Spectral properties and dynamics of luminescent states of Pr3+ and Tm3+ in lead borate glasses modified by PbF2

The variation of luminescence kinetics was observed both for Pr3+- and Tm3+-doped samples; the increase of the PbF2 content has changed the 1D2 lifetime from 13.8 to 16.5 μs and from 34 to 43 μs for the 1G4 level.