Magnetic Effect of Dopants on Bright and Dark Excitons in Strongly Confined Mn-Doped CsPbI3Quantum Dots

Tian Qiao; Xiaohan Liu; Daniel Rossi; Mohit Khurana; Yulin Lin; Jianguo Wen; Jinwoo Cheon; Alexey V. Akimov; Dong Hee Son

doi:10.1021/acs.nanolett.1c03114

Magnetic Effect of Dopants on Bright and Dark Excitons in Strongly Confined Mn-Doped CsPbI₃Quantum Dots

Tian Qiao, Xiaohan Liu, Daniel Rossi, Mohit Khurana, Yulin Lin, Jianguo Wen, Jinwoo Cheon, Alexey V. Akimov, Dong Hee Son

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We investigated the magnetic effect of Mn2+ ions on an exciton of Mn-doped CsPbI3 quantum dots (QDs), where we looked for the signatures of an exciton magnetic polaron known to produce a large effective magnetic field in Mn-doped CdSe QDs. In contrast to Mn-doped CdSe QDs that can produce ∼100 T of magnetic field upon photoexcitation, manifested as a large change in the energy and relaxation dynamics of a bright exciton, Mn-doped CsPbI3 QDs exhibited little influence of a magnetic dopant on the behavior of a bright exciton. However, a μs-lived dark exciton in CsPbI3 QDs showed 40% faster decay in the presence of Mn2+, equivalent to the effect of ∼3 T of an external magnetic field. While further study is necessary to fully understand the origin of the large difference in the magneto-optic property of an exciton in two systems, we consider that the difference in antiferromagnetic coupling of the dopants is an important contributing factor.

Original language	English
Pages (from-to)	9543-9550
Number of pages	8
Journal	Nano letters
Volume	21
Issue number	22
DOIs	https://doi.org/10.1021/acs.nanolett.1c03114
Publication status	Published - 2021 Nov 24

Bibliographical note

Funding Information:
D.H.S. and A.A. acknowledge the National Science Foundation (CHE-2003961), Welch Foundation (A-1639) and X-grants from Texas A&M University for financial support. J.C. acknowledges Institute for Basic Science (IBS-R026-D1) for financial support. The authors thank Dr. Nattamai Bhuvanesh for assistance with XRD, Dr. Trevor Latendresse with SQUID, Trevor Latendresse, Dr. Vladimir Bakhmoutov and Dr. David Powers for EPR measurement. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Publisher Copyright:
© 2021 American Chemical Society.

All Science Journal Classification (ASJC) codes

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

Access to Document

10.1021/acs.nanolett.1c03114

Cite this

@article{ceae5c7364fd41c4b84c6fcaec100c69,

title = "Magnetic Effect of Dopants on Bright and Dark Excitons in Strongly Confined Mn-Doped CsPbI3Quantum Dots",

abstract = "We investigated the magnetic effect of Mn2+ ions on an exciton of Mn-doped CsPbI3 quantum dots (QDs), where we looked for the signatures of an exciton magnetic polaron known to produce a large effective magnetic field in Mn-doped CdSe QDs. In contrast to Mn-doped CdSe QDs that can produce ∼100 T of magnetic field upon photoexcitation, manifested as a large change in the energy and relaxation dynamics of a bright exciton, Mn-doped CsPbI3 QDs exhibited little influence of a magnetic dopant on the behavior of a bright exciton. However, a μs-lived dark exciton in CsPbI3 QDs showed 40% faster decay in the presence of Mn2+, equivalent to the effect of ∼3 T of an external magnetic field. While further study is necessary to fully understand the origin of the large difference in the magneto-optic property of an exciton in two systems, we consider that the difference in antiferromagnetic coupling of the dopants is an important contributing factor.",

author = "Tian Qiao and Xiaohan Liu and Daniel Rossi and Mohit Khurana and Yulin Lin and Jianguo Wen and Jinwoo Cheon and Akimov, {Alexey V.} and Son, {Dong Hee}",

note = "Funding Information: D.H.S. and A.A. acknowledge the National Science Foundation (CHE-2003961), Welch Foundation (A-1639) and X-grants from Texas A&M University for financial support. J.C. acknowledges Institute for Basic Science (IBS-R026-D1) for financial support. The authors thank Dr. Nattamai Bhuvanesh for assistance with XRD, Dr. Trevor Latendresse with SQUID, Trevor Latendresse, Dr. Vladimir Bakhmoutov and Dr. David Powers for EPR measurement. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

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T1 - Magnetic Effect of Dopants on Bright and Dark Excitons in Strongly Confined Mn-Doped CsPbI3Quantum Dots

AU - Qiao, Tian

AU - Liu, Xiaohan

AU - Rossi, Daniel

AU - Khurana, Mohit

AU - Lin, Yulin

AU - Wen, Jianguo

AU - Cheon, Jinwoo

AU - Akimov, Alexey V.

AU - Son, Dong Hee

N1 - Funding Information: D.H.S. and A.A. acknowledge the National Science Foundation (CHE-2003961), Welch Foundation (A-1639) and X-grants from Texas A&M University for financial support. J.C. acknowledges Institute for Basic Science (IBS-R026-D1) for financial support. The authors thank Dr. Nattamai Bhuvanesh for assistance with XRD, Dr. Trevor Latendresse with SQUID, Trevor Latendresse, Dr. Vladimir Bakhmoutov and Dr. David Powers for EPR measurement. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Publisher Copyright: © 2021 American Chemical Society.

PY - 2021/11/24

Y1 - 2021/11/24

N2 - We investigated the magnetic effect of Mn2+ ions on an exciton of Mn-doped CsPbI3 quantum dots (QDs), where we looked for the signatures of an exciton magnetic polaron known to produce a large effective magnetic field in Mn-doped CdSe QDs. In contrast to Mn-doped CdSe QDs that can produce ∼100 T of magnetic field upon photoexcitation, manifested as a large change in the energy and relaxation dynamics of a bright exciton, Mn-doped CsPbI3 QDs exhibited little influence of a magnetic dopant on the behavior of a bright exciton. However, a μs-lived dark exciton in CsPbI3 QDs showed 40% faster decay in the presence of Mn2+, equivalent to the effect of ∼3 T of an external magnetic field. While further study is necessary to fully understand the origin of the large difference in the magneto-optic property of an exciton in two systems, we consider that the difference in antiferromagnetic coupling of the dopants is an important contributing factor.

AB - We investigated the magnetic effect of Mn2+ ions on an exciton of Mn-doped CsPbI3 quantum dots (QDs), where we looked for the signatures of an exciton magnetic polaron known to produce a large effective magnetic field in Mn-doped CdSe QDs. In contrast to Mn-doped CdSe QDs that can produce ∼100 T of magnetic field upon photoexcitation, manifested as a large change in the energy and relaxation dynamics of a bright exciton, Mn-doped CsPbI3 QDs exhibited little influence of a magnetic dopant on the behavior of a bright exciton. However, a μs-lived dark exciton in CsPbI3 QDs showed 40% faster decay in the presence of Mn2+, equivalent to the effect of ∼3 T of an external magnetic field. While further study is necessary to fully understand the origin of the large difference in the magneto-optic property of an exciton in two systems, we consider that the difference in antiferromagnetic coupling of the dopants is an important contributing factor.

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