Synthesis and Luminescent Behavior of Lead, Manganese, and Copper Containing Organic–Inorganic Metal Halides

Organic–inorganic metal halides (OIMHs) have attracted considerable attention owing to their unique optoelectronic properties. Here, we successfully synthesized five lead, manganese and copper containing OIMHs based on 4-aminodiphenylmethane (C13H13N) and 4,4′-methylenedianiline (C13H14N2). Among them, (C13H14N)2PbCl4 and (C13H14N)2PbBr4, both exhibiting two-dimensional frameworks, crystallize into the Pmm2 and P21/c space groups, respectively, and present optical band gaps of approximately 3.6 and 3.0 eV. (C13H14N)2PbCl4 demonstrates blue light emission centered at 502 nm with a substantial full width at half-maximum (fwhm) of 180 nm and a Stokes shift of 182 nm, originating from self-trapped exciton emission. In contrast, (C13H14N)2PbBr4 displays blue photoluminescence characterized by a fwhm of 26 nm and an emission peak at 417 nm, corresponding to free exciton emission. Additionally, we investigated three zero-dimensional OIMHs: (C13H14N)4MnCl6·Cl, (C13H15N2)4CuCl10·4H2O, and [(C13H16N2)(C2H6NH2)MnCl4·2H2O]·Cl. Our research delves into their fundamental optical properties and luminescence mechanisms, providing valuable insights for future studies.