Synthesis and photoluminescence study on europium ion activated titania nanoparticle

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

Copyright © IAAM-VBRI Press

E-mail: tgdevi26@gmail.com

Abstract

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 750^oC 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 ⁵D_J (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. 

Keywords

Titania, nanoparticle, photoluminescence, lifetime, judd-ofelt.