5D 37F J emission of Tb doped solgel silica

H. A.A. Seed Ahmed, O. M. Ntwaeaborwa, M. A. Gusowski, J. R. Botha, R. E. Kroon

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Amorphous silica samples doped with 0.1 and 1 mol% of terbium (Tb) were synthesized by the solgel method. In addition to the green light associated with 5D 47F J transitions of Tb 3+, the sample containing 0.1 mol% also emitted blue light as a result of 5D 37F J transitions during photoluminescence (PL) measurements. As a result of concentration quenching this blue emission was not observed for the samples doped with the higher concentration (1 mol%). However the blue 5D 37F J emission was observed in the 1 mol% doped samples during cathodoluminescence (CL) measurements. Since a rough calculation indicated that the excitation rate in the CL system where the blue emission is observed may be similar to a laser PL system under conditions where the blue emission is not observed, the difference is attributed to the nature of the excitation sources. It is suggested that during the CL excitation incident electrons can reduce non-luminescent Tb 4 ions in the silica, substituting for Si 4 ions, to the excited (Tb 3+) state and that these are responsible for the blue emission, which does not occur during PL excitation.

Original languageEnglish
Pages (from-to)1653-1655
Number of pages3
JournalPhysica B: Condensed Matter
Issue number10
Publication statusPublished - 15 May 2012
Externally publishedYes


  • Cathodoluminescence
  • Silica
  • Solgel
  • Terbium

ASJC Scopus subject areas

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


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