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

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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

Fingerprint

Time and motion study
Aluminum Oxide
Sapphire
Relaxation time
Ground state
Pumps
Ions
pumps
Lasers
probes
Experiments
internal conversion
Temperature
sapphire
relaxation time
saturation
life (durability)
ground state
output
room temperature

Keywords

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

Cite this

Wells, Jon-Paul R ; Grinberg, Marek ; Wynne, Klaas ; Han, T P J. / Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+. In: Journal of Physics: Condensed Matter. 2006 ; Vol. 18, No. 16. pp. 3967-3974.
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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 3A2 → 3T1 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.",
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Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+. / Wells, Jon-Paul R; Grinberg, Marek; Wynne, Klaas; Han, T P J.

In: Journal of Physics: Condensed Matter, Vol. 18, No. 16, 26.04.2006, p. 3967-3974.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Femtosecond pump-probe measurements of non-radiative relaxation in LiAlO2:V3+

AU - Wells, Jon-Paul R

AU - Grinberg, Marek

AU - Wynne, Klaas

AU - Han, T P J

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N2 - 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 3A2 → 3T1 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.

AB - 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 3A2 → 3T1 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.

KW - high-speed optical techniques

KW - lithium compounds

KW - nonradiative transitions

KW - phonons

KW - resonant tunnelling

KW - time resolved spectra

KW - vanadium

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