Excitonic state in anatase TiO2 single crystal

N. Hosaka, T. Sekiya, S. Kurita

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54 Citations (Scopus)


Temperature dependence of polarized absorption near the band gap was measured for as-grown anatase single crystals and annealed ones which were heat-treated in oxygen atmosphere. The steepness index obtained indicates that an exciton is self-trapped. An absorption band appears at 2.9 eV after heat treatment. A broad luminescence was observed at 2.3 eV. The large Stokes shift is consistent with the fact that the exciton relaxes to a self-trapped state.

Original languageEnglish
Pages (from-to)874-875
Number of pages2
JournalJournal of Luminescence
Publication statusPublished - 1997 Jun


  • Anatase
  • Self-trapped exciton
  • Steepness index
  • TiO


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