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Measuring the Ultrafast Spectral Diffusion Dynamics of Colloidal CdSe Nanomaterials

Published online by Cambridge University Press:  23 January 2019

Thanh Nhut Do ,
Cheng Zhang ,
Xuanwei Ong ,
Jie Lian ,
Yinthai Chan  and
Howe-Siang Tan Open the ORCID record for Howe-Siang Tan [Opens in a new window]
Thanh Nhut Do
Affiliation:
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore637371
Cheng Zhang
Affiliation:
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore637371
Xuanwei Ong
Affiliation:
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore117543
Jie Lian
Affiliation:
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore117543
Yinthai Chan
Affiliation:
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore117543
Howe-Siang Tan*
Affiliation:
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore637371
*
*(Email: HoweSiang@ntu.edu.sg)
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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.

Keywords

spectroscopynanostructure

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Type
Articles
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MRS Advances , Volume 4 , Issue 1: Characterization, Mechanical Properties and Structure-Property Relationships , 2019 , pp. 1 - 7
Copyright
Copyright © Materials Research Society 2019 

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