Persistent photoluminescence emission from SrTa2O6:Pr3+ phosphor prepared at different temperatures

L. L. Noto, M. Y.A. Yagoub, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Phosphors with persistent emission are of interest for security and emergency signage, and medical diagnosis. Three SrTa2O6:Pr3+phosphor samples with persistent emission were prepared by solid state reaction at 1200, 1400 and 1500 °C. Structural crystallization was shown to improve with an increase in temperature as identified by X-ray diffraction. The scanning electron microscopy images showed that the particles of the phosphor were agglomerated and co-melting was induced by increasing the synthesis temperature. The ion distribution in the phosphors was determined using the time of flight secondary ion mass spectroscopy. The red emission was obtained from the D23H4 and the 3P03H6 transitions at 608 and 619 nm, respectively. The main absorption occurred at 225 nm (5.5 eV), and the band gap (Eg) calculations confirmed that it corresponds to band-to-band excitation. Another excitation due to charge transfer at 300 nm was also obtained which makes the phosphor suitable to be used in red light emitting diodes. The persistent emission time parameters (260-296 s) were calculated from the phosphorescence decay curves using the second order exponential decay equation. The corresponding electron trapping centers were determined using the thermoluminescence spectroscopy, and the activation energy was determined using the initial rise method.

Original languageEnglish
Pages (from-to)8828-8836
Number of pages9
JournalCeramics International
Issue number7
Publication statusPublished - 1 Aug 2015
Externally publishedYes


  • Band gap
  • Persistent emission
  • SrTaO:Pr
  • Thermoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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