Abstract
Europium-doped yttrium oxide thin films have been deposited by a spray pyrolysis method. The crystallite sizes are calculated to be ~50nm using Scherrer׳s formula. Fourier transformed infrared spectroscopy (FTIR) reveals broad absorption with peak at 875cm−1. Surface morphology and elemental composition of the thin films are studied by a field-emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray spectroscopy (EDS). The energy gap (Eg) of the thin film sample is found to be ~5.37eV. The film exhibits photoluminescence (PL) emission over 525–550nm, 585–601nm, 612nm and 620–632nm under the excitation of 240nm. Gamma (γ)-irradiated films exhibit two well-resolved thermoluminescent (TL) glows with peaks at 460 and 570K. The TL glow curves are analyzed by a glow curve shape method. The activation energy and the frequency factor are found to be, respectively, ~0.6eV, ~3×106s−1 for 460K and ~0.53eV, ~46.72×103s−1 for 570K.
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