Low voltage electron induced cathodoluminescence degradation and surface characterization of Sr 3 (PO 4 ) 2 :Tb phosphor

I. M. Nagpure, Shreyas S. Pitale, E. Coetsee, O. M. Ntwaeaborwa, J. J. Terblans, H. C. Swart

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Tb 3+ -doped Sr 3 (PO 4 ) 2 phosphor was prepared by a sol-gel combustion method. A trigonal structure having Sr and O atoms occupying two different lattice sites were obtained. Scanning Auger nanoprobe was used to analyze the morphology of the particles. Photoluminescence (PL) and cathodoluminescence (CL) properties of Sr 3 (PO 4 ) 2 :Tb powder phosphors were evaluated and compared. In addition, the CL intensity degradation of Sr 3 (PO 4 ) 2 :Tb was evaluated when the powders were irradiated with a beam of electrons in a vacuum chamber maintained at an O 2 pressure of 1 × 10 -6 Torr or a background pressure of 1 × 10 -8 Torr O 2 . The surface chemical composition of the degraded powders, analyzed by X-ray photoelectron spectroscopy (XPS), suggests that new compounds (metal oxides) of strontium and phosphorous were formed on the surface. It is most likely that these compounds contributed to the CL intensity degradation of the Sr 3 (PO 4 ) 2 :Tb phosphors. The CL properties and possible mechanism by which the new metal oxides were formed on the surface due to a prolonged electron beam irradiation are discussed.

Original languageEnglish
Pages (from-to)10147-10155
Number of pages9
JournalApplied Surface Science
Volume257
Issue number23
DOIs
Publication statusPublished - 15 Sept 2011
Externally publishedYes

Keywords

  • AES
  • Cathodoluminescence
  • ESSCR
  • Electron degradation
  • NanoSAM
  • Photoluminescence
  • XPS

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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