A Z/E isomeric cation designed organic-inorganic cadmium chloride ferroelectric with broadband white-light emission  

作　　者：Jun-Chao Qi Yan Qin Hang Peng Hui-Peng Lv Yong-Ju Bai Xin Shen Zhang-Tian Xia Wei-Qiang Liao 

机构地区：[1]Ordered Matter Science Research Center,Nanchang University,Nanchang 330031,China

出　　处：《Science China Chemistry》2024年第12期4167-4174,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(22175082,91856114)。

摘　　要：Hybrid organic-inorganic metal halides(HOMHs)have attracted tremendous interest in the past decades due to their diverse functional properties,such as ferroelectricity and luminescence.However,although a large number of ferroelectric HOMHs and luminescent HOMHs have been reported,the HOMH ferroelectrics with white-light emission remain very sparse.Here,for the first time,by using the Z/E isomeric organic cation,we designed a cadmium-based HOMH ferroelectric[EE-PMU]CdCl_(4)(EEPMU=pyridin-2-ylmethanamide muconate)with broadband white-light emission.In contrast to the[ZZ-PMU]CdCl_(4)with centrosymmetric crystal structure at room temperature,[EE-PMU]CdCl_(4)adopts the polar crystal symmetry,which shows piezoelectricity with a piezoelectric coefficient of d33up to 19 pC/N and ferroelectricity with the saturated polarization of 1.52μC/cm^(2).Moreover,[EE-PMU]CdCl_(4)exhibits a broadband white-light emission with an ultra-high color rendering index of 91under UV excitation,which is related to the severely distorted[CdCl_(4)]^(2-)tetrahedron in the structure.To our knowledge,[EEPMU]CdCl_(4)is the first example of Z/E isomeric cation-designed HOMH ferroelectric and the first cadmium halide white-light emissive ferroelectric.This finding paves a new way for the design of organic-inorganic molecular ferroelectrics with white-light emission.

关 键 词：organic-inorganic hybrids molecular ferroelectrics FERROELECTRICITY PHOTOLUMINESCENCE white-light emission 

分 类 号：TB34[一般工业技术—材料科学与工程]