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Blue light emitting Y2O3:Tm3+ nanophosphors with tunable morphology obtained by bio-surfactant assisted sonochemical
K N Venkatachalaiah1, H Nagabhushana2, G P Darshan3
1Department of Physics, Amrita School of Engineering, Amrita Vishwavidyapeetham, Amrita University, Bengaluru 560035, India; Research and Development Center, Bharathiar University, Coimbatore 641046, India.
Abstract:
Modified sonochemical route was used to prepare Y2O3:Tm3+ (1-11mol%) nanophosphor using Mimosa pudica (M.P.) leaves extract as bio-surfactant. The prepared samples were exhibited high crystalline nature with various morphologies. This was due to sonochemical experimental reaction took place between cavitation bubbles and nearby solution. The average crystallite sizes of the prepared samples were about 15nm to 21nm as obtained from PXRD and TEM analysis. The ultraviolet visible absorption spectra showed prominent bands with an energy gap varied from 5.73eV to 5.84eV. Photoluminescence (PL) emission spectra shows the prominent blue light emission peak at ~456nm attributed to 1D2→3F4 transitions of Tm3+ ions. Judd-Ofelt intensity parameters were estimated by using PL emission spectra. The photometric characteristics of the prepared compounds were very close to the blue color of NTSC standards. So the results were fruitful in making use of Y2O3:Tm3+ nanophosphor as an alternative material for effective blue component in WLED's.
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