Manganese-Doped ZnS QDs: an Investigation into the Optimal Amount of Doping

被引:21
|
作者
Tomar, S. [1 ,2 ]
Gupta, S. [2 ]
Mukherjee, S. [3 ]
Singh, A. [4 ]
Kumar, S. [5 ]
Choubey, R. K. [2 ]
机构
[1] ABES Engn Coll, Appl Sci & Humanities Dept, Campus 1,19th KM Stone,NH-24, Ghaziabad 201009, UP, India
[2] Amity Univ, Amity Inst Appl Sci AIAS, Dept Appl Phys, Noida Campus,Sect 125, Noida 201313, Uttar Pradesh, India
[3] Natl Inst Technol, Dept Phys, Patna 800005, Bihar, India
[4] Cent Univ, Fac Nat Sci Jamia Millia Islamia, Dept Phys, New Delhi 110025, India
[5] Indira Gandhi Univ, Dept Phys, Rewari 122502, Haryana, India
关键词
ZnS; Mn; quantum dots; XRD; photoluminescence emission; CHEMICAL BATH DEPOSITION; OPTICAL-PROPERTIES; QUANTUM; PHOTOLUMINESCENCE; FERROMAGNETISM; CO;
D O I
10.1134/S106378262011024X
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
In the present study, undoped and Mn-doped ZnS, Zn1 -xMnxS (x = 0, 0.02, 0.06, 0.10) quantum dots (QDs) were successfully synthesized using the simple co-precipitation method. The synthesized samples were thoroughly studied using X-ray diffraction (XRD), UV-visible absorption, high-resolution transmission electron microscopy (HRTEM) with selected area of the electron diffraction, scanning electron microscope with energy dispersive X-ray spectra, photoluminescence emission (PLE), and Fourier transform infrared spectroscopy. The XRD pattern confirmed the cubic zinc-blende phase at low doping concentration; however, at higher Mn-doping concentration hetaerolite phase formation was observed. The calculated particle size using Debye-Scherrer relation was found between 1.90-2.35 nm, which was also confirmed by HRTEM analysis. The blue shift in the absorption peak of all the prepared ZnS QDs as compared to bulk ZnS was indicative of the formation of nanoparticles and the calculated band gap was in the range of 3.94-4.11 eV. The PLE spectroscopy of the synthesized QDs was performed at the excitation wavelength of 280 nm and corresponding emission spectroscopy confirmed the surface defects in synthesized ZnS QDs.
引用
收藏
页码:1450 / 1458
页数:9
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