9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Synthesis and characterization of europium activated lanthanum oxysulphide by sol- combustion method

11 Jul 2012, 10:55
Oral Presentation Track A - Division for Condensed Matter Physics and Materials DCMPM2


Mr Ali Abdub Guyo Ali (University of the free State, Qwaqwa campus.)

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Main supervisor (name and email)<br>and his / her institution

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

Abstract content <br> &nbsp; (Max 300 words)

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.

Primary author

Mr Ali Abdub Guyo Ali (University of the free State, Qwaqwa campus.)


Prof. Francis Dejene (University of the Free State)

Presentation Materials

Peer reviewing