Tunable Visible Emission of Ag-Doped CdZnS Alloy Quantum Dots.

Nanoscale Research Letters
Ruchi SethiAc Pandey

Abstract

Highly luminescent Ag-ion-doped Cd1-xZnxS (0 ≤ x ≤ 1) alloy nanocrystals were successfully synthesized by a novel wet chemical precipitation method. Influence of dopant concentration and the Zn/Cd stoichiometric variations in doped alloy nanocrystals have been investigated. The samples were characterized by X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) to investigate the size and structure of the as prepared nanocrystals. A shift in LO phonon modes from micro-Raman investigations and the elemental analysis from the energy dispersive X-ray analysis (EDAX) confirms the stoichiometry of the final product. The average crystallite size was found increasing from 1.0 to 1.4 nm with gradual increase in Ag doping. It was observed that photoluminescence (PL) intensity corresponding to Ag impurity (570 nm), relative to the other two bands 480 and 520 nm that originates due to native defects, enhanced and showed slight red shift with increasing silver doping. In addition, decrease in the band gap energy of the doped nanocrystals indicates that the introduction of dopant ion in the host material influence the particle size of the nanocrystals. The composition dependent bandgap engineering in CdZnS:Ag ...Continue Reading

References

Jun 5, 2003·Journal of the American Chemical Society·Robert E Bailey, Shuming Nie
Oct 30, 2003·Journal of the American Chemical Society·Xinhua ZhongMingyong Han
Nov 26, 2009·Journal of Nanoscience and Nanotechnology·Ruchi SethiA C Pandey

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Citations

Apr 15, 2016·Scientific Reports·Tong-Tong XuanHui-Li Li
Jul 1, 2020·Nanomaterials·Dongxiang LuoBaiquan Liu
Jan 16, 2021·Journal of Colloid and Interface Science·Li-Jiao GaoZhong-Yong Yuan
May 24, 2017··T. V. VineeshkumarD. Rithesh Raj

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Methods Mentioned

BETA
X-Ray
electron diffraction
atomic force microscopy

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