Abstract
Surface chemical changes of CaTiO 3:Pr 3+ phosphor material and their effect on the red emission intensity of the 1D 2→ 3+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 language | English |
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Pages (from-to) | 1517-1520 |
Number of pages | 4 |
Journal | Physica B: Condensed Matter |
Volume | 407 |
Issue number | 10 |
DOIs | |
Publication status | Published - 15 May 2012 |
Externally published | Yes |
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