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Magnetic-brightening and control of dark exciton in CsPbBr3 perovskite

二维钙钛矿材料CsPbBr3中暗激子的磁场调控特性研究

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Abstract

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.

摘要

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.

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Acknowledgements

This work was 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), and the Ministry of Science and Technology of China (MOST, 2016YFA0300802).

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Authors and Affiliations

  1. 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

    Zhongtai Shi  (石钟太), Longjiang Deng  (邓龙江), Zhen Liu  (刘镇), Lei Bi  (毕磊), Linbo Zhang  (张林博), Li Zhang  (张丽), Peiheng Zhou  (周佩珩), Haiyan Chen  (陈海燕), Haipeng Lu  (陆海鹏), Jianliang Xie  (谢建良) & Bo Peng  (彭波)

  2. 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

    Shoaib Muhammad, Dong Li  (李东) & Anlian Pan  (潘安练)

  3. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Zhongtai Shi  (石钟太), Longjiang Deng  (邓龙江), Zhen Liu  (刘镇), Lei Bi  (毕磊), Linbo Zhang  (张林博), Li Zhang  (张丽), Peiheng Zhou  (周佩珩), Haiyan Chen  (陈海燕), Haipeng Lu  (陆海鹏), Jianliang Xie  (谢建良) & Bo Peng  (彭波)

  4. Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Zhongtai Shi  (石钟太), Longjiang Deng  (邓龙江), Zhen Liu  (刘镇), Lei Bi  (毕磊), Linbo Zhang  (张林博), Li Zhang  (张丽), Peiheng Zhou  (周佩珩), Haiyan Chen  (陈海燕), Haipeng Lu  (陆海鹏), Jianliang Xie  (谢建良) & Bo Peng  (彭波)

Authors
  1. Zhongtai Shi  (石钟太)
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  2. Shoaib Muhammad
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  3. Longjiang Deng  (邓龙江)
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  4. Zhen Liu  (刘镇)
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  5. Lei Bi  (毕磊)
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  6. Linbo Zhang  (张林博)
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  7. Li Zhang  (张丽)
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  8. Peiheng Zhou  (周佩珩)
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  9. Haiyan Chen  (陈海燕)
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  10. Haipeng Lu  (陆海鹏)
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  11. Jianliang Xie  (谢建良)
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  12. Dong Li  (李东)
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  13. Anlian Pan  (潘安练)
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  14. Bo Peng  (彭波)
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Contributions

Peng B developed the concept and designed the experiment. Peng B and Liu Z prepared the manuscript. Muhammad S, Li D and Pan A synthesized the CsPbBr3 crystal. Shi Z performed the polarization resolved PL measurements. Deng L, Bi L, Zhang LB, Zhang L, Zhou P, Chen H, Lu H and Xie J contributed to the mechanism of magnetic brightening of dark exciton.

Corresponding authors

Correspondence to Anlian Pan  (潘安练) or Bo Peng  (彭波).

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Conflict of interest

The authors declare no competing financial interests.

Bo Peng, Professor, received his BSc (Honors) from Lanzhou University in 2005, and obtained his doctor of philosophy from the Technical Institute of Physics and Chemistry, Chinese Academy of Sciences in 2010. He joined the University of Electronic Science and Technology of China in 2015 after his postdoctoral research in National University of Singapore and Nanyang Technological University between 2010 and 2015. His research focuses on the 2D ferromagnetic materials toward spintronics and valleytronics.

Zhongtai Shi, Master student, received his BSc (Honors) from the University of Electronic Science and Technology of China in 2017. His research focuses on the exciton studies of 2D perovskite CsPbBr3.

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Shi, Z., Muhammad, S., Deng, L. et al. Magnetic-brightening and control of dark exciton in CsPbBr3 perovskite. Sci. China Mater. 63, 1503–1509 (2020). https://doi.org/10.1007/s40843-019-1245-1

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