Journal of East China Normal University(Natural Science) >

2022 , Vol. 2022 >Issue 4: 163 - 168

DOI: https://doi.org/10.3969/j.issn.1000-5641.2022.04.017

Physics and Electronics

Superfluorescence behavior of excitons in a quantum dot superlattice

  • Jiqing TAN ,
  • Qiangqiang WANG ,
  • Wei XIE
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  • School of Physics and Electronic Science, East China Normal University, Shanghai　200241, China

Received date: 2021-05-19

  Accepted date: 2021-12-30

  Online published: 2022-07-19

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Abstract

In this study, photoluminescence spectra are studied in perovskite quantum dot superlattices based on two-photon absorption processes at 10 K. The dynamics of excitons is obtained using a time-resolved photoluminescence detection system. The sample exhibits typical superfluorescence characteristics in the single-photon excitation case: When the pumping power increases, the transient peak intensity increases nonlinearly, and the radiation lifetime decreases rapidly. Meanwhile, the intensities of the two-photon absorption fluorescence spectra are proportional to the square of the excitation power, and the dynamics of excitons under the two-photon absorption case exhibits the same characteristics as those in the single-photon excitation case. Thus, when the excitation density reaches a certain intensity, two-photon absorption can also induce a superfluorescence process.

Key words： quantum dot superlattice; superfluorescence; two-photon absorption

Cite this article

Jiqing TAN , Qiangqiang WANG , Wei XIE . Superfluorescence behavior of excitons in a quantum dot superlattice[J]. Journal of East China Normal University(Natural Science), 2022 , 2022(4) : 163 -168 . DOI: 10.3969/j.issn.1000-5641.2022.04.017

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