Two SbX_(5)-based isostructural polar 1D hybrid antimony halides with tunable broadband emission,nonlinear optics,and semiconductor properties  

作　　者：Zhikai Qi Yali Chen Huizhi Gao Fu-Qiang Zhang Shi-Li Li Xian-Ming Zhang 

机构地区：[1]Key Laboratory of Magnetic Molecules&Magnetic Information Materials(Ministry of Education),Institute of Chemistry and Culture,School of Chemistry and Material Science,Shanxi Normal University,Linfen,041004,China [2]Key Laboratory of Interface Science and Engineering in Advanced Material(Ministry of Education),College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan,030024,China

出　　处：《Science China Chemistry》2021年第12期2111-2117,共7页中国科学（化学英文版）

基　　金：supported by the Natural Science Foundation of China(21871167,22075168);the 1331 Project of Shanxi Province;the Science and Technology Innovation Project in Colleges and Universities of Shanxi Province(2019L0451);the Shanxi Normal University Startup。

摘　　要：Metal halide perovskites based on MX6(M is metal and X is halogen)octahedra have developed into significant materials,extensively used in many fields,such as solid-state lighting,semiconductor,and nonlinear optics.However,the MX_(5)square pyramid-based hybrid metal halides beyond zero-dimensional(0D)polyhedrons and clusters are rarely reported.Herein,we reported two new isostructural hybrid antimony halides,namely(2cepyH)SbCl4(1-Cl)and(2cepyH)SbBr4(2-Br)(2cepy=1-(2-chloroethyl)pyrrolidine),characterized by 1D polar polyanionic chains formed by corner-sharing SbX_(5)tetragonal pyramid units.Upon photoexcitation at 340 nm,1-Cl shows broad,yellow phosphorescence emissions stemming from triplet self-trapped excitons,as proved by its long lifetime(6.85μs)and the temperature dependences of broadband emission.To our knowledge,this should be the first observation on the broadband emissive properties in the 1D hybrid metal halide constructed by MX_(5)tetragonal pyramid units.Moreover,second harmonic generation measurements show that the nonlinear optical properties of 2-Br(∼3.2×KDP)are superior to that of 1-Cl(∼1.8×KDP).Experimental and calculated data indicate that the bandgap of 1-Cl is larger than that of 2-Br and that the polar inorganic moieties determine their band structures.Our work opens up a new way for constructing broadband emission materials with novel polar frameworks.

关 键 词：metal halide square pyramid broadband emission second harmonic generation SEMICONDUCTOR 

分 类 号：TQ135.31[化学工程—无机化工] TB34[一般工业技术—材料科学与工程]