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Size-dependent energy spacing and surface defects of CdSe quantum dots in strong confinement regime

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Abstract

Transmission electron microscopy and UV–Vis spectroscopy can be used to observe the individual crystallite morphology and the origin of optical activity of quantum dots (QDs). CdSe QDs with different sizes were obtained by controlling their growth time, and the estimated sizes of the CdSe QDs ranged from 2.5 to 5.1 nm. The first excitonic absorption and photoluminescence (PL) peak shifted to lower energy with increasing QD size in the strong confinement regime. The PL spectra included a shoulder peak in the spectra of smaller QDs because of preferential adsorption. A comparison of the empirical trends and experimental results provided a fundamental understanding of the size-dependent properties of the CdSe QDs. In addition, time-resolved PL spectra in conjunction with surface characterization results showed that the PL behavior can be explained by the additional contribution of electron–phonon interaction.

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Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2021R1A2C1003074), Graduate University of Science and Technology under grant number GUST.STS.ĐT2019-KTVL03, and the “Research Base Construction Fund Support Program” funded by Jeonbuk National University in 2021.

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Authors and Affiliations

  1. Department of Physics, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju, 54896, Republic of Korea

    Sung Hun Kim & Hong Seok Lee

  2. Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju, 54896, Republic of Korea

    Taeho Shin

  3. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, 100000, Vietnam

    Minh Tan Man

  4. Institute of Theoretical and Applied Research, Duy Tan University, Hanoi, 100000, Vietnam

    Minh Tan Man

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  1. Sung Hun Kim
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  2. Taeho Shin
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Correspondence to Minh Tan Man or Hong Seok Lee.

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Kim, S.H., Shin, T., Man, M.T. et al. Size-dependent energy spacing and surface defects of CdSe quantum dots in strong confinement regime. Appl Nanosci 12, 3297–3302 (2022). https://doi.org/10.1007/s13204-021-02310-8

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  • DOI: https://doi.org/10.1007/s13204-021-02310-8

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