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Title: MgO:Dy{sup 3+} nanophosphor: Self ignition route, characterization and its photoluminescence properties

For the first time series of MgO phosphors doped with different concentrations of Dy{sup 3+} (1–9 mol%) were prepared by solution combustion method using glycine as a fuel. The final products were well characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. The powder X-ray diffraction patterns of the as-formed product show single cubic phase. The crystallite size estimated using Scherrer's method was found to be in the range 5–15 nm and the same was confirmed by transmission electron microscopy result. Photoluminescence properties of Dy{sup 3+} (1–9 mol%) doped MgO for near ultra violet excitation (325 nm) was studied in order to investigate the possibility of its use in white light emitting diode applications. The emission spectra consists of intra 4f transitions of Dy{sup 3+}, namely {sup 4}F{sub 9/2} → {sup 6}H{sub 15/2} (483 nm), and {sup 4}F{sub 9/2} → {sup 6}H{sub 13/2} (573 nm). Further, the emission at 573 nm shows strong yellow emission and can be applied to the yellow emission of phosphor for the application for near ultraviolet excitation. The intensity of yellow emission was attributed to intrinsic defects, especially oxygen-vacancies, which could assist the energy transfer from the MgOmore » host to the Dy{sup 3+} ions. The Commission International De I-Eclairage chromaticity co-ordinates were calculated from emission spectra, the values (x,y) were very close to the National Television System Committee standard value of white emission. Therefore, the present phosphor was highly useful for display applications. - Graphical Abstract: PL emission spectra and CIE diagram of MgO:Dy{sup 3+} nanophosphor. - Highlights: • MgO:Dy{sup 3+} prepared by simple and low cost LCS method at low temperature (400 °C). • Characteristic emission peaks of Dy{sup 3+} ion at ∼ 483 and 573 nm are recorded. • CIE co-ordinate values located in the white region. • Present phosphor was quite useful for display applications.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [4] ;  [7]
  1. Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103 (India)
  2. (India)
  3. Department of Physics, C.M.R.T.U, RV College of Engineering, Bangalore 560 059 (India)
  4. Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091 (India)
  5. Chattisgarh Swamy Vivekananda Technological University, Bhilai, CG 493441 (India)
  6. Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054 (India)
  7. Department of Physics, B.M.S. Institute of Technology, Yelahanka, Bangalore 560 064 (India)
Publication Date:
OSTI Identifier:
22403582
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 97; 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; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONCENTRATION RATIO; DOPED MATERIALS; DYSPROSIUM IONS; EMISSION SPECTRA; EXCITATION; FOURIER TRANSFORMATION; GLYCINE; INFRARED SPECTRA; LIGHT EMITTING DIODES; MAGNESIUM OXIDES; PHOSPHORS; PHOTOLUMINESCENCE; POWDERS; SCANNING ELECTRON MICROSCOPY; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; VACANCIES; X-RAY DIFFRACTION