Investigation of the internal heterostructure of highly luminescent quantum dot-quantum well nanocrystals

Journal of the American Chemical Society
Pralay K SantraD D Sarma

Abstract

In this paper, we report on the growth and characterization of quantum dot-quantum well nanostructures with photoluminescence (PL) that is tunable over the visible range. The material exhibits a PL efficiency as high as approximately 60% and is prepared by reacting ZnS nanocrystals in turn with precursors for CdSe and ZnS in an attempt to form a simple "ZnS/CdSe/ZnS quantum-well structure". Through the use of synchrotron radiation-based photoelectron spectroscopy in conjunction with detailed overall compositional analysis and correlation with the size of the final composite nanostructure, the internal structure of the composite nanocrystals is shown to consist of a graded alloy core whose composition gradually changes from ZnS at the very center to CdSe at the onset of a CdSe layer. The outer shell is ZnS with a sharp interface, probably reflecting the relative thermodynamic stabilities of the parent binary phases. These contrasting aspects of the internal structure are discussed in terms of the various reactivities and are shown to be crucial for understanding the optical properties of such complex heterostructured nanomaterials.

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Citations

Apr 22, 2017·The Journal of Physical Chemistry Letters·G Krishnamurthy Grandhi, Ranjani Viswanatha
Mar 25, 2011·Advanced Materials·Sucheta SenguptaSomobrata Acharya
Jan 20, 2015·Angewandte Chemie·Ali Hossain KhanSomobrata Acharya
Apr 12, 2013·Angewandte Chemie·Zhuolei ZhangWensheng Yang
Jan 6, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·David J H CantWendy R Flavell
Jan 13, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Raquel E GalianJulia Pérez-Prieto
Mar 23, 2011·Journal of the American Chemical Society·Javeed AkhtarPaul O'Brien
May 22, 2018·The Journal of Physical Chemistry Letters·María AcebrónBeatriz H Juárez

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