UV absorption edge shift by doping alkali fluorides in fluoroaluminate glass

N. Kitamura, K. Fukumi, J. Nishii, M. Makihara, T. Sasaki, N. Ohno

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The effect on transmittance and reflectance in the vacuum ultraviolet (VUV) region by doping alkali fluorides (LiF, NaF and KF) has been investigated in a ternary fluoroaluminate (18BaF2-37CaF2-45AlF3) glass. The absorption edge of the glass obeys the Urbach rule and was shifted monotonically towards higher energies by increasing the concentration of each alkali fluoride. The VUV reflection peak at 11.3 eV was not sensitive to the change of the concentration of dopants. The magnitude of the edge shift was 10-20 times larger than that expected from the additive law on the magnitude of absorption coefficients of the glass and alkali fluorides. An excitonic interaction similar to that observed in mixed crystals of alkali halides is suggested from the monotonic shift toward the absorption edges of the dopants. The weak sensitivity of the reflection peak upon doping supports that the excitonic state lies predominantly around the edge energies.

Original languageEnglish
Pages (from-to)691-694
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number4
Publication statusPublished - Apr 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


Dive into the research topics of 'UV absorption edge shift by doping alkali fluorides in fluoroaluminate glass'. Together they form a unique fingerprint.

Cite this