Abstract
This paper describes the synthesis and characterization of self-assembled organic–inorganic layered perovskite compounds, (C 6H 5-C n H 2 n -NH 3) 2PbBr 4 ( n=1–4). the effect of the number of carbon atoms of the alkyl chain length ( n) on optical properties has been studied. (C 6H 5-C n H 2 n -NH 3) 2PbBr 4 films fabricated by spin-coating are microcrystalline form, single phase and oriented with the c-axis. Crystallinity, the maximum PL intensity and the lifetime of exciton emissions varied with the number of carbon atoms. the lowest-energy exciton splits into a few fine-structure levels at low temperatures. Time-resolved photoluminescence spectra reveal that (C 6H 5-C n H 2 n -NH 3) 2PbBr 4 shows both singlet and triplet excitons. with decreasing temperature, triplet exciton emissions become dominant for (C 6H 5-C n H 2 n -NH 3) 2PbBr 4 ( n=1–3), while (C 6H 5-C 4H 8-NH 3) 2PbBr 4 shows mainly singlet exciton emissions. The intersystem crossing from excited singlet state to triplet state plays an important role in the relaxation process of excitons.
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