Abstract
Under selective pulsed dye laser excitation in the 1D2 state fluorescence of Pr3+ ions in KYP4O12 has been studied. The presence of complex structures in the excitation and emission spectra associated with ion pairs and perturbed single ions is revealed. It is shown that in low concentration crystals most of the 1D2 fluorescence originates from the perturbed Pr3+ ions. The kinetics of the 1D2 decay is measured and discussed in terms of cross relaxation, energy transfer to traps and up-conversion processes. These results are in satisfactory agreement with the developed rate equation model. The contribution of short-range interaction, probably superexchange, in the quenching of 1D2 fluorescence in strongly concentrated crystals is examined. The first observations of 1D2 and up-converted 3P0 emissions in stoichiometric Pr3+ phosphate are reported.
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