8-12 July 2013
Africa/Johannesburg timezone
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Thermoluminescence study of beta -irradiated SrAl2O4:Eu2+,Dy3+ phosphors.

Presented by Mr. ALI WAKO on 9 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Session: Poster1
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

The Eu2+ doped and Dy3+ co doped strontium aluminate (SrAl2O4:Eu2+,Dy3+) phosphors were synthesized by solution - combustion synthesis technique using urea as a reducer at initiating temperature of 500oC, a widely known method for preparing nano sized phosphors. Sr(NO3)2, Al(NO3)3.9H2O, CH4N2O, Eu(NO3)3.5H2O and Dy(NO3)3 are used as the raw materials for the preparation of SrAl2O4 (RE: Eu, Dy) precursor. The thermoluminescence (TL) properties of beta irradiated Eu2+ doped and Dy3+ co doped strontium aluminate (SrAl2O4:Eu2+,Dy3+) have been studied. The optical properties in terms of TL glow curves are discussed in detail. The TL intensity was recorded for different beta doses and heating rates as a function of temperature. The influence of repeated measurements on peak temperature and TL intensity was also recorded. The different parameters like activation energy (E), frequency factor (S) and shape factor are calculated using TL glow curves. We have also calculated the trap depth by different methods including initial rise, variable heating and peak shape methods. The dependence of the peak position on the Tm-Tstop confirmed first order kinetics of the obtained glow curves.

Award

YES

Level

PhD

Supervisor

DEJENE F.B.

Paper

YES