Fluorescence and upconversion spectral studies of Ho3+ in alkali bismuth gallate glasses

G. A. Kumar, A. Martinez, E. Mejia, J. G. Eden

Research output: Contribution to journalArticlepeer-review


The absorption and emission spectra of Ho3+ in alkali bismuth gallate glass matrices have been investigated in the visible and near-infrared. Strong fluorescence in the green (λ ∼549 nm), arising from the 5S25I8 transition of the ion, has been observed when Ho-doped potassium bismuth gallate glass is optically-excited in the red (∼646 nm). The measured quadratic dependence of the relative 549 nm intensity on pump power demonstrates that the upconversion mechanism is the sequential absorption of two photons. For a pump power of 285 mW at 646 nm, the upconversion efficiency is measured to be 5.5% which is among the highest values reported for glassy or crystalline matrices.

Original languageEnglish (US)
Pages (from-to)117-120
Number of pages4
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - Feb 25 2004


  • Fluorescence
  • Glasses
  • Spectroscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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