FLUORESCENT ION INTERACTION.
Final rept. 1 May 63-30 Apr 66,
SPERRY RAND RESEARCH CENTER SUDBURY MA
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The interactions between active ions which affect the characteristics of fluorescent systems were studied in two groups of experiments. In the first group of experiments, these interactions were studied by means of energy transfer, fluorescence sensitization and fluorescence quenching experiments. Although radiative transfer is also present, it has been established that the dominant mechanism controlling these phenomena is the resonant coupling between the ions. The radial dependence of the interaction shows that this coupling is principally a dipole-dipole interaction. The sensitization of rare earth ion fluorescence in Y3Al5O12Ce was studied. The transfer of energy into the NdIII and the DuIII ion fluorescences was demonstrated. The Y3Al5O12Ce material shows promise for lowering the threshold for stimulation of the rare earth ion fluorescence. In the second group of experiments, the cooperative interaction of an active ion with the surrounding ions in a magnetically-ordered material was investigated. In particular, the manganese ion fluorescence, in several fluoride salts of manganese, showed anomalous temperature dependent effects which could not be directly attributed to the measured properties of the host. The relation of these effects to the magnetic properties of the material has been explained.