lattice. © 2009 American Chemical Society.