Surface chemical changes of CaTiO 3:Pr 3+ upon electron beam irradiation

L. L. Noto, S. S. Pitale, J. J. Terblans, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Surface chemical changes of CaTiO 3:Pr 3+ phosphor material and their effect on the red emission intensity of the 1D 23+H 4 transition of Pr 3+, upon electron beam irradiation are presented. Red emission at 613 nm was obtained upon probing the surface with a 2 keV electron beam. The surface chemical changes and Pr 3+ red emission were monitored using an Auger Electron Spectroscopy (AES) and Cathodoluminescence (CL) spectrometer, respectively. The CL intensity decreased with a decrease in O on the surface at 1×10 -8 Torr base pressure and decreased with an increase in O on the surface at 1×10 -6 Torr O 2. The X-ray Photoelectron Spectroscopy (XPS) revealed that CL degradation at 1×10 -6 Torr O 2 is due to the formation of CaO and CaO x as well as TiO 2/Ti 2O 3 non-luminescent species on the surface.

Original languageEnglish
Pages (from-to)1517-1520
Number of pages4
JournalPhysica B: Condensed Matter
Volume407
Issue number10
DOIs
Publication statusPublished - 15 May 2012
Externally publishedYes

Keywords

  • Cathodoluminescence
  • Electron stimulated surface chemical reaction (ESSCR)
  • Intervalence charge transfer (IVCT)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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