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      Developing Lattice Matched ZnMgSe Shells on InZnP Quantum Dots for Phosphor Applications

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          Abstract

          Indium phosphide quantum dots (QDs) have drawn attention as alternatives to cadmium- and lead-based QDs that are currently used as phosphors in lamps and displays. The main drawbacks of InP QDs are, in general, a lower photoluminescence quantum yield (PLQY), a decreased color purity, and poor chemical stability. In this research, we attempted to increase the PLQY and stability of indium phosphide QDs by developing lattice matched InP/MgSe core–shell nanoheterostructures. The choice of MgSe comes from the fact that, in theory, it has a near-perfect lattice match with InP, provided MgSe is grown in the zinc blende crystal structure, which can be achieved by alloying with zinc. To retain lattice matching, we used Zn in both the core and shell and we fabricated InZnP/Zn x Mg 1– x Se core/shell QDs. To identify the most suitable conditions for the shell growth, we first developed a synthesis route to Zn x Mg 1– x Se nanocrystals (NCs) wherein Mg is effectively incorporated. Our optimized procedure was employed for the successful growth of Zn x Mg 1– x Se shells around In(Zn)P QDs. The corresponding core/shell systems exhibit PLQYs higher than those of the starting In(Zn)P QDs and, more importantly, a higher color purity upon increasing the Mg content. The results are discussed in the context of a reduced density of interface states upon using better lattice matched Zn x Mg 1– x Se shells.

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          Most cited references 37

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          Semiconductor Clusters, Nanocrystals, and Quantum Dots

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            Colloidal quantum-dot light-emitting diodes with metal-oxide charge transport layers

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              Synthesis and properties of colloidal heteronanocrystals.

               Celso Mello (2011)
              Colloidal heteronanocrystals (HNCs) can be regarded as solution-grown inorganic-organic hybrid nanomaterials, since they consist of inorganic nanoparticles that are coated with a layer of organic ligand molecules. The hybrid nature of these nanostructures provides great flexibility in engineering their physical and chemical properties. The inorganic particles are heterostructured, i.e. they comprise two (or more) different materials joined together, what gives them remarkable and unique properties that can be controlled by the composition, size and shape of each component of the HNC. The interaction between the inorganic component and the organic ligand molecules allows the size and shape of the HNCs to be controlled and gives rise to novel properties. Moreover, the organic surfactant layer opens up the possibility of surface chemistry manipulation, making it possible to tailor a number of properties. These features have turned colloidal HNCs into promising materials for a number of applications, spurring a growing interest on the investigation of their preparation and properties. This critical review provides an overview of recent developments in this rapidly expanding field, with emphasis on semiconductor HNCs (e.g., quantum dots and quantum rods). In addition to defining the state of the art and highlighting the key issues in the field, this review addresses the fundamental physical and chemical principles needed to understand the properties and preparation of colloidal HNCs (283 references).
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                Author and article information

                Journal
                ACS Appl Nano Mater
                ACS Appl Nano Mater
                an
                aanmf6
                ACS Applied Nano Materials
                American Chemical Society
                2574-0970
                16 March 2020
                24 April 2020
                : 3
                : 4
                : 3859-3867
                Affiliations
                []Optoelectronic Materials Section, Faculty of Applied Sciences, Delft University of Technology , Van der Maasweg 9, 2629HZ Delft, The Netherlands
                []Department of Nanochemistry, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
                [§ ]Electron Microscopy for Materials Science (EMAT), Department of Physics, University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium
                Author notes
                Article
                10.1021/acsanm.0c00583
                7187636
                Copyright © 2020 American Chemical Society

                This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License, which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.

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                Custom metadata
                an0c00583
                an0c00583

                mgse, quantum dots, phosphor, lattice matching, core−shell, inp

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