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Abstract
Single crystals of BaLa 1− x Nd x Ga 3O 7, where 0 ⩽ x ⩽ 0.2, were investigated experimentally using the methods of conventional spectroscopy and crystallography. Structural data and the results of vibrational analysis were employed to interpret the temperature and concentration dependence of excitation decay in the crystals. It has been found that in diluted samples the relaxation process is consistent with multiphonon emission involving high energy Ga-O vibrations. In concentrated samples the excitation decay is governed by phonon-assisted cross relaxation via the 4I 15 2 intermediate level and by a thermally-triggered quenching process, which is supposed to be the energy transfer to structural defects, acting as energy sinks, accelerated by excitation energy migration on Nd 3+ ions.
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