Dhananjaya, N. and Nagabhushana, H. and Nagabhushana, B. M. and Rudraswamy, B. and Shivakumara, C. and Ramesh, K. P. and Chakradhar, R P S (2011) Thermo and photoluminescence properties of Eu(3+) activated hexagonal, monoclinic and cubic gadolinium oxide nanorods. Physica B-Condensed Matter, 406 (9). pp. 1645-1652. ISSN 0921-4526

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Abstract

Different phases of Eu(3+) activated gadolinium oxide (Gd (OH)(3), GdOOH and Gd(2)O(3)) nanorods have been prepared by the hydrothermal method with and without cityl trimethyl ammonium bromide (GAB) surfactant. Cubic Gd(2)O(3):Eu (8 mol%) red phosphor has been prepared by the dehydration of corresponding hydroxide Gd(OH)(3):Eu after calcinations at 350 and 600 degrees C for 3 h, respectively. When Eu(3+) ions were introduced into Gd(OH)(3), lattice sites which replace the original Gd(3+) ions, a strong red emission centered at 613 nm has been observed upon UV illumination, due to the intrinsic Eu(3+) transition between (5)D(0) and (7)F configurations. Thermoluminescence glow curves of Gd (OH)(3): Eu and Gd(2)O(3):Eu phosphors have been recorded by irradiating with gamma source ((60)CO) in the dose range 10-60 Gy at a heating rate of 6.7 degrees C sec(-1). Well resolved glow peaks in the range 42-45, 67-76,95-103 and 102-125 degrees C were observed. When gamma-irradiation dose increased to 40 Gy, the glow peaks were reduced and with increase in gamma-dose (50 and 60 Gy) results the shift in first two glow peak temperatures at about 20 degrees C and a new shouldered peak at 86 degrees C was observed. It is observed that there is a shift in glow peak temperatures and variation in intensity, which is mainly attributed to different phases of gadolinium oxide. The trapping parameters namely activation energy (E), order of kinetics (b) and frequency factor were calculated using peak shape and the results are discussed.

Item Type:	Article
Uncontrolled Keywords:	Nanorods; Gadolinium oxide; UV-vis; Photoluminescence; Thermoluminescence
Subjects:	Physical Properties
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Jan 2012 12:07
Last Modified:	02 Mar 2012 10:55
URI:	http://cgcri.csircentral.net/id/eprint/212

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