Investigation of luminescent properties of Ca0.3Sr0.7Al2O4:Tb3+,Eu3+ excited using different excitation sources

Samy K.K. Shaat, Hendrik C. Swart, Odireleng M. Ntwaeaborwa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The structure and luminescent properties of Tb3+-Eu3+ co-activated Ca0.3Sr0.7Al2O4 powder phosphor prepared via solution combustion (SC) method were investigated. The phosphor was analyzed using UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron (XPS), time of flight secondary ion mass spectroscopy (ToF-SIMS), photoluminescence spectroscopy, synchrotron radiation spectroscopy and cathodoluminescence spectroscopy. In particular, the unintended reduction of Eu3+ to Eu2+ was illustrated from the ToF-SIMS, XPS and luminescent spectroscopy data. This reduction is known to occur under certain conditions and possible mechanisms for the reduction are discussed. The chemical imaging performed with ToF-SIMS illustrated how individual ions were distributed in the crystal. Tunable luminescence was observed when the phosphor was optically-excited by different excitation sources including a 325 nm He-Cd laser, synchrotron radiation and high energy electrons. This phosphor was evaluated for application in different types of light emitting devices.

Original languageEnglish
Pages (from-to)72-79
Number of pages8
JournalJournal of Electron Spectroscopy and Related Phenomena
Publication statusPublished - 2014
Externally publishedYes


  • Phosphors
  • Photoluminescence
  • Synchrotron radiationa
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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