Abstract
The results of the decay time, quantum efficiency and temperature dependence measurements of the uv, blue and red luminescence of PbCl 2 and PbBr 2 are reported. The blue luminescence is associated with a charge transfer transition of the halide ion. PbCl 2 crystals also show a violet luminescence at temperatures lower than 30 K. We tentatively assume that the violet emission, like the uv emission is due to recombination of 3 P 1 cation excitons. The excitation of the blue and red luminescence of both lead halides in the energy region of the 3 P 1 cation exciton absorption band occurs by transport of excitation energy. We arrive at the conclusion that the excitation energy is transferred nonradiatively from the 3 P 1 state of the exciton to the excited state of the centers responsible for the blue and red emission.
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