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Abstract
A low-temperature study of the thermoluminescent dosimeter material, lithium tetraborate(Li2B4O7) doped by Cu, has been carried out by the methods of electron paramagnetic resonance(EPR) and time-resolved polarization spectroscopy using 4–20 eV synchrotron radiation and1 µs Xe flash lamp pulses in the region 3–6 eV. The observed EPR spectra of an unpaired holewith strong d-character and characteristic hyperfine splittings can be ascribed toCu2+ substituted at a Li lattice site and displaced due to relaxation. The results on theCu+-related luminescence strongly support the conclusion about a low-symmetry position of copperimpurity ions in the lithium tetraborate lattice. The temperature dependence of the decay kinetics ofthe Cu+-related 3.35 eV emission indicates a triplet nature for the relaxed excited state of theCu+ centres. An off-centreposition of the Cu+ ion in the relaxed excited state is suggested.
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