Synthesis and Fluorescence Properties of CdSe: Nd and CdSe: Nd@SiO2 Core-Shell Structures

YANG Jun-hong; ZHANG Gao-feng; GAO Jun-fang; YONG Sheng-li; MA Xue-lin; DUAN Jun

doi:10.3788/fgxb20183909.1260

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Synthesis and Fluorescence Properties of CdSe: Nd and CdSe: Nd@SiO₂ Core-Shell Structures

更新时间：2020-08-12

- Synthesis and Fluorescence Properties of CdSe: Nd and CdSe: Nd@SiO₂ Core-Shell Structures
- Chinese Journal of Luminescence Vol. 39, Issue 9, Pages: 1260-1267(2018)
- 作者机构：
  
  包头师范学院化学学院,内蒙古包头,014030
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20183909.1260
  CLC： O635;O482.31
- Received：22 January 2018，
  
  Revised：29 May 2018，
  
  Published Online：24 April 2018，
  
  Published：05 September 2018
- 稿件说明：
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杨峻宏, 张高峰, 高俊芳等. CdSe:Nd纳米晶及CdSe:Nd@SiO2核壳结构的合成及发光性能[J]. 发光学报, 2018,39(9): 1260-1267

YANG Jun-hong, ZHANG Gao-feng, GAO Jun-fang etc. Synthesis and Fluorescence Properties of CdSe: Nd and CdSe: Nd@SiO2 Core-Shell Structures[J]. Chinese Journal of Luminescence, 2018,39(9): 1260-1267
杨峻宏, 张高峰, 高俊芳等. CdSe:Nd纳米晶及CdSe:Nd@SiO2核壳结构的合成及发光性能[J]. 发光学报, 2018,39(9): 1260-1267 DOI： 10.3788/fgxb20183909.1260.

YANG Jun-hong, ZHANG Gao-feng, GAO Jun-fang etc. Synthesis and Fluorescence Properties of CdSe: Nd and CdSe: Nd@SiO2 Core-Shell Structures[J]. Chinese Journal of Luminescence, 2018,39(9): 1260-1267 DOI： 10.3788/fgxb20183909.1260.

摘要

利用有机相法合成Nd

掺杂CdSe纳米晶（CdSe∶Nd），通过X射线粉末衍射（XRD）、透射电镜（TEM）、紫外吸收光光谱及荧光光谱表征，证明Nd

已经成功掺入到CdSe的晶格中。与纯CdSe纳米晶相比，CdSe∶Nd纳米晶的结构仍为立方晶型，且形貌近似球形，均匀分散，粒径约为2~4 nm。紫外吸收峰和荧光发射峰都发生红移，而且掺杂后的CdSe∶Nd纳米晶量子产率也提高，这可能是由于掺杂Nd

引入了新的杂质能级，带隙减小。为了实现CdSe∶Nd纳米晶的可加工性和功能性，通过微乳法合成SiO

壳包覆的CdSe∶Nd纳米球（CdSe∶Nd@SiO

纳米球），CdSe∶Nd@SiO

纳米球呈均匀球形，直径约为100~115 nm，并且包壳后的CdSe∶Nd@SiO

纳米球发射峰（581 nm）与CdSe∶Nd纳米晶（598 nm）相比，发光强度提高且发射峰蓝移，蓝移约为17 nm，可能是因为SiO

壳可以减少纳米晶表面的非辐射跃迁以及改善表面缺陷导致的。

Abstract

CdSe:Nd nanocrystals (CdSe:Nd NCs) were synthesized

via

organic phase method. The objective of this research was to investigate structure

microstructure

optical properties and possible luminescence mechanism of CdSe:Nd and CdSe:Nd@SiO

. It is confirmed that Nd

is successfully incorporated into the crystal lattice of CdSe through XRD

TEM

UV-visible absorption spectroscopy and fluorescence emission. Compared with pure CdSe NCs

CdSe:Nd NCs still have a cubic crystal structure

the lattice constant of CdSe and CdSe:Nd NCs is 0.605 and 0.609 nm

respectively. The lattice of CdSe:Nd constant increases

it may be due to the ionic radius of Nd

is larger than Cd

. When Nd

is incorporated into the crystal lattice of CdSe:Nd NCs

which results in dilation of crystal lattice. CdSe:Nd NCs are monodisperse and spherical particles with an average diameter of 2-4 nm. Both absorption spectrum and emission spectrum red-shift

and the quantum yields of the CdSe:Nd NCs also increase

which may be due to the introduction of new impurity levels and the decrease of the band gap. To enhance the stability and functionality of CdSe:Nd NCs

CdSe:Nd NCs were coated with SiO

(CdSe:Nd@SiO

spheres) and the core-shell SiO

-coated CdSe:Nd NCs (CdSe:Nd@SiO

) were prepared

via

the micro-emulsion method. XRD patterns show that the patterns of CdSe:Nd@SiO

contain the characteristic peak of CdSe:Nd NCs

which proves that CdSe:Nd has entered in the SiO

shell successfully. CdSe:Nd NCs are uniform spherical with an average diameter of 100-115 nm

and CdSe:Nd NCs can be clearly seen in the SiO

shell. The fluorescence emission of CdSe:Nd@SiO

(581 nm) shows a blue-shift compared with CdSe:Nd NCs(598 nm)

possibly because of altered surface properties and reduction of nonradiative transitions.

关键词

Keywords

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