Synthesis, Structure and Photoluminescence Properties of 2D Organic-Inorganic Hybrid Perovskites

Two-dimensional (2D) layered hybrid organic-inorganic perovskites have potential applications in solar cells, electroluminescent devices and radiation detection because of their unique optoelectronic properties. In this paper, four 2D layered hybrid organic-inorganic halide perovskites of (C6H5CH2NH3)(2)PbCl4, (C6H5CH2NH3)(2)PbBr4, (C6H5CH2NH3)(2)PbI4 and (C4H9NH3)(2)PbBr4 were synthesized by solvent evaporation. Their crystal structure and surface morphology were studied. The effects of different halogens and organic amines on perovskites' absorption spectra were investigated, and the photoluminescence (PL) properties were studied by femtosecond ultrafast spectroscopy. The experimental results show that the four perovskites are well crystallized and oriented. With the increase of halogen atom number (Cl, Br, I) in turn, the UV-Vis absorption spectra peaks of perovskites redshift due to the increasing of the layer spacing, but organic amines have little effect on the spectra of perovskites. The PL intensity increases with increasing laser power, but the lifetime decreases with increasing laser power, which is mainly due to the non-geminate recombination. This research is of great significance for realizing the spectral regulation of organic-inorganic hybrid perovskites and promoting their application in nano-photonics and optoelectronic devices.