Magnetic Effect of Dopants on Bright and Dark Excitons in Strongly Confined Mn-Doped CsPbI3 Quantum Dots Academic Article uri icon

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 list (cited authors)

  • Qiao, T., Liu, X., Rossi, D., Khurana, M., Lin, Y., Wen, J., ... Son, D. H.

complete list of authors

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

publication date

  • January 1, 2021 11:11 AM