9-13 July 2012
Africa/Johannesburg timezone
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Thermoluminescent properties of Ba1-xMgxAl2O4:Eu2+,Dy3+ prepared by combustion method

Presented by Dr. Bakang Moses MOTHUDI on 12 Jul 2012 from 11:20 to 11:40
Type: Oral Presentation
Session: DCMPM1
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Ba<sub>1-x</sub>Mg<sub>x</sub>Al<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphors prepared by combustion method at an initiating combustion temperature of 600 &deg;C. The X-ray diffraction patterns of different compositions of the as-prepared were observed and the intensity of the peaks improved significantly after annealing the samples in air for 3 hours at 1000 &deg;C. The SEM images of the samples with compositions x = 0.0 and 1.0 show the spherical nanoparticles of almost pure BaAl<sub>2</sub>O<sub>4</sub> and MgAl<sub>2</sub>O<sub>4</sub> respectively. The broad emission spectra shown by most of the samples can be attributed to the typical 4f65d1 -4f7 transition of the Eu<sup>2+</sup> ions. The variable peak positions shown in most of the phosphors can be attributed to different composition of Mg (x= 0.0 - 1.0).

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