Spectroscopic investigations of Fe3+ doped poly vinyl alcohol (PVA) capped ZnSe nanoparticles

Fe3+ doped poly vinyl alcohol (PVA) capped ZnSe nanoparticles have been synthesized by using chemical method at room temperature. The prepared sample is characterized by X-ray diffraction, optical, photoluminescence (PL), electron paramagnetic resonance (EPR) and FT-IR techniques. Different physical parameters are evaluated by using measured values of refractive index and density. From the X-ray diffraction pattern, the average crystallite size is calculated by using Scherrer’s formula and it is about 9 nm. Optical absorption spectrum reveals that the Fe3+ ion enter into the lattice as octahedral symmetry. Crystal field (Dq) and inter-electronic repulsion parameters (B, C) are evaluated for Fe3+ doped ZnSe nanoparticles as Dq = 720, B = 720 and C = 2500 cm−1. Photoluminescence spectrum of Fe3+ doped ZnSe exhibits emission bands in UV and yellow regions. EPR spectrum showed various resonance signals at g = 7.3, 3.5 and 2.0. FT-IR spectrum of Fe3+ doped PVA capped ZnSe indicates the presence of O–H, C–H, C C and CO molecular groups.

The optical absorption spectrum of Fe3+ doped ZnSe nanoparticles showed four absorption bands at 690, 610, 518 and 420 nm which are the characteristic of Fe3+ ions in octahedral site symmetry.Figure optionsDownload as PowerPoint slideHighlights
► By measuring refractive index and density different physical parameters are evaluated.
► X-ray diffraction indicates the prepared sample is nano sized.
► Optical studies reveal the site symmetry is octahedral.
► EPR spectrum exhibited resonance signals at g-values of 7.3, 3.5 and 2.0.