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The first 2d organic-inorganic hybrid relaxor-ferroelectric single crystal

Science China Chemistry 2023年第2期66卷 466-474页

作者： Wenjuan Wei Hongqiang Gao Ming Fang Yang Yang Yan Guan Yen Wei Yunzhi Tang department of Chemistry Tsinghua UniversityBeijing100084China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China The Analytical Instrumentation Center of Peking University the Center for Physicochemical Analysis and Measurements in ICCASBeijing100871China

inorganic relaxor ferroelectric solid solution single crystals are spurring new generations of high performance electromechanical devices,including transducers,sensors,and actuators,due to their ultrahigh electric field induced strain,large piezoelectric constant,high electromechanical coupling factor and low dielectric ***,relaxor ferroelectric single crystals found in organic-inorganic hybrid perovskites are very limited,but achieving these superior properties in them will be of great significance in the design of modern functional ***,here the first two-dimensional(2d)organic-inorganic hybrid relaxor ferroelectric single crystal,[Br(CH_(2))_(3)NH_(3)]_(2)PbBr_(4)(BPA_(2)-PbBr_(4),BPA=3-bromopropylamine),achieves some of superior ***,BPA_(2)-PbBr_(4)reveals a successive relaxor ferroelectric-ferroelectric-paraelectric phase transitions accompanying by a large degree of relaxationΔT_(relax)=61 K and ultralow energy loss(tanδd harmonic generation(SHG)effect with maximum value accounts for 95%of the standard KdP due to great deformation of structure(3.2302×10^(-4)).In addition,temperature dependent luminescence spectra(80-415 K)exhibit fluorescence and phosphorescence overlapping emission originated from inorganic and organic components with the nanosecond-scale short lifetime and the millisecond-scale long lifetime,respectively,and the color of the emitted light is continuously adjustable,which is the first to achieve luminescence and relaxor ferroelectricity compatibility.

关键词： 2d organic-inorganic hybrid perovskites ferroelectrics relaxor ferroelectrics paraelectrics luminescence

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A narrow bandgap two dimensional hybrid organic-inorganic perovskite with anomalous structural phase transition

A narrow bandgap two dimensional hybrid organic-inorganic pe...

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中国化学会2019年中西部地区无机化学化工学术研讨会

作者： Chao Li Linsui Li Wenjuan Wei Yunzhi Tang Engineering research institute Jiangxi University of Science and Technology

Two dimensional (2d) organic-inorganic hybrid perovskites have attracted significant attention due to their unique layered structure,and potential optical ***,we research a novel 2d organic-inorganic hybrid perovskite[CHNS]PbI (1)(CHNS=2-Thiophenemethylamine) with a reversible phase transition at *** crystal structure analysis indicates that organic CHNScations show an anomalous variation from high-fold to low-fold disorder between low and high temperature,which makes space group change from Cmca to *** addition,solid ultraviolet measurement indicates 1 has a narrow band gap of 1.80 eV and strong fluorescence at *** results indicate that 1 has potential applications in the field of solar cells and optoelectronic devices.

关键词： 2d organic-inorganic hybrid perovskites Order-disorder Fluorescence Band gap

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