“…The library of 0D metal halides with octahedral building units includes both lead‐based and lead‐free compounds: Ti IV , Hf IV , Zr IV , Pd IV , Pb II , Sn IV , Te IV , Sb III , and Bi III . However, only several of these examples exhibit photoluminescence (PL) at room temperature (RT), and this emission is seldom characterized by a high PL quantum yield (QY).…”