A Novel Hybrid Multifunctional Compound: (CMQ)BiCl₅ Showing Enhancement in Physical Properties by Halogen Substitution

Abstract

Organic‐inorganic hybrid multifunctional materials have received significant attention due to their potential applications in smart devices such as phase‐change memory (PCM), resistive random‐access memory (ReRAM). Yet, devices application requires achieving a balance between fast switching speeds, long‐term stability, and high cycling endurance in materials still facing difficulties. Herein, we report two hybrid phase transition compounds: (CMQ)BiCl5(CMQ=Chloromethyl Quinuclidin‐3‐one) (1) and (FMQ)2SbBr5(FMQ=Fluoromethyl Quinuclidin‐3‐one) (2), both two compounds exhibit high phase transition temperature, dual‐stable behavior in dielectric during reversible phase transition process. Notably, 1 exhibit small dielectric change after multiple dielectric state switching. Furthermore, investigate the influence of halogen substitution (F to Cl) for compound properties, which show an Increasing transition temperature (9 K) and raising structural dimension (0D to 1D). Additionally, using first principles, analyze the electronic structure of 1 and find that it has a 3.4 eV wide bandgap, closing to GaN semiconductor (3.4 eV). This work provides a new insight into developing the next‐generation phase transition compounds and chemical modification enhances material performance.

Novel High-Tc, Broadband-Emission Multifunctional Hybrid Compound: (4,4-DCA)2CdCl4 with Sb Doping Enhances Fluorescence Emission

“…However, 1 exhibits poor fluorescence performance with a quantum yield lower than 1%. Transition dipole moment (TDM) analysis reveals that the electronic transitions from the valence band to the conduction band in 1 are hindered due to the indirect band gap and the additional momentum change involved in the electron transition. − This leads to a reduced transition efficiency and suppresses the intensity of fluorescence emission.…”

Silver/Antimony-Base Multifunctional Double Perovskite with H/F Substitution Enhance Properties

“…Wang et al first reported a 2D iodide double perovskite photoferroelectric material, (4,4-DFPD) 4 AgSbI 8 , with significant spontaneous polarization and photoinduced strain, as well as excellent X-ray sensitivity, addressing the gap in dual-metal photoferroelectrics for X-ray detection . The bandgap of perovskites significantly influences their optoelectronic properties, and precise control of the bandgap is a challenge. − Studies have shown that the number of inorganic layers, interlayer spacing, degree of distortion in adjacent octahedra, and weak interactions between organic cations and the inorganic framework affect the bandgap of the compound. Understanding the effects of H/F substitution on bandgap adjustment in dual-metal perovskites is crucial…”