Efficient green emission in organic-inorganic hybrid (C13H22N)2MnCl4 metal halides with large Mn–Mn spacing distance

Organic-inorganic hybrid metal halides hold considerable potential for diverse applications, including light-emitting diodes, display diodes, liquid crystal displays, and photodetectors, owing to their exceptional optical properties. Herein, we successfully synthesized lead-free zero-dimensional (0D) (C13H22N)2MnCl4 metal halide single crystals with green emission, employing an anti-solvent method. The (C13H22N)2MnCl4 single crystals, featuring four-coordinated Mn2+, exhibit pronounced green emission at 528 nm and demonstrate a photoluminescence quantum yield (PLQY) of approximately 72 %. This emission is attributed to the 4T1(G)-6A1(S) transition and the considerable Mn–Mn spacing distance between adjacent [MnCl4]2- tetrahedra. The photoluminescence spectra during thermal cycling underscore the exceptional optical stability of the (C13H22N)2MnCl4 material. These organic-inorganic hybrid manganese halides emerge as a compelling and novel candidate for future light-emitting diode materials.