Abstract
We analyzed the optical properties of Wannier excitons in closely located quantum wells in organic–inorganic layered perovskite-type compounds. In the spectra of CnH2n+1NH3X (n = 2, 3, or 4; X = Cl or Br), we observed absorption bands attributed to Wannier excitons. In the case of (C2H5NH3)2PbBr4, two bands were observed in the absorption and luminescence spectra. The two bands are attributed to split Wannier exciton levels arising from the interactions of closely located neighboring quantum wells. Such a split was not observed in the chloride-containing perovskite. This result indicates that the halogens in the inorganic layers have a significant effect on the interactions between the neighboring inorganic layers.
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