Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr

Jon-Paul R. Wells; Thomas P J Han

doi:10.1088/2053-1591/1/2/025706

Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr

Jon-Paul R. Wells, Thomas P J Han

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	025706
Number of pages	6
Journal	Materials Research Express
Volume	1
Issue number	2
DOIs	https://doi.org/10.1088/2053-1591/1/2/025706
Publication status	Published - 7 May 2014

Keywords

calcium compounds
chromium
ground states
high-speed optical techniques
hopping conduction
phonons
tunnelling

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10.1088/2053-1591/1/2/025706

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title = "Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr",

abstract = "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.",

keywords = "calcium compounds, chromium, ground states, high-speed optical techniques, hopping conduction, phonons, tunnelling",

author = "Wells, {Jon-Paul R.} and Han, {Thomas P J}",

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doi = "10.1088/2053-1591/1/2/025706",

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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 -

Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr

Abstract

Keywords

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