Magnetic-brightening and control of dark exciton in CsPbBr3 perovskite
Magnetic-brightening and control of dark exciton in CsPbBr3 perovskite
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CsPbBr3 钙钛矿的磁增亮和暗激子控制
DOI：
10.1007/s40843-019-1245-1
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Bo Peng
中科院分区：
文献类型：
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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
研究溴化铯铅（CsPbBr3）钙钛矿纳米晶体（NCs）的精细结构不仅对理解激子的复合机制至关重要，而且对提高量子光发射器和自旋电子器件的性能也至关重要。本文利用低温磁光致发光（PL）测量，提供了CsPbBr3单晶中暗激子的直接PL光谱特征，并证明了单线态暗激子位于三态亮激子下方~ 20 meV。此外，磁极化法没有测量到明显的极化效应，表明暗激子没有自旋选择性。
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.