Thermoluminescence and EPR studies of nanocrystalline Nd2O3:Ni2+ phosphor

Umesh, B and Eraiah, B and Nagabhushana, H and Sharma, SC and Sunitha, DV and Nagabhushana, BM and Shivakumara, C and Rao, JL and Chakradhar, RPS (2012) Thermoluminescence and EPR studies of nanocrystalline Nd2O3:Ni2+ phosphor. In: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 93 . pp. 228-234.

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Abstract

Nanocrystalline Nd2O3:Ni2+ (2 mol%) phosphor has been prepared by a low temperature (similar to 400 degrees C) solution combustion method, in a very short time (<5 min). Powder X-ray diffraction results confirm the single hexagonal phase of nanopowders. Scanning electron micrographs show that nanophosphor has porous nature and the particles are agglomerated. Transmission electron microscopy confirms the nanosize (20-25 nm) of the crystallites. The electron paramagnetic resonance (EPR) spectrum exhibits a symmetric absorption at g approximate to 2.77 which suggests that the site symmetry around Ni2+ ions is predominantly octahedral. The number of spins participating in resonance (N) and the paramagnetic susceptibility (chi) has been evaluated. Raman study show major peaks, which are assigned to F-g and combination of A(g) + E-g modes. Thermoluminescence (TL) studies reveal well resolved glow peaks at 169 degrees C along with shoulder peak at around 236 degrees C. The activation energy (E in eV), order of kinetics (b) and frequency factor (s) were estimated using glow peak shape method. It is observed that the glow peak intensity at 169 degrees C increases linearly with gamma-dose which suggest that Nd2O3:Ni2+ is suitable for radiation dosimetry applications. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Publisher:	Science Direct
Additional Information:	Copyright for this article belongs to Elsevier B V
Keywords:	Nanophosphor;Thermoluminescence;Gamma irradiation;XRD;SEM;EPR
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	18 Jul 2012 04:47
Last Modified:	01 Mar 2019 06:55
URI:	http://eprints.iisc.ac.in/id/eprint/44619

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