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The Pb 2+ (Li) and Pb 2+ (Na) Centres in KCl Crystals
Author(s) -
Tsuboi T.,
Polosan S.,
Topa V.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(200002)217:2<975::aid-pssb975>3.0.co;2-u
Subject(s) - ion , alkali metal , impurity , emission spectrum , chemistry , absorption (acoustics) , analytical chemistry (journal) , spectral line , excitation , materials science , physics , organic chemistry , chromatography , quantum mechanics , astronomy , composite material
Emission, absorption and magnetic circular dichroism spectra have been studied on Li + ‐ and Pb 2+ ‐codoped KCl crystals. Two emission bands (one is the A T ‐like emission and the other the A X ‐like emission) have been observed at 350 and 453 nm at room temperature, respectively. These emissions have been observed by excitation in the absorption bands with peaks at 270 and 281 nm. These emission bands are attributed to the Pb 2+ (Li) centre, where a Pb 2+ ion has a Li + ion at one of the six nearest neighbouring cation sites. Measurements have been also made on Na + ‐ and Pb 2+ ‐codoped KCl crystals. Unlike the Pb 2+ (Li) centre, only the A T ‐like emission band with a peak at 347 nm due to the Pb 2+ (Na) centre has been observed. It is suggested that such a difference is due to a difference in the position of the impurity alkali ion substituted for the K + ion.