Journal
JOURNAL OF FLUORESCENCE
Volume 23, Issue 3, Pages 439-450Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-013-1160-7
Keywords
Nanophosphor; XRD; Bandgap; Photoluminescence; Energy transfer
Funding
- University Grants Commission, New Delhi, Government of India [37-200/2009 (SR)]
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This paper reports the structural and optical properties of rare earth doped and codoped yttrium oxide nanophosphors. Dysprosium (Dy3+) and Terbium (Tb3+) doped and codoped yttrium oxide (Y2O3) phosphors were prepared by combustion synthesis method and subsequently annealed to high temperature to eliminate the hydroxyl group (-OH) and to get more crystallinity. The formation of compounds was confirmed by the X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR). The diffuse reflectance spectra (DRS) of doped and codoped Y2O3 powder phosphors were measured and it is observed that the absorption edge of the doped samples is shifted towards blue region with respect to undoped sample. The bandgap of the prepared samples were evaluated with the help of Kubelka-Munk function using Diffuse Reflectance Spectra (DRS) and an increase in bandgap was observed with the decrease in crystallite size. A strong characteristics emission from Tb3+ and Dy3+ ions was identified and the influence of doping concentration and annealing temperature on photoluminescence properties was systematically studied. Transfer of energy was observed in dysprosium-terbium codoped Y2O3 nanophosphor at room temperature from Dy3+ ions toTb(3+) ions.
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