Facile Control of Ferroelectricity Driven by Ingenious Interaction Engineering

Abstract

Construction of ferroelectric and optimization of macroscopic polarization has attracted tremendous attention for next generation light weight and flexible devices, which brings fundamental vitality for molecular ferroelectrics. However, effective molecular tailoring toward cations makes ferroelectric synthesis and modification relatively elaborate. Here, the study proposes a facile method to realize triggering and optimization of ferroelectricity. The experimental and theoretical investigation reveals that orientation and alignment of polar cations, dominated factors in molecular ferroelectrics, can be controlled by easily processed anionic modification. In one respect, ferroelectricity is induced by strengthened intermolecular interaction. Moreover, ≈50% of microscopic polarization enhancement (from 8.07 to 11.68 µC cm−2) and doubling of equivalent polarization direction (from 4 to 8) are realized in resultant ferroelectric FEtQ2ZnBrI3 (FEQZBI, FEtQ = N‐fluoroethyl‐quinuclidine). The work offers a totally novel platform for control of ferroelectricity in organic–inorganic hybrid ferroelectrics and a deep insight of structure–property correlations.

Halogenation triggering rules in hybrid materials for fluorescence and dielectric phase transitions

“…Photoluminescent materials can be applied to light-emitting diodes (LEDs), which have the advantages of being energy-efficient, environmentally friendly, fully solid-state and long-lasting, and are one of the important ways for human beings to solve the energy crisis in the 21st century. 48–52 As shown in Fig. 6a, the three compounds appear white under natural light, and exhibit stable white, orange and deep-orange colors under 365 nm UV light, respectively.…”

Homochiral Chemistry Strategy to Trigger Second-Harmonic Generation and Dual Dielectric Switches

“…Switchable materials are substances that can switch between two different states under external stimuli such as heat, light, external electric field, and magnetic fields; their physical properties change with the change of states. − These materials can be widely used in various fields such as communication transmission, information storage, and photonic carriers. − Dielectric switches are mostly appearing in structural phase transition materials, where the dielectric constant changes abruptly near the phase transition temperature ( T h ) and reversible cycling occurs. − For example, (DMTBA) 3 Bi 2 Br 9 (DMTBA = N , N -dimethyl- tert -butylaminiu) was reported to have a pair of reversible phase transitions at 188 and 425 K and exhibited excellent dielectric switching properties − However, a single dielectric switch also limits the application scenarios for the material.…”

Dielectric/SHG/PL triple-channel properties in chiral spirocyclic organic–inorganic hybrids

“…Solid–solid phase transition materials can undergo reversible phase transition under external stimuli (heat, light, pressure, and electric field), accompanied by changes in physical properties such as electric, magnetic, and photoluminescence (PL), showing great application potential in switches, sensors, information storage, and electronic communication. 1–10 In recent years, the simultaneous realization of switchable physical properties of multiple channels in a single material has become a research focus. 3,11–13 Organic–inorganic hybrid compounds, with both organic cationic and inorganic anion structural frameworks, are highly flexible and adjustable.…”