Abstract
This paper describes the synthesis and characterization of organic–inorganic layered perovskite compounds, (C n H 2 n+1 NH 3) 2PbI 4 ( n=4, 5, 7, 8 and 9). The effect of the number of carbon atoms on luminescence properties has been examined. Thin films of microcrystalline (C n H 2 n+1 NH 3) 2PbI 4 fabricated by spin-coating are highly oriented, with the c-axis perpendicular to the substrate surface. Temperature-dependent optical absorption spectra reveal that (C n H 2 n+1 NH 3) 2PbI 4 films ( n=4, 7, 8 and 9) show the structural phase transitions. The excitonic structures of (C n H 2 n+1 NH 3) 2PbI 4 vary with the number of carbon atoms of the alkyl chain length. At low temperatures below 100 K, the lowest-energy free-exciton band of (C n H 2 n+1 NH 3) 2PbI 4 ( n=7, 8 and 9) split into three fine-structure levels. In contrast to (C n H 2 n+1 NH 3) 2PbBr 4 films, (C n H 2 n+1 NH 3) 2PbI 4 ( n=7, 8 and 9) shows no triplet exciton emission, but it shows the Stokes-shifted emission from bound excitons.
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