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...
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