The ionic liquid crystal [C12-mim]Cl has been doped with 5 mol% europium nitrate and the photophysical properties of both the ionic liquid and the trivalent europium ion have been monitored with respect to temperature in the range of −48 to +120 °C. The relative transition probabilities to the various ligand-field sub-levels are sensitive to the phase transitions, but the other photophysical parameters, lifetimes and overall intensities of the transitions to Eu(7F2) and Eu(7F4), display monotonous variation with temperature.
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Kocher et al. (2006) studied this question.
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