Brightening of Dark States in CsPbBr3 Quantum Dots Caused by Light–Induced Magnetism

Lohmann, Sven‐Hendrik; Cai, Tong; Morrow, Darien J.; Chen, Ou; Ma, Xuedan

doi:10.1002/smll.202101527

Title: Brightening of Dark States in CsPbBr₃ Quantum Dots Caused by Light–Induced Magnetism

Journal Article · Sun Aug 08 00:00:00 EDT 2021 · Small

DOI:https://doi.org/10.1002/smll.202101527· OSTI ID:1864307

Lohmann, Sven‐Hendrik ^[1]; Cai, Tong ^[2]; Morrow, Darien J. ^[1]; Chen, Ou ^[2];

^[3]

Argonne National Lab. (ANL), Lemont, IL (United States)
Brown Univ., Providence, RI (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, IL (United States)

Lead halide perovskite quantum dots (QDs) have shown great potential for optoelectronic and quantum photonic applications. Although controversy remains about the electronic fine structures of bulk perovskites due to the strong spin-orbit coupling affecting the conduction bands, compelling evidence indicates that the ground states of perovskite QDs remain dark, limiting their applications in optoelectronic devices. In this study, it is demonstrated that photoexcitation can induce large intrinsic magnetic fields in Mn-doped CsPbBr₃ perovskite QDs. Equivalent to applying an external magnetic field, the light-induced field causes giant Zeeman splitting to the bright triplet states and brightens the dark singlet ground state, thus effectively rendering a partially bright ground state in the doped QDs. These findings here may contribute to the understanding of the electronic fine structures in perovskite QDs and demonstrate a potential approach for creating semiconductor nanostructures that can serve as bright light sources.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; DMR-1905990; DMR-1943930; 80NSSC19M0045

OSTI ID:: 1864307

Journal Information:: Small, Vol. 17, Issue 37; ISSN 1613-6810

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Brightening of Dark States in CsPbBr3 Quantum Dots Caused by Light–Induced Magnetism

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Title: Brightening of Dark States in CsPbBr₃ Quantum Dots Caused by Light–Induced Magnetism