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Issue 13, 2008
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EPR, ENDOR and HYSCORE study of X-ray induced centres in K2YF5 thermoluminescent phosphors

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Abstract

X-Ray irradiation at room temperature produces several paramagnetic centres in rare-earth activated K2YF5 crystals, whose thermal annealing behaviour can be linked with the occurrence of thermoluminescence (TL) glow peaks. In this paper, continuous wave (CW) and pulsed paramagnetic resonance techniques are used to study the structure of a very stable radiation-induced centre, which may be involved in the TL peak at ∼390 °C reported for Ce- and Tb-activated crystals. From the spectra the centre’s g tensor and hyperfine (nuclear quadrupole) tensors for several 19F and 39K neighbouring nuclei are extracted, but no self-hyperfine interaction could be detected. Based on the analysis of the interaction tensors, a model is constructed consisting of an oxygen-related radical (e.g.O or O2) on a substitutional F position in the mirror plane of the YF7 polyhedra. Such a centre most probably corresponds to a trapped-hole state.

Graphical abstract: EPR, ENDOR and HYSCORE study of X-ray induced centres in K2YF5 thermoluminescent phosphors

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Publication details

The article was received on 19 Nov 2007, accepted on 17 Jan 2008 and first published on 15 Feb 2008


Article type: Paper
DOI: 10.1039/B717775E
Citation: Phys. Chem. Chem. Phys., 2008,10, 1789-1798

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    EPR, ENDOR and HYSCORE study of X-ray induced centres in K2YF5 thermoluminescent phosphors

    D. Zverev, H. Vrielinck, F. Callens, P. Matthys, S. Van Doorslaer and N. M. Khaidukov, Phys. Chem. Chem. Phys., 2008, 10, 1789
    DOI: 10.1039/B717775E

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