Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Journal Article · Tue Apr 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4916375· OSTI ID:22399376

Senanayake, Pubudu S.; Hughes-Currie, Rosa B. ^[1]; Reid, Michael F. ^[2]; Berden, Giel ^[3]; Reeves, Roger J. ^[1]; Meijerink, Andries ^[4]

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1. Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8410 (New Zealand)
2. MacDiarmid Institute for Advanced Materials and Nanotechnology and Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand)
3. Radboud University Nijmegen, Institute for Molecules and Materials, FELIX Facility, Toernooiveld 7, 6525 ED Nijmegen (Netherlands)
4. Debye Institute for NanoMaterials Science, University of Utrecht, P.O. Box 80000, TA 3508 Utrecht (Netherlands)

We model the dynamic behaviour observed for impurity-trapped excitons in SrF{sub 2}:Yb{sup 2+} using transient photoluminescence enhancement induced via a two-frequency, sequential excitation process employing an UV optical parametric amplifier synchronized to an IR free electron laser (FEL). We observe sharp transitions interpreted as a change of state of the localized hole and broad bands interpreted as a change of state of the delocalized electron. Our modeling indicates that the 4f crystal-field interaction is 25% smaller than in CaF{sub 2}. The photoluminescence enhancement transients are analyzed across a range of excitation frequencies using a system of rate equations. The temporal behavior is explained in terms of intra-excitonic relaxation, local lattice heating by the FEL, and liberation of electrons from trap states.

• OSTI ID: 22399376
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CALCIUM FLUORIDES
COMPUTERIZED SIMULATION
CRYSTAL FIELD
CRYSTALS
DOPED MATERIALS
ELECTRONS
EXCITATION
EXCITONS
FREE ELECTRON LASERS
HOLES
PARAMETRIC AMPLIFIERS
PHOTOLUMINESCENCE
RELAXATION
STRONTIUM FLUORIDES
TRANSIENTS
TRAPPING
TRAPS
YTTERBIUM
YTTERBIUM IONS