Abstract
Praseodymium doped crystals and glasses are of interest with respect to their up-conversion ability. In order to establish the efficiencies of up-conversion we have measured and calculated radiative and non-radiative transition probabilities of the luminescent levels ( 3P 1 + 3P 0), 1D 2 and 1G 4 and measured their lifetimes and concentration dependence of the cross-relaxation rates. Critical radii of the cross-relaxation process are calculated to be 5.6 ± 0.3 A ̊ for the 3P i manifold and 12.8 ± 0.5 A ̊ for 1D 2. These are compared with similar data in fluoride glass.
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