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Title: Comparison of structural and luminescence properties of Dy{sub 2}O{sub 3} nanopowders synthesized by co-precipitation and green combustion routes

Highlights: • Dy{sub 2}O{sub 3} nanopowders were prepared by co-precipitation and eco-friendly green combustion route using plant latex. • Both the products show excellent chromaticity coordinates in the white region, which were quite useful for white LED’s. • Thermoluminescence response of the Dy{sub 2}O{sub 3} product prepared by green synthesis was higher when compared to co-precipitation route. • Structural parameters of Dy{sub 2}O{sub 3} were estimated using Rietveld refinement. • The development of nanosize materials using eco-friendly resources was an attractive non-hazardous chemical route. - Abstract: Dysprosium oxide (Dy{sub 2}O{sub 3}) 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 γ-rays. A well resolved glow peak at 353 °C along with less intense peak at 183 °C was observed in GC route while, in CP a single glow peak at 364 °C was observed. The kinetic parameters were estimated using Chen’s glow peak route. Photoluminescence (PL) of Dy{sub 2}O{sub 3} shows peaks at 481, 577,more » 666 and 756 nm which were attributed to Dy{sup 3+} transitions of {sup 4}F{sub 9/2}⟶{sup 6}H{sub 15/2}, {sup 6}H{sub 13/2}, {sup 6}H{sub 11/2} and {sup 6}H{sub 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.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103 (India)
  2. (India)
  3. Department of Chemistry, B.M.S. Institute of Technology, Bangalore 560 064 (India)
  4. Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064 (India)
  5. Vice chancellor, Chhattisgarh Swamy Vivekananda Technical University, North Park Avenue, Sector – 8, Bhilai, Chhattisgarh 490 009 (India)
  6. Department of Physics, Channabasaveshwara Institute of Technology, Gubbi 572 216 (India)
  7. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)
  8. Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054 (India)
Publication Date:
OSTI Identifier:
22348688
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 55; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CRYSTAL STRUCTURE; DYSPROSIUM IONS; DYSPROSIUM OXIDES; NANOSTRUCTURES; PARTICLES; PEAKS; PHOTOLUMINESCENCE; POWDERS; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; THERMOLUMINESCENCE; TRANSMISSION ELECTRON MICROSCOPY