Spectroscopic Study of Mn2+ Doped PbS Nanocrystals

• Published in: Applied magnetic resonance Vol. 50; no. 6; pp. 785 - 795
• Main Authors: Kripal, Ram, Rudowicz, C., Tripathi, Upendra Mani
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01-06-2019; Springer Nature B.V
• Subjects: Absorption spectra; Aqueous solutions; Atoms and Molecules in Strong Fields; Chemical analysis; Chemical synthesis; Crystallites; Electron paramagnetic resonance; Energy bands; Energy gap; High resolution electron microscopy; Laser Matter Interaction; Lead; Magnetic properties; Morphology; Nanocrystals; Organic Chemistry; Original Paper; Parameters; Photoluminescence; Physical Chemistry; Physical properties; Physics; Physics and Astronomy; Quantum dots; Solid State Physics; Spectroscopy/Spectrometry; Spectrum analysis; Transmission electron microscopy
• ISSN: 0937-9347; 1613-7507
• DOI: 10.1007/s00723-018-1068-0

Mn
2+
doped PbS (PbS:Mn
2+
) semiconductor nanocrystals have been synthesized by standard chemical method and characterized using various techniques for possible applications in quantum dots. This work describes new physical properties of these nanocrystals that have emerged from our investigations. The PbS:Mn
2+
nanocrystals have cubic structure (space Group
Fm3m
) and the average crystallite size lies between 5 and 10 nm as characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) analysis. The structural properties of PbS:Mn
2+
nanoparticles are also studied by UV/Vis absorption spectrum and High-Resolution Transmission Electron Microscopy (HRTEM). The quantitative chemical analysis of pure and Mn
2+
doped PbS nanocrystals has been done by Energy Dispersive Spectroscopy (EDS) spectra. The energy band gaps have been determined by UV/Vis absorption study using Tauc Plot as (in eV):1.79, 1.90, 2.23, and 2.39 for Mn
2+
concentration equal to 0, 0.05, 0.26, and 0.52%, respectively. The luminescence behavior of the nanocrystals has been studied by photoluminescence (PL) spectra. The magnetic and electronic properties of PbS:Mn
2+
nanocrystals were studied using Electron Paramagnetic Resonance (EPR) spectroscopy. Analysis of EPR spectra enabled determination of the electronic
g
-factor, the second-rank axial zero-field splitting parameter
D
and the hyperfine parameter
A
.