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Comparison of structural and luminescence properties of Dy2O3 nanopowders synthesized by co-precipitation and green combustion routes

Chandrasekhar, M and Nagabhushana, H and Sudheerkumar, KH and Dhananjaya, N and Sharma, SC and Kavyashree, D and Shivakumara, C and Nagabhushana, BM (2014) Comparison of structural and luminescence properties of Dy2O3 nanopowders synthesized by co-precipitation and green combustion routes. In: MATERIALS RESEARCH BULLETIN, 55 . pp. 237-245.

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Official URL: http://dx.doi.org/10.1016/j.materresbull.2014.04.0...

Abstract

Dysprosium oxide (Dy2O3) nanopowders were prepared by co-precipitation (CP) and eco-friendly green combustion (GC) routes. SEM micrographs prepared by CP route show smooth rods with various lengths and diameters while, GC route show porous, agglomerated particles. The results were further confirmed by TEM. Thermoluminescence (TL) responses of the nanopowder prepared by both the routes were studied using gamma-rays. A well resolved glow peak at 353 degrees C along with less intense peak at 183 degrees C was observed in GC route while, in CP a single glow peak at 364 degrees C was observed. The kinetic parameters were estimated using Chen's glow peak route. Photoluminescence (PL) of Dy2O3 shows peaks at 481, 577,666 and 756 nm which were attributed to Dy3+ transitions of F-4(9/2)-H-6(15/2), H-6(11/2), H-6(11/2) and H-6(9/2), respectively. Color co-ordinate values were located in the white region as a result the product may be useful for the fabrication of WLED'S. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND.
Keywords: Chemical synthesis; Phosphor; Luminescence; Crystal structure
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 19 Aug 2014 11:26
Last Modified: 19 Aug 2014 11:26
URI: http://eprints.iisc.ac.in/id/eprint/49631

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