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Optical Properties of Anionic Gold Centers in CsBr and CsI Crystals
Author(s) -
Shimanuki S.,
Kawai T.
Publication year - 1991
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/pssb.2221680136
Subject(s) - halide , alkali metal , luminescence , excitation , absorption (acoustics) , chemistry , spectral line , absorption spectroscopy , photoluminescence , emission spectrum , analytical chemistry (journal) , atomic physics , materials science , optics , inorganic chemistry , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , astronomy
Optical studies are for the first time performed on Au − centers in Cs‐halides. Absorption spectra above 90 K and emission and excitation spectra down to 13.9 K are investigated for CsBr:Au − and CsI:Au − crystals. In both the crystals four absorption bands exist called D 1 , C, B, and A and two emission bands called B′ and A′ in the order of decreasing energy. In CsBr, a luminescence resembling α emission known in other alkali systems is also observed, but it seems not to be peculiar to Au − centers because of its dependence on the thermal treatment of the specimens. The King‐Van Vleck factors, λ, which are obtained by analyzing the optical data are 2.5 (CsBr) and 2.2 (CsI), which are larger than unity as in the case of all other alkali halides: Au − so far investigated.