9-13 July 2012
Africa/Johannesburg timezone
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Synthesis and characterization of europium activated lanthanum oxysulphide by sol- combustion method

Presented by Mr. Ali Abdub Guyo ALI on 11 Jul 2012 from 10:55 to 11:15
Type: Oral Presentation
Session: DCMPM2
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Ali AG, Dejene BFa* and Swartb HC. aDepartment of Physics, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba, 9866, South Africa. bDepartment of Physics, University of the Free State, P.O. Box 339, B loemfontein, 9300, South Africa Sol-combustion synthesis was used to obtain nanocrystalline La2O2S:Eu red-emitting phosphors. X-ray diffraction (XRD) was employed to determine that the powders in the as-synthesized samples were crystalline. Upon increasing the La/S molar ratios, the crystallinity in the nanosized particles increased, which resulted in a higher photoluminescence emission intensity of these phosphors. Fourier-transform infrared spectrometry analysis showed that there is a negligible difference in the absorbed impurities with various molar ratios. Hence, it was concluded that the La/S molar ratio plays an important role in the luminescence intensity of these phosphors.

Award

Yes

Level

PhD

Supervisor

Dejene BF. dejenebf@qwa.ufs.ac.za University of the free state, Qwaqwa Campus.

Paper

yes

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