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

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.
LanguageEnglish
Article number025706
Number of pages6
JournalMaterials Research Express
Volume1
Issue number2
DOIs
Publication statusPublished - 7 May 2014

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Chromium
Relaxation time
Ground state
Pumps
Temperature

Keywords

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

Cite this

Wells, Jon-Paul R. ; Han, Thomas P J. / Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr. In: Materials Research Express. 2014 ; Vol. 1, No. 2.
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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.",
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Wells, J-PR & Han, TPJ 2014, 'Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr' Materials Research Express, vol. 1, no. 2, 025706. https://doi.org/10.1088/2053-1591/1/2/025706

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

T2 - Materials Research Express

JF - Materials Research Express

SN - 2053-1591

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Wells J-PR, Han TPJ. Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr. Materials Research Express. 2014 May 7;1(2). 025706. https://doi.org/10.1088/2053-1591/1/2/025706

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