Visible luminescence in KPb2Cl5:Pr3+ crystal

Steady-state and time-resolved laser spectroscopy of Pr3+-doped KPb2Cl5 crystal has been investigated for the first time. Visible luminescence from 3P1 and 3P0 states under excitation in the 3P2,1,0 states has been analyzed. The fluorescence decays of states 3P1 and 3P0 have been measured at 10, 77, and 295 K. Emission from level 1D2 is only observed when this level is directly excited. Anti-Stokes emission from levels 3P1 and 3P0 following excitation of the 1D2 state has been observed between 10 and 295 K. The temporal behavior of the upconverted emission indicates that an energy transfer upconversion is the dominant mechanism for the upconversion process in this crystal.