Luminescence and lifetime characteristics of microphases in KCl:KI:Pb mixed crystals |
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Authors: | K. Pol k,K. Nitsch |
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Affiliation: | Optical Crystals Department, Institute of Physics, AS CR, Cukrovarnická 10, 16253, Prague 6, Czech Republic |
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Abstract: | Absorption and luminiscence measurements were performed on lead-doped KCl:KI mixed single crystals. Strong differences were found between as-grown and quenched samples. New bands were observed in the absorption spectra of unquenched samples in the spectral region between the limit positions of the A bands, corresponding to chloride or iodide lattices. The strong band at 449 nm dominates the luminescence of these samples at low temperatures. Its kinetics have a complicated form and the decay time is in the interval from ns to ms. Quenched samples have a well-known luminescence spectrum caused by octahedral lead impurity centres in KCl single crystals. The kinetics, however, also indicate mixed chlorine and iodine coordination of lead in the investigated crystals. |
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Keywords: | Mixed halide crystal Lead impurity Microphases |
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