Effect of lithium incorporation on luminescence properties of nanostructured Y2O3:Sm3+ thin films

• Published in: Journal of analytical and applied pyrolysis 2017-01, Vol.123, p.229-236
• Main Authors: Jayaramaiah, J.R., Nagabhushana, K.R., Lakshminarasappa, B.N.
• Format: Article
• Language: English
• Subjects: Luminescence; Morphology; Optical properties; Yttrium oxide thin films
• ISSN: 0165-2370; 1873-250X
• DOI: 10.1016/j.jaap.2016.11.023

[Display omitted] •Li-Y2O3:Sm3+ thin films prepared by spray pyrolysis.•[222] planes are preferential orientation during crystal growth.•The FESEM shows particles are appear as fine solid grains in nature.•Photoluminescence exhibit emission peaks at 580, 595, 608, 622, 645 and 662nm.•Thermoluminescence centres are at 400K, 460K and 580K. Lithium ions incorporated samarium doped yttrium oxide nanostructured thin films are prepared by spray pyrolysis. Glancing angle X-ray diffraction spectrum reveals the phase and crystallinity of the film. The crystallites sizes are found to be ∼50nm. Surface morphology of the film is studied using field emission scanning electron microscope. The image appears as carved sculptures of particles with agglomeration. Fourier transformed infrared spectrum shows a sharp and wide absorption peak at 875cm−1. Optical absorption spectrum exhibits a prominent absorption peak at 270nm and the corresponding energy gap is found to be ∼5.53eV. A broad photoluminescence emission is observed in the range 560–690nm with a peaks at 595, 608 and 622nm and shoulders at 580, 645 and 662nm. The films are irradiated with γ-rays in a dose range 187–563Gy. Thermoluminescence glow curve is deconvoluted into three peaks with temperature maxima at 400, 460 and 580K. The activation energy and frequency factor of these TL glows are found to be in the order of ∼0.58eV and ∼106s−1 respectively.