1Department of Physics, North-Eastern Regional Institute of Science and Technology, Nirjuli 791109, Arunachal Pradesh, India
2Department of Physics, Manipur University, Imphal 79 003, Manipur, India
Adv. Mater. Lett., 2017, 8 (4), pp 557-564
DOI: 10.5185/amlett.2017.1432
Publication Date (Web): Mar 15, 2017
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E-mail: tgdevi26@gmail.com
Eu3+ doped TiO2 (0.2-1at. %) is synthesized successfully by non-aqueous sol-gel technique at low temperature. They are characterized structurally and optically with the used of X-ray diffraction (XRD), UV-visible spectrophotometer, Photoluminescence (PL), microscopy (SEM) and Transmission electron microscopy (TEM). The anatine toretile phase transition is observed at 750oC and lattice distortion ratios are reduced whereas crystallites sizes are found to increase with increases of temperature. The emission spectrum under excitation at the 7F0→5L6 (393nm) transition of the Eu3+ ion shows broad emission bands arising from the 5DJ (J=0, 1) levels and with the emission decays lifetime varying between 0.243 and 0.375ms for samples prepared at different temperatures. The Judd-Ofelt intensity parameters W2 are found in the range 6.57 - 17.14 x10-20cm2 at different concentrations and temperatures. Quantum yield of all the samples are more than 80% at different temperature. The average decay lifetime decreases with the increase of Eu3+ concentration.
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