EPR and Optical Properties of UV-B Radiation-Emitting Gd 3+ -Doped BaLa 2 ZnO 5 Host Prepared by Sol�Gel Method

Singh, V and Halappa, P and Singh, N and Pathak, MS and Shivakumara, C and Natarajan, V (2019) EPR and Optical Properties of UV-B Radiation-Emitting Gd 3+ -Doped BaLa 2 ZnO 5 Host Prepared by Sol�Gel Method. In: Journal of Electronic Materials .

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Abstract

A series of trivalent gadolinium ion-doped BaLa 2 ZnO 5 phosphors was prepared by the sol�gel technique. Phase purity and crystal structure were confirmed by the Rietveld refinement. The morphology of the sample was studied by scanning electron microscopy. The effect of Gd 3+ concentration on the luminescence of the BaLa 2�x Gd x ZnO 5 (x = 0.01 � x � 0.15) samples was investigated by photoluminescence spectra. Under excitation at 273 nm, all the samples showed ultraviolet emission near 314 nm, generated by the 6 P 7/2 � 8 S 7/2 transition of Gd 3+ ions. It was found that the emission intensity increased with the concentration of Gd 3+ ions up to 0.15 mol without concentration quenching. The electron paramagnetic resonance spectra of the Gd 3+ ion-doped BaLa 2 ZnO 5 phosphors indicated that the dopant ions occupied slightly distorted La 3+ sites in the host lattice. Both the PL and EPR studies describe the excited and ground-state features of Gd 3+ ions in the BaLa 2 ZnO 5 host lattice. © 2019, The Minerals, Metals & Materials Society.

Item Type:	Journal Article
Publication:	Journal of Electronic Materials
Publisher:	Springer New York LLC
Additional Information:	Copyright for this article belongs to Springer New York LLC.
Keywords:	Barium compounds; Crystal structure; Excited states; Ground state; Ions; Lanthanum compounds; Optical properties; Paramagnetic resonance; Phosphors; Photoluminescence; Rietveld refinement; Scanning electron microscopy; Sols; Zinc compounds, BaLa2ZnO5; Concentration quenching; Electron paramagnetic resonance spectrum; Emission intensity; Gel technique; Photoluminescence spectrum; Ultraviolet emission; UVB radiation, Gadolinium compounds
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	09 Apr 2019 06:36
Last Modified:	09 Apr 2019 06:36
URI:	http://eprints.iisc.ac.in/id/eprint/62177

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