Halogen regulation of multifunctional hybrid materials with photoluminescence and dielectric response

Abstract

Organic-inorganic hybrid switching materials are extensively employed as stimuli responsive materials in sensors, intelligent switches, optoelectronic devices, etc. However, the design of organic-inorganic hybrid materials (OIHMs) that integrate dielectric switching response and superior photoluminescence (PL) continues to encounter challenges. Here, we synthesized three zero-dimensional (0D) organic-inorganic hybrid PL compounds by halogen regulation strategy, (2,5-FBTA)2MnX4 (2,5-FBTA = 2,5-Difluorobenzyltrimethylammonium, X = Br, Cl, I), which are FBTAM-Br, FBTAM-Cl, and FBTAM-I. With the halogen atom transitioning from I to Br, the phase transition temperature (T_p) gradually increases due to the enhanced intermolecular interaction force, with the T_p of FBTAM-I, FBTAM-Cl, and FBTAM-Br being 419, 425, and 438 K, respectively. In addition, the three compounds show excellent PL properties, and as the halogen atom transitions from I to Br, PL quantum yield (PLQY) of FBTAM-I, FBTAM-Cl, and FBTAM-Br being 54.59%, 63.81% and 78.98%, respectively. Through halogen regulation strategy, multifunctional OIHMs with dielectric switching and PL properties have beensuccessfully synthesized. This not only enhances the comprehension of the correlation between structure and properties but also introduces novel and innovative perspectives for the development of multifunctional OIHMs.