摘要
Exploring the fine-structure of cesium lead bromide(CsPbBr3)perovskite nanocrystals(NCs)is not only vital to fundamental understanding of recombination mechanism of exciton but also crucial for improving the performance of quantum light emitters and spintronic devices Herein,utilizing low-temperature magneto-photoluminescence(PL)measurement,we provide the direct PL spectral feature of the dark exciton in CsPbBr3 single crystal,and demonstrate that the singlet dark exciton is located^20 meV below the triplet bright exciton.Furthermore,no significant polarization effect was measured from magnetic-polarization method,indicating that there is no spin selectivity for dark exciton.
二维钙钛矿材料作为21世纪最热门的材料之一,其优异的光电特性使其在太阳能电池、激光器等方面具有巨大的应用潜力.二维无机钙钛矿结构CsPbX3(X=Cl,Br,I)的激子性质对其光电特性具有决定性的作用.本工作针对CsPbBr3中的暗激子进行了详细的研究,通过施加面外磁场,实现了对CsPbBr3中暗态激子的激活并发现暗态激子的荧光强度随磁场增加而呈现线性增强.本工作揭示了CsPbBr3暗激子的磁场调控行为和内在物理机制,对深入理解其光电特性具有重要的科学意义.
作者
Zhongtai Shi
Shoaib Muhammad
Longjiang Deng
Zhen Liu
Lei Bi
Linbo Zhang
Li Zhang
Peiheng Zhou
Haiyan Chen
Haipeng Lu
Jianliang Xie
Dong Li
Anlian Pan
Bo Peng
石钟太;Shoaib Muhammad;邓龙江;刘镇;毕磊;张林博;张丽;周佩珩;陈海燕;陆海鹏;谢建良;李东;潘安练;彭波(National Engineering Research Center of Electromagnetic Radiation Control Materials,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;Key Laboratory for Micro-Nano Physics and Technology of Hunan Province,State Key Laboratory of Chemo/Biosensing and Chemometriscs,College of Materials Science and Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China;Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education,University of Electronic Science and Technology of China,Chengdu 610054,China)
基金
supported by the National Natural Science Foundation of China(51602040,51872039,51525202 and 51902098)
the Science and Technology Program of Sichuan(M112018JY0025)
Scientific Research Foundation for New Teachers of UESTC(A03013023601007)
the Ministry of Science and Technology of China(MOST,2016YFA0300802)。
