Structural and optical properties of alloyed quaternary CdSeTeS core and CdSeTeS/ZnS core-shell quantum dots

JOURNAL OF ALLOYS AND COMPOUNDS

卷:645

Article

Adegoke, Oluwasesan¹  Nyokong, Tebello²  Forbes, Patricia B. C.¹ 

[1] Univ Pretoria, Fac Nat & Agr Sci, Dept Chem, ZA-0002 Pretoria, South Africa

[2] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa

关键词: Quantum dots;    Core/shell;    Photoluminescence;    Quantum yield;    Alloy;   

DOI  :  10.1016/j.jallcom.2015.05.083

来源: Elsevier

【 摘 要 】

Synthesis of fluorescent alloyed quantum dots (QDs) with unique optical properties suitable for a wide array of chemical, physical and biological applications is of research interest. In this work, highly luminescent and photostable alloyed quaternary CdSeTeS core QDs of two different sizes were fabricated via the organometallic hot-injection synthetic route. Characterization of the nanocrystals were performed using TEM, XRD, UV/vis and fluorescence spectrophotometric techniques. We have demonstrated in this work that the well fabricated alloyed quaternary CdSeTeS core QDs possess unique optical properties that are advantageous over conventional core/shell systems. Formation of the CdSeTeS/ZnS core/shell with the desired optical properties comes with a number of challenges, hence the advantages of the quaternary alloyed core over the core/shell QDs are (i) avoidance of the challenging process of determining the proper shell thickness which can provide the desired optical properties in the core/shell system and (ii) avoidance of the lattice-induced mismatch between the core and the shell material which can either lead to incomplete exciton confinement or dislocation at the core/shell interface. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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