Abstract
The visible luminescence of Pr 3+-doped lithium tetraborate glass has been investigated for different Pr 3+-concentrations and temperatures by using steady-state and time-resolved laser spectroscopy. At low Pr 3+ concentration the luminescence is dominated by emission from the 1D 2 state which is populated by fast multiphonon relaxation from the 3P 0 level. As concentration increases the emission from the 1D 2 state shows a strong concentration quenching which indicates the existence of energy transfer processes. The time evolution of the decays from the 1D 2 level together with the concentration dependence of the energy migration rates suggest that migration of the excitation energy is competitive with cross relaxation in the concentration range studied.
Published Version
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