Abstract
Electrolytic colouration at about 600°C and 350V/cm, for KCl crystal containing Pb2+ and for KCl:Pb2+ crystals co-doped with Li+,Na+ and Rb+ has been undertaken. Several absorption bands were observed in both doped and co-doped crystals in the visible-UV region. Excitation into these bands gives rise to the same 0.86eV emission band except for the Li+-co-doped crystal which gives rise to a 0.80eV emission band. These absorption bands are due to the same Ta-centre related to Pb−. The observed infrared emission intensity of the crystal with F-centres is higher than of without F-centres.
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