Preparation of Organic-Inorganic Hybridized Materials Using π-Conjugated Oligomers

Lead halide-based layered perovskites, (H(3)N-Cr,H(2n)-NH(3))PbX(4)(X: I, Br), have attracted much attention because of their exceptional properties and quantum well structure. The tunable optical properties and high crystallinilty of pi-conjugated oligomers make them promising candidates as advanced materials for the optelectronic applications. In this study, pi-conjugated oligomer derivatives, 4,4'-bis-[5-(2-aminoethyl)thienyl]biphenylene hydrohalides (AETP center dot HX; X =Br and I) and 2,7-bis-[5-(2-aminoethyl}thienyl]-9H-fluorene dihydrohalides (AETF center dot HX; H = I), were incorporated into the organic layer of the layered perovskites, as shown by the XRD profile pf hybrid films. The UV-vis absorption spectra of the oligomers were not dependent on the halogen. The specta of the (AETP)PbI(4) and (AETF) PbI(4) films showed a sharp and intense absorption at 516 nm and 514 nm, respectively, while the (AETP)PbBr(4) film exhibited an absorption peak at 400 nm. In the photoluminescence spectrum of the (AETP)PbI(4) film, an exciton emission at 516 nm was observed. On the contrary, (AETP)PbBr(4) and (AETF)PbI(4) films showed characteristic peaks at other wavelengths. These results suggest that a novel energey interaction between organic and inorganic layers was formed in the layered perovskite films.