Abstract
Temperature dependence of decay curves of persistent phosphorescence in Eu2+-doped Ba3SiO5 crystals indicates that there are, at least, three electron–hole recombination centers. The decay curve from the dominant center is represented by I(t)=(A/t)(exp(−t/τ1)−exp(−t/τ0)) or I(t)=A/tn (n>1) below or above 360K, respectively. The integrated intensities of the decay curves decrease drastically in increasing temperature above 360K. As such temperature behavior is very similar to that of the intrinsic Eu2+ luminescence with short decay times of less than 2.7μs in Ba3SiO5, the deexcitation occurs through thermally multi-phonon assisted nonradiative relaxation to the ground state of Eu2+ in Ba3SiO5.
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