Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 3967-3974 |
| Number of pages | 8 |
| Journal | Journal of Physics: Condensed Matter |
| Volume | 18 |
| Issue number | 16 |
| Early online date | 7 Apr 2006 |
| DOIs | |
| Publication status | Published - 26 Apr 2006 |
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Keywords
- high-speed optical techniques
- lithium compounds
- nonradiative transitions
- phonons
- resonant tunnelling
- time resolved spectra
- vanadium
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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 journal › Article
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
PY - 2006/4/26
Y1 - 2006/4/26
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
U2 - 10.1088/0953-8984/18/16/006
DO - 10.1088/0953-8984/18/16/006
M3 - Article
VL - 18
SP - 3967
EP - 3974
JO - Journal of Physics: Condensed Matter
JF - Journal of Physics: Condensed Matter
SN - 0953-8984
IS - 16
ER -