Abstract
Study of energy transfer from optically excited Eu 3+ to Pr 3+ has been carried out in calibo glass. Probabilities ( P da ) and efficiencies ( η T ) of energy transfer from Eu 3+ to Pr 3+ have been calculated from the life time and emission intensity of Eu 3+ + Pr 3+. At low acceptor concentrations, P da varies linearly with C a showing migration of energy among donors. At high acceptor concentrations, P da depends linearly on ( C a + C d ) 2, which is consistent with Fong and Diestler theory of dipole-dipole mechanism of energy transfer. At low temperatures the probability and the efficiency decrease due to increase in the emission intensity and life time, which suggests that at room temperature the energy is transferred to lattice by donor lowering life time and intensity. At high temperatures no emission from higher levels of donor is obtained which suggests blurring out of energy levels in glassy matrix.
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