Luminescence and electron degradation properties of Bi doped CaO phosphor

A. Yousif, R. E. Kroon, E. Coetsee, O. M. Ntwaeaborwa, H. A.A. Seed Ahmed, H. C. Swart

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Ca 1-x O:Bi x=0.5% phosphor powder was successfully synthesized by the sol-gel combustion method. The structure, morphology and luminescent properties of the phosphor were characterized by X-ray diffraction, scanning electron microscopy, photoluminescence and cathodoluminescence (CL) spectroscopy. The results showed that the Ca 1-x O:Bi x=0.5% consisted of single face-centred cubic crystals and that the phosphor particles were uniformly distributed. When the phosphor was excited by a xenon lamp at 355 nm, or a 325 nm He-Cd laser, or electron beam, it emitted strongly in the blue near-UV range with a wavelength of 395 nm ( 3 P 11 S 0 transition of Bi 3+ ). The CL intensity was monitored as a function of the accelerating voltage and also as a function of the beam current. The powder was also subjected to a prolonged electron beam irradiation to study the electron beam induced CL intensity degradation. X-ray photoelectron spectroscopy was used to analyze the Ca 1-x O:Bi x=0.5% phosphor sample surface before and after degradation.

Original languageEnglish
Pages (from-to)1064-1069
Number of pages6
JournalApplied Surface Science
Publication statusPublished - 30 Nov 2015
Externally publishedYes


  • CaO:Bi
  • Cathodeluminescence
  • Electron degradation
  • Photoluminescence

ASJC Scopus subject areas

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


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