Abstract
Prior to x-irradiation the photoluminescence (PL) of Mn-activated LiBaF 3 shows a Mn 2 + emission band at 710 nm; the corresponding excitation bands are between 210 and 620 nm. After x-irradiation the PL emission spectrum shows a band peaking at about 610 nm which is tentatively assigned to a perturbed Mn 2 + emission; the intensity of all PL emission bands is increased. Structure sensitive investigations on the radiation-induced emission band were done by detecting electron paramagnetic resonance (EPR) induced changes in the integral PL emission at a temperature of 1.5 K. The analysis of the angular dependent PL-EPR spectra, recorded for different orientations of the magnetic field, yielded that the 610 nm luminescence band is due to an excited triplet state ( S = 1 ) of a Mn-related centre with the z -axis of the fine structure tensor close to a 〈 1 1 0 〉 direction.
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