Вышедшие номера
Manganese-Doped ZnS QDs: an Investigation into the Optimal Amount of Doping
Полная версия: 10.1134/S106378262011024X
Tomar S.1,2, Gupta S.2, Mukherjee S.3, Singh A.4, Kumar S.5, Choubey R.K.2
1Applied Science & Humanities Department, ABES Engineering College, Campus-1, 19th KM Stone, NH-24, Ghaziabad U.P.-201009, India
2Department of Applied Physics, Amity Institute of Applied Sciences (AIAS), Amity University, Noida Campus, Sector-125, Noida, Uttar Pradesh, India
3Department of Physics, National Institute of Technology, Patna, Bihar, India
4Department of Physics, Faculty of Natural Sciences Jamia Millia Islamia, Central University, New Delh, India
5Department of Physics, Indira Gandhi University, Meerpur, Rewari, Haryana, India
Email: ravikantchoubey@gmail.com
Поступила в редакцию: 7 июля 2020 г.
Выставление онлайн: 7 августа 2020 г.

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. Keywords: ZnS, Mn, quantum dots, XRD, photoluminescence emission.

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