Study on the effect of different crystal forms of benzamide on the luminescence properties of Mn2+ in organic-inorganic hybrid metal halides

Mn 2+ -based organic-inorganic hybrid metal halides were synthesized via evaporation crystallization using benzamide (BZM) and nicotinamide (NCM) as organic ligands. The DSC curve shows that the Mn 2+ -based organic-inorganic hybrid metal halides contain two crystal forms of BZM. Steady-state photoluminescence (PL) spectra reveal that the PL emission of Mn 2+ shifts from red to green as the crystal form of BZM changes. Density functional theory (DFT) calculation suggests that there is a certain rule between the transformation of BZM crystal form and the change of Mn 2+ luminescence characteristics.