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

作     者：Wenjuan Wei Hongqiang Gao Ming Fang Yang Yang Yan Guan Yen Wei Yunzhi Tang 

作者机构：Department of ChemistryTsinghua UniversityBeijing100084China Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000China Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing100084China The Analytical Instrumentation Center of Peking Universitythe Center for Physicochemical Analysis and Measurements in ICCASBeijing100871China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2023年第66卷第2期

页      面：466-474页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0811[工学-控制科学与工程] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(22001102,21788102) the Jiangxi Provincial Natural Science Foundation(20202BAB213002) the Education Department of Jiangxi Province(GJJ190474) the Fundamental Research Funds for the Central Universities(JXUST,205200100116) the Program for Excellent Young Talents(JXUST,JXUSTQJYX2020018) 

主　　题：2D organic-inorganic hybrid perovskites ferroelectrics relaxor ferroelectrics paraelectrics luminescence 

摘      要：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(tanδ0.001).Meanwhile,it exhibits a superior second 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.