Fig. 1: Structural and optical characterizations.

a, b Crystal structure diagrams of C5H11N3(MnCl3·H2O)Br (a) and C5H11N3(MnCl3·H2O)Cl (b), with the free halide ions highlighted in red circles. c Simulated PXRD from single crystal diffraction data and experimental PXRD of powder samples. d, e Calculated density of states. f, g PL, PLE, and absorption spectra. h PL decay curves