The greenish-blue emission and thermoluminescent properties of CaTa 2O6:Pr3+

L. L. Noto, M. L. Chithambo, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Pr3+ exhibits prominent red emission in most oxide phosphors, which comes from the 1D23H4 transition, and greenish-blue emission from 3P03H4,5 transitions is normally less intense. However, a greenish-blue emission was observed from CaTa2O6:Pr 3+ oxide phosphor prepared by solid state reaction at 1200 C. A combination of emission coming from 1D2 and 3P0 levels was observed, with the blue emission from the latter much more prominent. Upon investigating the thermoluminescence properties of the phosphor, the glow curves showed the presence of three different types of electron trapping centres. Interesting properties of the trapping centres, such as the competition between the trapping centres, pre-radiation effects and the calculation of the activation energy were studied. The phosphorescence decay curves showed long lasting afterglow.

Original languageEnglish
Pages (from-to)88-93
Number of pages6
JournalJournal of Alloys and Compounds
Volume589
DOIs
Publication statusPublished - 15 Mar 2014
Externally publishedYes

Keywords

  • Blue emission of Pr ions
  • CaTaO:Pr
  • Electron traps
  • Energy distribution
  • Phosphorescence
  • Thermoluminescence

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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