Energy migration and energy transfer in the system Ce(III)/Tb(III) in β″-alumina crystals

The parameters of energy migration and energy transfer between Ce(III) and Tb(III) ions in β″-alumina were found by Monte Carlo simulation of experimental decay curves. The polarization measurements reveal significant energy migration in the Ce(III) systems. The value of the critical radius for Ce(III)Ce(III) energy migration is 20.9 ± 1 Å and for energy transfer from Ce(III) to traps is about 24 Å. The critical radius for Ce(III)Tb(III) energy transfer is 3.1 ± 0.1 Å. The results are consistent with two-dimensional space.