Abstract
Four luminescence bands are observed in PbCl 2 at low temperatures. The excitation spectra for these bands have been measured in order to clarify their origins. The 3.76 eV (UV) and 2.88 eV (B) bands are efficiently excited with photons in the region of the lowest exciton band. We attribute both bands to radiative decay of an exciton self-trapped at Pb 2+ ion site. The 2.62 eV (BG) band is excited in the region above the band gap, in which the Pb 2 3+ self-trapped electron (STEL) center can be produced. The BG band also appears in afterglow and photostimulated luminescence spectra. From these results, it is supposed that the BG band is related to Pb 2 3+ (STEL) centers and self-trapped hole centers. The 1.88 eV (R) band is excited even in the energy region lower than the lowest exciton band, and is thus connected to an extrinsic lattice imperfection.
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