Issue 22, 2022

Perspective on the scintillating response of CdSe based nanoplatelets heterostructures

Abstract

We explore the effect of shell thickness on the time and spectral response of CdSe/CdS core–crown and CdSe/CdZnS core–shell nanoplatelets (NPLs) under X-ray and intense optical excitation. From their intensity-dependent spectral and timing response, we demonstrate that the exciton–exciton interaction in the bi-exciton (XX) changes from attractive to repulsive when varying the design from core/crown to thick quasi type II core/shell 2D nanostructures. We find that an additional shell layer of 0.4 nm is enough to convert the red-shifted XX emission to non- or blue-shifted emission. Under pulsed X-ray excitation, the scintillation decay dynamics reveal that multiexcitons are generated in all 2D nanostructures, whose presence can hardly be detected in the emission spectra for NPL thicknesses larger than 2 nm. We provide a numerical estimation of the number of scattering events of 35 keV electron as a function of NPL thickness, revealing that the formation of biexcitons with ultra-fast time response is more efficient in thick NPLs. However, this advantage is counterbalanced by a blue-shifted emission of that ultra-fast emission, rendering large NPLs less effective regarding the self-absorption issue.

Graphical abstract: Perspective on the scintillating response of CdSe based nanoplatelets heterostructures

Supplementary files

Article information

Article type
Paper
Submitted
03 6 2022
Accepted
12 9 2022
First published
14 9 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 8341-8350

Perspective on the scintillating response of CdSe based nanoplatelets heterostructures

Z. Meng, B. Mahler, J. Houel, F. Kulzer, A. Vasil'ev and C. Dujardin, Mater. Adv., 2022, 3, 8341 DOI: 10.1039/D2MA00635A

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