Abstract
Luminescence associated with excitation of Pb2+ ions has been investigated in a wide concentration range of Pb1-xCdxI2 mixed crystals. Small PbI2 clusters become dispersed in a CdI2 crystal by increasing the Pb2+ concentration from the range of dilute impurity to that of mixed crystals. Time-resolved measurement reveals that luminescence at the absorption edge of crystals consists of emission bands with short and long decay times. The two bands are found to originate from the states related to 3P1 and 3P0 of Pb2+ ions. Energy split between the two states decreases with increase in the size of PbI2 cluster. The result is explained by the change in an exchange energy of electron and hole with the cluster size.
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