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Photographs of (a) (PEA)2PbI4 and (b) (PEA)2MAPb2I7 crystals under 375 nm laser excitation. The insets correspond to red emission at the 532 nm excitation wavelength. Schematic crystal structures of (c) (PEA)2PbI4, (d) (PEA)2MAPb2I7, (e) (BA)2PbI4, and (f) (BA)2MAPb2I7 perovskite.
