Abstract
The first low-temperature absorption and luminescence spectra of MnO42--doped crystals of Cs2CrO4, SrCrO4, CsBr, and CsI are reported. Single crystals of Cs2CrO4:MnO42-, which crystallize in the orthorhombic β-K2SO4 structure, were grown from basic aqueous solutions. An alkali−chloride flux composition was used to obtain single crystals of SrCrO4:MnO42- with the monoclinic monazite structure. Crystals of CsBr:MnO42- and CsI:MnO42- were prepared by slowly cooling the melt. The site symmetry in SrCrO4 is C1, but the deviations from D2 symmetry are small, and the spectra are analyzed in the approximate D2 symmetry. The 2E ↔ 2T2 ligand-field transitions are strongly c polarized, and in absorption only the transition to the lowest-energy component of the split 2T2 state is observed with its origin at 10 303 cm-1. Luminescence is exclusively observed to the lower-energy component of the 2E state. By a combination of absorption and luminescence data, it is shown that, in the cubic CsBr and CsI lattices, MnO42- i...
Published Version
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