Near-unity quantum yield in zero-dimensional lead-free manganese-based halides for flexible X-ray imaging with high spatial resolution  

作　　者：Wen Ma Dehai Liang Qingkai Qian Qionghua Mo Shuangyi Zhao Wensi Cai Jiangzhao Chen Zhigang Zang 

机构地区：[1]Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education),Chongqing University,Chongqing,400044,China

出　　处：《eScience》2023年第2期103-111,共9页电化学与能源科学（英文）

基　　金：This work is financially supported by National Natural Science Foundation of China(11974063);Fundamental Research Funds for the Central Universities(2022CDJQY-010);Graduate scientific research and innovation foundation of Chongqing,China(No.CYB22060);Fundamental Research Funds for the Central Universities(2021CDJQY-022).The authors would like to thank Dr.Xiangnan Gong and Miss Chuanyao Yang at Analytical and Testing Center of Chongqing University for their assistance with SCXRD and PL analysis.The authors would also like to thank Kang An(Industrial Computed Tomography(ICT)Research Center of Chongqing University)and Qianqian Lin(School of Physics and Technology of Wuhan University)for their assistance with X-ray images of scintillators。

摘　　要：Low-dimensional luminescent lead-free metal halides have received substantial attention due to their unique optoelectronic properties.Among them,zero-dimensional(0D)manganese(II)-based metal halides with negligible self-absorption have emerged as potential candidates in X-ray scintillators.Herein,we for the first time report a novel lead-free(TBA)_(2)MnBr_(4) single crystal synthesized via a facile solvent evaporation method.In this crystal,[MnBr_(4)]^(2-)units are isolated by large TBA^(+)organic cations,resulting in a unique 0D structure.The prepared manganese-based crystals exhibit a bright-green emission centered at 512 nm with a high photoluminescence quantum yield(PLQY)of 93.76%at room temperature,originating from the ^(4)T_(1)–^(6)A_(1) transition of Mn^(2+).Apart from their outstanding optical performance,the crystals also show excellent stability and can maintain 94.4%of the initial PLQY even after being stored in air for 90 days.Flexible(TBA)_(2)MnBr4 films prepared as X-ray imaging scintillators exhibit a low detection limit of 63.3 nGyair/s,a high light yield of 68000 ph/MeV,and a high spatial resolution of 15.4 lp/mm.Thus,this work not only enriches the family of lead-free metal halides but also expands the application of manganese(II)-based halides in flexible X-ray scintillators.

关 键 词：Manganese(II)-based metal halides Organic-inorganic hybrids Single crystals Flexible X-ray imaging 

分 类 号：O62[理学—有机化学]