High-Symmetry Structural Phase Transition Triggers a Triple Switch Based on Dielectric, Nonlinear Optics, and Photoluminescence

Abstract

Organic−inorganic hybrids have attracted wide attention due to the advantages of a designable structure and adjustable function. Among these, phase-transition hybrids can exhibit a variety of properties such as switchable dielectric and optical properties due to their rich chemical adjustability, stable physical properties, and distinct structural features, thus forming stimuli-responsive multifunctional materials. However, how to achieve multifunctional coupling of hybrid materials is still a big challenge. Herein, we have successfully synthesized a phase-transition structure [FPEA] 2 CdCl 4 (FPEA=3-fluorophenethylamine), which undergoes a first-order phase transition at a high temperature of 380.4 K. The phase transition stems from the ordered−disordered dynamic motions of protonated cations and slight distortion of the inorganic framework. Notably, the compound improves the reversible switching of both dielectric and nonlinear optical (NLO) responses. At the same time, [FPEA] 2 CdCl 4 shows broadband luminescence with a photoluminescence quantum yield of 31.07%. The multiple responses exhibited tremendous vitality and wide scope for exploration in sensors, smart switches, light-emitting diodes, and nonlinear optical devices.

Manganese-Based Halogen Regulation Enhances Photoluminescence Efficiency Engineering

“…During the past few years, organic–inorganic hybrids have attracted significant interest and become the topic of researchers’ concerns. − The thermodynamic and kinetic properties of these hybrids are contingent on their distinct chemical constituents and molecular arrangement. Consequently, the chemical design of organic–inorganic hybrids emerged as a focal point across diverse research fields. − Additionally, organic–inorganic hybrid halides are equally appealing due to their versatility, ease of synthesis, , structural tunability, , and optoelectronic properties. , They have demonstrated excellent performance in various properties including dielectricity, ferroelectricity, piezoelectricity, photoluminescence, thermochromism, and nonlinear optics. − Despite this, optimizing and enhancing the material performance poses challenges. It is also worth noting that the halogen modulation approach may also be used to explore more organic–inorganic hybrid compounds with remarkable aesthetics. − …”

Reversible Phase Transition and Dielectric Response of Hybrid Lead-Free Antimony-Based Crystals

“…Moreover, organic–inorganic hybrid halide counterparts have captured equal attention due to their versatility, solution-processability, and structural tunability. − These compounds have showcased an outstanding performance in various areas such as dielectric, ferroelectric, piezoelectric, photoluminescent, thermochromic, and nonlinear optics. − Importantly, the properties of phase transition materials are closely tied to their molecular structure. Modulating the molecular structure of these materials stands out as one of the most pivotal methods to attain specific properties. − Even minor adjustments in the crystal structure can result in substantial transformations in their properties. By doing so, it becomes possible to achieve superior properties, including higher phase transition temperatures, narrower band gaps, and excellent optical properties.…”

Comprehensively understanding the distinct properties of crystal structure, phase transition and dielectrics in [M(crown)n]ReO4 (M+ = Na+, K+, NH4+; crown = 15-crown-5, 18-crown-6; n = 1 or 2)

“…These transitions often result in significant alterations in crystal structures and various physical properties such as thermal, optical, dielectric, and magnetic characteristics. 1–11 Due to their broad applications in fields such as data storage, signal processing, and switchable dielectric devices, phase transition materials (PTMs) have garnered considerable interest in recent years. 12–18 Consequently, the design and controllable synthesis of novel PTMs remain important focal points in the realms of chemistry and materials science.…”