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Luminescence emission spectra, excitation spectra and decay curves of manganese (II) in alka­ line chloride host lattices were measured at room temperature and 77 K. In most samples the decay curves deviate strongly from an exponential function. Concentration and temperature dependence of the results and a comparison with the homogeneous phases of manganese (II) compounds leads to the following conclusion: In LiCl the statistical incorporation of Mn(II) predominates strongly; an interaction dependent on concentration between Mn (II) -ions and cationic lattice defects could be detected. In NaCl, isolated and linked MnCl 6 -octahedra have to be considered also at very low Mn (II) -concentrations. In KCl, pairs and bigger aggregates of linked octahedra occur much more frequently than the isolated MnCl 6  units. In RbCl a uniform new phase of rubidiumchloro-manganate with linked MnCl 6 -octahedra is formed. The situation in CsCl is quite similar to that in RbCl, but there exists an additional metastable phase with MnCl 4 -tetrahedra.

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Spektren und Abklingprozessc der Mn(II)-Lumineszenz in Alkalichloriden; Untersuchung ihrer Konzentrationsabhangigkeit in MnCl 2 /LiCl / Spectra and Decay Processes of the Mn(II)-Luminescence in Alkali Chlorides; Investigation into their Dependence on Concentration in MnCl 2 LiCl