Fine-Tuning Optoelectronic Features in Organic-Inorganic Hybrid Metal Halides: A Focus on the Phenylbutanammonium Series.

Extensive research has been dedicated to exploring the potential applications of organic-inorganic hybrid metal halides in optoelectronics. This study presents findings on three metal halides based on phenylbutanammonium (PBA). Specifically, (PBA) 2 MnBr 4 (H 2 O) 2 and (PBA) 2 Sn(IV)Cl 6 exhibit zero-dimensional structures with P 2 1 / c and Pnma space groups, respectively, while (PBA) 2 Sn(II)Br 4 features a two-dimensional structure with P 1̅ space group. Under UV excitation, (PBA) 2 MnBr 4 (H 2 O) 2 exhibits double emission arising from the 4 T 1 → 6 A 1 transitions of Mn 2+ in two distinct coordination environments. The emission spectrum of (PBA) 2 SnCl 6 aligns with that of PBACl, suggesting that the luminescence originates from the organic component. The yellow emission of (PBA) 2 SnBr 4 is attributed to the self-trapped excitons. This study introduces the PBA series of compounds, revealing that varying metal ions and halogen combinations can adjust the structural dimensions and influence optical properties. The insights gained from this work serve as a guide for the preparation of efficient white light-emitting diodes.