Synthesis and Photoluminescent Properties of ZnSe∶Cu/CdS Core/Shell Quantum Dots

WANG Lei; CAO Li-xin; LIU Wei; SU Ge

doi:10.3788/fgxb20133406.0686

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Synthesis and Photoluminescent Properties of ZnSe∶Cu/CdS Core/Shell Quantum Dots

更新时间：2020-08-12

- Synthesis and Photoluminescent Properties of ZnSe∶Cu/CdS Core/Shell Quantum Dots
- Chinese Journal of Luminescence Vol. 34, Issue 6, Pages: 686-691(2013)
- 作者机构：
  
  中国海洋大学材料科学与工程研究院,山东青岛,266100
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20133406.0686
  CLC： O482.31
- Received：01 April 2013，
  
  Revised：16 April 2013，
  
  Published：10 June 2013
- 稿件说明：
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王磊, 曹立新, 柳伟, 苏革. ZnSe∶Cu/CdS核壳量子点的合成及光学性能研究[J]. 发光学报, 2013,34(6): 686-691

WANG Lei, CAO Li-xin, LIU Wei, SU Ge. Synthesis and Photoluminescent Properties of ZnSe∶Cu/CdS Core/Shell Quantum Dots[J]. Chinese Journal of Luminescence, 2013,34(6): 686-691
王磊, 曹立新, 柳伟, 苏革. ZnSe∶Cu/CdS核壳量子点的合成及光学性能研究[J]. 发光学报, 2013,34(6): 686-691 DOI： 10.3788/fgxb20133406.0686.

WANG Lei, CAO Li-xin, LIU Wei, SU Ge. Synthesis and Photoluminescent Properties of ZnSe∶Cu/CdS Core/Shell Quantum Dots[J]. Chinese Journal of Luminescence, 2013,34(6): 686-691 DOI： 10.3788/fgxb20133406.0686.

摘要

以CdS为壳层材料对核水溶性ZnSe:Cu量子点进行包覆

得到ZnSe:Cu/CdS核壳结构的量子点。研究了壳层厚度对ZnSe:Cu量子点光学性能的影响

采用TEM、XRD、PL和UV-Vis手段对所得样品进行表征。实验结果表明:量子点为立方闪锌矿结构

分散性好

形状为球形

经壳层修饰后量子点的粒径由2.7 nm增大到4.0 nm。随着包覆CdS壳层数的增加

量子点的发射和紫外吸收谱红移

说明量子点在长大

证明CdS壳层生长在ZnSe:Cu量子点的表面

形成了核壳结构的ZnSe:Cu/CdS量子点。包覆CdS壳层后ZnSe:Cu量子点的发光强度减弱

但稳定性得到了提高。

Abstract

Water-soluble ZnSe:Cu quantum dots were synthesised in aqueous solution

ZnSe:Cu/CdS core/shell quantum dots(QDs)with different shell thickness were obtained in this paper. The influence of shell thickness on the optical properties of ZnSe:Cu QDs was studied. The samples were characterized by TEM

XRD

PL and UV-Vis. The results showed that ZnSe:Cu/CdS core/shell QDs have a cubic zinc-blende structure and are spherical with good dispersibility. The average grain size increased from 2.7 to 4.0 nm after the shell modification. The redshift of core/shell QDs compared with the core QDs was observed in both the UV-Vis and the PL spectra

which suggested that the size of core/shell QDs increased. The results proved that CdS shell were coated on the surface of ZnSe:Cu QDs and formed the ZnSe:Cu/CdS core/shell structure QDs. The PL intensity of the ZnSe:Cu QDs decreased with higher stability after being coated by CdS shell.

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references

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