Origin of singlet self-trapped exciton and enhancement of photoluminescence quantum yield of organic–inorganic hybrid antimony(III)chlorides with the[SbCl_(5)]^(2)−units  

作　　者：Tao Huang Ke Li Jinyu Lei Quan Niu Hui Peng Bingsuo Zou 

机构地区：[1]State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,School of Resources,Environmental and Materials,Guangxi University,Nanning 530004,China [2]State Key Laboratory of Luminescent Materials and Devices,School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China

出　　处：《Nano Research》2023年第11期12680-12688,共9页纳米研究（英文版）

基　　金：supported by the Guangxi NSF(No.2020GXNSFDA238004);the Bagui Scholar project of Guangxi province;the Scientific and Technological Bases and Talents of Guangxi(No.Guike AD21238027).

摘　　要：Sb-based organic–inorganic hybrid metal halides(OIHMHs)with[SbCl5]2−units have been widely reported due to high photoluminescence quantum yield(PLQY)and occasional multiple self-trapped exciton(STE)emission bands mainly out of singlet and triplet states,and their multi-band emission is important in white light-emitting diode(WLED).However,not all these OIHMH compounds can produce both emissions out of singlet STE and triplet STE at room temperature simultaneously.It is crucial to consider how the singlet STE generates and retains to emit light at room temperature for this material’s design and application.Herein,a strategy is proposed that can significantly lift Sb halide PLQY by synthesizing two Sb-based OIHMHs using organic amine cations of different-sized and-quantity,which modulate the distance of neighboring emission centers.Therein,the occurrence of singlet STE emission is found to be closely related to the distance of[SbCl_(5)]^(2)−units and local unit distortion in the lattice.The larger distance can produce smaller local distortions,favoring the formation of the singlet STE emission band at higher energy.This is the first work to reveal the relationship between the local structure and the origin of the singlet STE emission band,providing new insights into the modulation of the Sb-based OIHMH’s emission.

关 键 词：antimony halide self-trapped exciton M-Xn cluster separation structure distortion 

分 类 号：TB383[一般工业技术—材料科学与工程]