Understanding the effect of hydrogen bonding on the structural transition and emission properties in zero-dimensional hybrid metal halides: (3,5-DMP)3BiX6 (X = Cl, Br, I)

, the emission peak shifted towards higher energy with a very weak blue emission band at ∼440 nm (PLQY = 0.8%). Stronger hydrogen bonding-induced polyhedral distortion in (3,5-DMP)3BiCl6 facilitates the formation of self-trapped excitons (STEs) and enhances the luminescence properties with higher PLQY. Furthermore, a white light-emitting diode (WLED) was fabricated using the Cl-compound, which displayed a CRI value of 85.0 and a CCT value of 5219 K. This study investigates the effect of variation of halide ions and the hydrogen bonding interaction on the structural distortion and PL properties of these Bi-based OIMHs, thereby providing a reference for the correlation between hydrogen bonding-induced structural variation and PL efficacy.