Luminescent dynamics of Pr3+ in MTaO4 hosts (M=Y, la or Gd)

Luyanda L. Noto, Shreyas S. Pitale, Marek A. Gusowki, O. Martin Ntwaeaborwa, Jacobus J. Terblans, Hendrik C. Swart

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33 Citations (Scopus)


Luminescence characteristics including fluorescence, phosphorescence, and thermoluminescence of Pr3+ in orthotantalate host matrices are presented. X-ray diffraction (XRD) spectra indicate that MTaO 4:Pr3+ (M=Gd, Ta and Y) phosphor materials were successfully prepared at 1200 C using the solid state reaction method. Red and blue-green emissions were observed from the three phosphors when they were characterised using the DESY synchrotron radiation. A simplified energy transfer scheme explaining energy transfer from the TaO4 group to either Gd3+ states in the GdTaO4:Pr3+ system or directly to Pr3+ states in LaTaO4:Pr3+ and YTaO4:Pr3+ systems is presented. Afterglow measurements were carried out after UV exposure at room temperature and the phosphorescence decay curves suggest multi-exponential decay behaviour consisting of the slow and fast components following the order; GdTaO4:Pr 3+<LaTaO4:Pr3+<YTaO4:Pr 3+. Thermoluminescence measurements reveal broad glow curve patterns indicating a quasi-continuous trap distribution in the tantalate phosphors.

Original languageEnglish
Pages (from-to)907-913
Number of pages7
JournalJournal of Luminescence
Publication statusPublished - 2014
Externally publishedYes


  • Defect levels
  • MTaO:Pr
  • Solid state reaction
  • Thermoluminescence

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • General Chemistry
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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