Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+

Jon-Paul R Wells, Marek Grinberg, Klaas Wynne, T P J Han

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Abstract

We report on time-resolved studies of non-radiative relaxation of V3+ ions in LiAlO2 by means of a two-beam, pump-probe saturation experiment performed with the 150 fs pulsed output of a Ti-sapphire laser. Exciting into the vibronically broadened 3A23T1 transition at 800 nm, a 3T1 relaxation time of 199 ps has been measured at 4 K. This value decreases to 82 ps at room temperature, representing a reduction in the lifetime of a factor of 2.5 due to internal-conversion processes. The relative probabilities for non-radiative, phonon-assisted barrier hopping and quantum mechanical tunnelling through the potential barrier to the 3A2 ground state have been obtained using Mott's expression, yielding best-fit parameters of W0 = (5.2 ± 1) x 109 Hz and W1 = (7.5 ± 1) x 1010 Hz for a potential barrier of Enr = 530 ± 50 cm-1.
Original languageEnglish
Pages (from-to)3967-3974
Number of pages8
JournalJournal of Physics: Condensed Matter
Volume18
Issue number16
Early online date7 Apr 2006
DOIs
Publication statusPublished - 26 Apr 2006

Keywords

  • high-speed optical techniques
  • lithium compounds
  • nonradiative transitions
  • phonons
  • resonant tunnelling
  • time resolved spectra
  • vanadium

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