Perspective on the scintillating response of CdSe based nanoplatelets heterostructures - Archive ouverte HAL Access content directly
Journal Articles Materials Advances Year : 2022

Perspective on the scintillating response of CdSe based nanoplatelets heterostructures

Zhu Meng
  • Function : Author
Benoit Mahler
Julien Houel
Andrey Vasil'Ev

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.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.
Fichier principal
Vignette du fichier
d2ma00635a.pdf (2.38 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Licence : CC BY NC - Attribution - NonCommercial

Dates and versions

hal-03865098 , version 1 (22-11-2023)

Identifiers

Cite

Zhu Meng, Benoit Mahler, Julien Houel, Florian Kulzer, Andrey Vasil'Ev, et al.. Perspective on the scintillating response of CdSe based nanoplatelets heterostructures. Materials Advances, 2022, 3 (22), pp.8341-8350. ⟨10.1039/d2ma00635a⟩. ⟨hal-03865098⟩
9 View
4 Download

Altmetric

Share

Gmail Facebook X LinkedIn More