Superfluorescence behavior of excitons in a quantum dot superlattice

doi:10.3969/j.issn.1000-5641.2022.04.017

Abstract

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

CLC Number:

O472+.3

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.

Figures/Tables 3

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