Thermoluminescence response in gamma and UV irradiated Dy2O3 nanophosphor

Chandrasekhar, M and Sunitha, DV and Dhananjaya, N and Nagabhushana, H and Sharma, SC and Nagabhushana, BM and Shivakumara, C and Chakradhar, RPS (2012) Thermoluminescence response in gamma and UV irradiated Dy2O3 nanophosphor. In: JOURNAL OF LUMINESCENCE, 132 (7). pp. 1798-1806.

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Abstract

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 degrees C for 1-4 kGy gamma irradiations. When dose is increased to 5 kGy, two more shouldered peaks were observed at 245 and 310 degrees C. However, in TL of ODH used samples, a single glow peak at 376 degrees 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 degrees 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. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF LUMINESCENCE
Publisher:	Elsevier
Additional Information:	Copyright for this article belongs to Elsevier
Keywords:	Nanophosphor;PXRD;TEM;Thermoluminescence;Irradiation;Trap parameters
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	22 Aug 2012 10:56
Last Modified:	22 Aug 2012 10:56
URI:	http://eprints.iisc.ac.in/id/eprint/44427

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