Thermoluminescence response in gamma and UV irradiated Dy₂O₃ nanophosphor

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• 作者：M. Chandrasekhar^a ; ^b ; D.V. Sunitha^a ; N. Dhananjaya^c ; H. Nagabhushana^a ; ^{bhushanvlc@gmail.com} ; S.C. Sharma^a ; B.M. Nagabhushana^d ; C. Shivakumara^e ; R.P.S. Chakradhar^f ; ^{sreechakra72@yahoo.com}
• 关键词：Nanophosphor ; PXRD ; TEM ; Thermoluminescence ; Irradiation ; Trap parameters
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：July, 2012
• 卷：132
• 期：7
• 页码：1798-1806
• 文件大小：1158 K

摘要

Low temperature solution combustion method was employed to synthesize Dy₂O₃ nanophosphors using two different fuels (sugar and oxalyl dihydrazine (ODH)). Powder X-ray diffraction confirm pure cubic phase and the estimated particle size from Scherrer's method in sugar and ODH fuel was found to be 26 and 78 nm, respectively, and are in close agreement with those obtained using TEM and W-H plot analysis. SEM micrographs reveal porous, irregular shaped particles with large agglomeration in both the fuels. An optical band gap of 5.24 eV and 5.46 eV was observed for Dy₂O₃ for sugar and ODH fuels, respectively. The blueshift observed in sugar fuel is attributed to the particles size effect. Thermoluminescence (TL) response of cubic Dy₂O₃ nanophosphors prepared by both fuels was examined using gamma and UV radiations. The thermoluminescence of sugar used samples shows a single glow peak at 377 掳C for 1-4 kGy gamma irradiations. When dose is increased to 5 kGy, two more shouldered peaks were observed at 245 and 310 掳C. However, in TL of ODH used samples, a single glow peak at 376 掳C was observed. It is observed that TL intensity is found to be more in sugar used samples. In UV irradiated samples a single glow peak at 365 掳C was recorded in both the fuels with a little variation in TL intensity. The trapping parameters were estimated by different methods and the results are discussed.