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

• Published in: Materials characterization Vol. 97
• Main Authors: Devaraja, P.B., Department of Physics, C.M.R.T.U, RV College of Engineering, Bangalore 560 059, Department of Physics, Acharya Institute of graduate studies, Bangalore 560 090, Avadhani, D.N., Nagabhushana, H., Prashantha, S.C., Sharma, S.C., Nagabhushana, B.M., Nagaswarupa, H.P., Daruka Prasad, B.
• Format: Journal Article
• Language: English
• Published: United States 15-11-2014
• Subjects: CONCENTRATION RATIO; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DOPED MATERIALS; DYSPROSIUM IONS; EMISSION SPECTRA; EXCITATION; FOURIER TRANSFORMATION; GLYCINE; INFRARED SPECTRA; LIGHT EMITTING DIODES; MAGNESIUM OXIDES; MATERIALS SCIENCE; PHOSPHORS; PHOTOLUMINESCENCE; POWDERS; SCANNING ELECTRON MICROSCOPY; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; VACANCIES; X-RAY DIFFRACTION
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/J.MATCHAR.2014.08.008

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 MgO 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.