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State-Resolved Investigation of Optical Gain and Exciton Dynamics in CdSe Quantum Dots

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Abstract:

Semiconductor quantum dots (QDs) exhibit significant potential for laser applications, where a thorough understanding of their optical gain properties and excitonic dynamics is crucial for performance optimization. In this study, state-resolved pump-probe transient spectroscopy was employed to investigate the optical gain and exciton dynamics in CdSe QDs. The results reveal that the gain threshold increases with pumping photon energy, attributed to the competition between surface trapping and intraband relaxation, as well as to the increased biexciton binding energy associated with higher-energy excitonic charge distributions. Notably, the biexciton binding energy reverses from negative to positive values with increasing pump energy, a transition that underpins the observed rise in gain threshold. Additionally, time-resolved decay curves demonstrate accelerated excitonic recombination at higher pump fluences, indicating a greater proportion of biexcitons relative to single excitons. These findings provide valuable insights for tailoring optical gain in quantized nanostructures and optimizing QD-based laser devices.

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Journal of Nano Research Vol. 91 View Preview

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Periodical:

Journal of Nano Research (Volume 91)

Pages:

67-76

DOI:

https://doi.org/10.4028/p-etHAi3

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Online since:

March 2026

Authors:

Xia Yu Zhu, Meng Qi Liao, Yi Ting He, Zhi Tao Wang, Bo Li*

Keywords:

Exciton Dynamics, Optical Gain, Quantum Dots, State-Resolved Transient Spectroscopy, Threshold

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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