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Optical band gap, Urbach energy and Defect related Photoluminescence in Ni0.95 Al0.05O Nanostructure

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Published under licence by IOP Publishing Ltd
, , Citation M. Naseem Siddique et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 577 012036 DOI 10.1088/1757-899X/577/1/012036

1757-899X/577/1/012036

Abstract

The Ni1−xAlxO (x = 0.05) nanocrystalline synthesized by chemical route using sol gel method calcined at 600 °C. Scanning electron microscopy (SEM) has been carried out to study the morphology for our sample. In addition, UV-visible spectroscopy has been carried out to determine the optical band-gap energy (3.92 eV) via Tauc model with associated Urbach (EU) energy (1.78 eV) that confirms the increased disorder with Al (x=0.05) incorporation into NiO lattice. The deconvoluted PL spectrum using Gaussian function of sample exhibits violet and green emission when NiO is doped with Al (x=0.05) which are indicative of Ni interstitial (Nii) and oxygen vacancy (Vo), respectively.

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10.1088/1757-899X/577/1/012036