Abstract
| Original language | English |
|---|---|
| Article number | 025706 |
| Number of pages | 6 |
| Journal | Materials Research Express |
| Volume | 1 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 7 May 2014 |
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Keywords
- calcium compounds
- chromium
- ground states
- high-speed optical techniques
- hopping conduction
- phonons
- tunnelling
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Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr. / Wells, Jon-Paul R.; Han, Thomas P J.
In: Materials Research Express, Vol. 1, No. 2, 025706, 07.05.2014.Research output: Contribution to journal › Article
TY - JOUR
T1 - Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr
AU - Wells, Jon-Paul R.
AU - Han, Thomas P J
PY - 2014/5/7
Y1 - 2014/5/7
N2 - We use a femtosecond pump-probe technique to directly measure fast nonradiative relaxation following excitation of the 3A 23T1 transition in Ca10(PO4)6 F2(CFAP) doped with tetravalent chromium. We measure a 3T1 relaxation time of 137 ps at 10 K which decreases to 37 ps at room temperature through internal conversion directly to the 3A2 ground state. We find rates for quantum mechanical tunnelling and phonon assisted barrier hopping of 0 = 7.9 109 Hz and W1 = 3.4 1011 Hz respectively, with a barrier height of 630 cm-1.
AB - We use a femtosecond pump-probe technique to directly measure fast nonradiative relaxation following excitation of the 3A 23T1 transition in Ca10(PO4)6 F2(CFAP) doped with tetravalent chromium. We measure a 3T1 relaxation time of 137 ps at 10 K which decreases to 37 ps at room temperature through internal conversion directly to the 3A2 ground state. We find rates for quantum mechanical tunnelling and phonon assisted barrier hopping of 0 = 7.9 109 Hz and W1 = 3.4 1011 Hz respectively, with a barrier height of 630 cm-1.
KW - calcium compounds
KW - chromium
KW - ground states
KW - high-speed optical techniques
KW - hopping conduction
KW - phonons
KW - tunnelling
U2 - 10.1088/2053-1591/1/2/025706
DO - 10.1088/2053-1591/1/2/025706
M3 - Article
VL - 1
JO - Materials Research Express
JF - Materials Research Express
SN - 2053-1591
IS - 2
M1 - 025706
ER -