Electron beam induced green luminescence and degradation study of CaS:Ce nanocrystalline phosphors for FED applications

Vinay Kumar, Varun Mishra, M. M. Biggs, I. M. Nagpure, O. M. Ntwaeaborwa, J. J. Terblans, H. C. Swart

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Green luminescence and degradation of Ce 3+ doped CaS nanocrystalline phosphors were studied with a 2 keV, 10 μA electron beam in an O 2 environment. The nanophosphors were synthesized by the co-precipitation method. The samples were characterized using X-ray diffraction, Transmission electron microscopy, Scanning electron microscopy/electron dispersive X-ray spectroscopy and Photoluminescence (PL) spectroscopy. Cubic CaS with an average particle size of 42 ± 2 nm was obtained. PL emission was observed at 507 nm and a shoulder at 560 nm with an excitation wavelength of 460 nm. Auger electron spectroscopy and Cathodoluminescence (CL) were used to monitor the changes in the surface composition of the CaS:Ce 3+ nanocrystalline phosphors during electron bombardment in an O 2 environment. The effect of different oxygen pressures ranging from 1 × 10 -8 to 1 × 10 -6 Torr on the CL intensity was also investigated. A CaSO 4 layer was observed on the surface after the electron beam degradation. The CL intensity was found to decrease up to 30% of its original intensity at 1 × 10 -6 Torr oxygen pressure after an electron dose of 50 C/cm 2 . The formation of oxygen defects during electron bombardment may also be responsible for the decrease in CL intensity.

Original languageEnglish
Pages (from-to)1720-1724
Number of pages5
JournalApplied Surface Science
Issue number6
Publication statusPublished - 1 Jan 2010
Externally publishedYes


  • Degradation
  • Nanophosphors
  • Surface reaction

ASJC Scopus subject areas

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


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