Figure 4. Intensity normalized, Gaussian components of the PL from the PbS:Bi 0.5% film at 78 K (a) and 310 K (c).

The energy scale has been normalized to the energy position of peak 1. (b) Energy separation of peaks 2 and 3 from peak 1 in the 78–350 K range for all doped samples. Normalized absorbance and PLE at 78 K for the undoped film of series A (d) and the heavily doped film of Bi:4% (e). The inset of (e) contains the absorbance in logarithmic scale at energies in the proximity of the 1S_e-1S_h transition.