Organic-inorganic hybrid perovskites (OIHPs) have been a hot research topic for their advanced structural and functional features, which cover almost all the research fields of intelligent materials including ferroelectric, photovoltaic, fluorescent, dielectric, etc. However, the OIHPs ferroelastic semiconductor with optical-electrical response has been a huge challenge and rarely reported. In this work, a rare and interesting hybrid perovskite ferroelastic semiconductor [BFDA]PbBr 3 was synthesized, which benefits from the structural advantage of a long tail BFDA to be balanced by the suitable inorganic framework (BFDA=benzyl-(2-fluoro-ethyl)-dimethyl-ammonium). The [BFDA]PbBr 3 shows the high temperature ferroelastic phase transition at 365 K and a direct band gap of 3.33 eV. In addition, it can emit the charming orange pink light under 365 nm UV lamp. To combine with the ferroelastic, optical and dielectric properties, [BFDA]PbBr 3 can be identified as a very rare

Hybrid metal halides with nonlinear optical (NLO) and dielectric dual switching properties are a class of materials with great application prospects in the fields of optoelectronics and smart devices. However,...

Multi-functional switching materials have magical scientific performance, and they are important components of smart devices. Among all kinds of compounds, perovskite is easy to introduce and compatible multiple physical properties....

Layered 2D organic−inorganic halide perovskites have attracted comprehensive scientific attention due to their excellent dielectric, ferroelectric, and photophysical properties. However, most of the reported crystal compounds only possess a single performance. Here, we report two new layered 2D organic− inorganic halide perovskites: [BA-PbBr 4 ] (Prv-1) and [MACH-PbI 4 ] (Prv-2) (BA = 1-butylamine, MACH = cyclohexanemethylamine). Both compounds (with crystal structures) show switchable phase transitions at 390 and 350 K, respectively. Shockingly, [MACH-PbI 4 ] reveals a high photoluminescence quantum yield of up to 16.3% with the replacement of the halogen and organic cation (Br → I, BA → MACH). In addition, the experimental data and calculated results suggest that both compounds could be used as band gap semiconductors. In brief, this work might provide new strategies for the exploration of dielectric and ferroelectric functional materials.

Molecular rotors possess the unique structure that facilitates the dynamic motion of building blocks to construct artificial molecular machines, which endows them with potential applications in the fields of information...

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.

Lead-free Halides, especially Mn-based ones, are preferred as hotspots in the exploration of photoluminescent materials. However, there are few reports on sensitive reversible thermochromism and switchable dual emission originating from self-trapped exciton emission in pure Mn-Based materials. Here, we report a new Mn-based hybrid material [TMPA] 2 MnI 4 (TMPA = trimethylphenylammonium), which shows two emission peaks at 545 and 660 nm benefitting from the d−d orbital transition of Mn 2+ and the generation of self-trapped excitons, respectively. Due to the different sensitivity to temperature, the stages of thermal activation and thermal quenching of the two emission types are also inconsistent, showing a certain competition relationship and dominating the emission colors in different temperature ranges, resulting in adjustable green−orange−green thermochromic luminescence from 100 to 403 K (both high and low temperatures correspond to green, and orange is displayed at near room temperature). Therefore, thermochromic luminescence can be easily achieved by controlling the temperature under the guidance of excited states. This work provides new insights into the synthesis and application of thermochromic materials. Therefore, it is certain that regulating temperature while being guided by excited states will achieve thermochromic luminescence. This research offers fresh perspectives on the development and potential of thermochromic materials.

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