Facile synthesis of high-quality ZnS, CdS, CdZnS, and CdZnS/ZnS core/shell quantum dots: characterization and diffusion mechanism

被引：42

作者：

Liu, Xinmei ^{[1
]}

Jiang, Yang ^{[2
]}

Fu, Fengming ^{[1
]}

Guo, Weimin ^{[1
]}

Huang, Wenyi ^{[1
]}

Li, Lijun ^{[1
]}

机构：

[1] Guangxi Univ Sci & Technol, Dept Biol & Chem Engn, Liuzhou 545006, Guangxi, Peoples R China

[2] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China

来源：

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING | 2013年 / 16卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Semiconductor quantum dots; Synthesis mechanism; Ternary alloy structure; Core/shell quantum dots; LIGHT-EMITTING-DIODES; ZNXCD1-XSE NANOCRYSTALS; LUMINESCENCE; STABILITY; NANOPARTICLES; EMISSION; GROWTH;

D O I：

10.1016/j.mssp.2013.06.007

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Binary CdS and ZnS and ternary CdZnS alloy quantum dots (QDs) were synthesized via a simple, inexpensive, and reproducible route using sulfur, cadmium stearate, and zinc stearate as precursors and N-oleoylmorpholine as the reaction medium and solvent. Both binary and ternary QDs exhibited a narrow size distribution and high crystallinity as confirmed TEM and HRTEM images. The alloy QDs exhibited excellent composition-dependent optical properties and a narrow full-width at half maximum of 19-21 nm. UV-visible absorbance and photoluminescence (PL) emission spectra of the CdZnS QDs showed a blue shift during growth, indicating the formation of alloy QDs. ZnS shells were successively coated onto the alloy core via decomposition of zinc diethyldithiocarbamate at a relatively low temperature. The CdZnS/ZnS core/shell QDs obtained showed a significant increase in size and exhibited strong band edge emission with a significant increase in PL quantum yield. XRD patterns revealed that all the QDs had a zinc blende structure. The QD diffraction peaks gradually shifted to higher angle in the order CdS < CdZnS < CdZnS/ZnS < ZnS. The mechanism for the synthesis of CdZnS alloy and CdZnS/ZnS core/shell QDs is discussed. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：1723 / 1729

页数：7

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