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Measuring the Ultrafast Spectral Diffusion Dynamics of Colloidal CdSe Nanomaterials

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Abstract

We use ultrafast coherent two-dimensional electronic spectroscopy (2DES) to study the ultrafast spectral diffusion dynamics of colloidal CdSe quantum dots (QDs) and CdSe nanoplatelets (NPLs). The Center Line Slope (CLS) and Nodal Line Slope (NLS) techniques were employed to analyse the 2DES spectra. We show that no spectral diffusion dynamics occurs for the CdSe QDs. On the other hand, spectral diffusion was observed in the CdSe 5 mono-layers NPLs heavy-hole transition. The normalized Frequency Fluctuation Correlation Function (FFCF) of the CdSe NPLs heavy-hole transition was measured to have a major fast decay component at 140 fs.

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Authors and Affiliations

  1. Division of Chemistry and Biological Chemistry, , School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371

    Thanh Nhut Do, Cheng Zhang & Howe-Siang Tan

  2. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543

    Xuanwei Ong, Jie Lian & Yinthai Chan

Authors
  1. Thanh Nhut Do
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  2. Cheng Zhang
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  3. Xuanwei Ong
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  4. Jie Lian
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  5. Yinthai Chan
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  6. Howe-Siang Tan
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Do, T.N., Zhang, C., Ong, X. et al. Measuring the Ultrafast Spectral Diffusion Dynamics of Colloidal CdSe Nanomaterials. MRS Advances 4, 1–7 (2019). https://doi.org/10.1557/adv.2019.38

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