发光学报, 2018, 39 (9): 1260, 网络出版: 2018-09-08   

CdSe∶Nd纳米晶及CdSe∶Nd@SiO2核壳结构的合成及发光性能

Synthesis and Fluorescence Properties of CdSe∶Nd and CdSe∶Nd@SiO2 Core-Shell Structures
作者单位
包头师范学院 化学学院, 内蒙古 包头 014030
摘要
利用有机相法合成Nd3+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Nd3+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Nd3+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SiO2 壳包覆的CdSe∶Nd纳米球(CdSe∶Nd@SiO2 纳米球), CdSe∶Nd@SiO2 纳米球呈均匀球形, 直径约为100~115 nm, 并且包壳后的CdSe∶Nd@SiO2 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SiO2 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@SiO2 . It is confirmed that Nd3+ 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 Nd3+ is larger than Cd2+. When Nd3+ 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 SiO2 (CdSe∶Nd@SiO2 spheres) and the core-shell SiO2 -coated CdSe∶Nd NCs (CdSe∶Nd@SiO2 ) were prepared via the micro-emulsion method. XRD patterns show that the patterns of CdSe∶Nd@SiO2 contain the characteristic peak of CdSe∶Nd NCs, which proves that CdSe∶Nd has entered in the SiO2 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 SiO2 shell. The fluorescence emission of CdSe∶Nd@SiO2 (581 nm) shows a blue-shift compared with CdSe∶Nd NCs(598 nm), possibly because of altered surface properties and reduction of nonradiative transitions.

杨峻宏, 张高峰, 高俊芳, 雍胜利, 马学林, 段军. 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. YANG Jun-hong, ZHANG Gao-feng, GAO Jun-fang, YONG Sheng-li, MA Xue-lin, DUAN Jun. Synthesis and Fluorescence Properties of CdSe∶Nd and CdSe∶Nd@SiO2 Core-Shell Structures[J]. Chinese Journal of Luminescence, 2018, 39(9): 1260.

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