Abstract
Optical and electron paramagnetic resonance (EPR) spectra of NaCl : Eu 2+ crystals were measured in the temperature between 10 and 300 K. An abnormal temperature dependence of photoluminescence (PL) associated with the aggregated europium states was observed in the range from 10 to 100 K. The PL efficiency does not monotonically vary with temperature, but varies sharply in the vicinity of 45 and 70 K. Correspondingly, two turning points of EPR intensity temperature dependence were found at about the same temperatures. The abnormal temperature dependence of luminescence may be explained by the change of nonradiative relaxation rates at different spin ordering states in europium chloride aggregates.
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