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>

A new white light emitting phosphor

12 Jul 2012, 17:30
IT Building

IT Building

Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster Session


Mr Samy Shaat (Department of Physics at University of The Free State)

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

The objective of this study was to prepare a new aluminates host for rare-earth ions and evaluate it for application in white lighting. CaAl2O4:Tb3+;Eu3+ nanocrystalline phosphors with good crystallinity were successfully synthesized by a combustion method using urea as fuel and metal nitrates as precursors at a relatively low temperature of 500oC. The XRD diffraction patterns showed single monoclinic phase of the CaAl2O4 as referenced to standard JCPDS data files No. 70-134. As confirmed from the scanning electron microscopy (SEM) images, the characteristic platelet-like particles of the combustion method were formed. The diffusion reflectance spectra where recorded from 800-200 nm by using a UV-Vis spectrometer. Photoluminescence (PL) spectroscopy, excitation and emission spectra of CaAl2O4:Tb3+;Eu3+ were also recorded. A simultaneous emission of blue, green and red PL was observed from CaAl2O4:Tb3+;Eu3+ phosphor that was excited at 230 nm. The blue and green emissions were respectively attributed to 5D37FJ(J=0-6) and 5D47FJ(J=0-6) transitions of Tb3+ while the red emission was attributed to 5D07FJ(J=0-4) transitions of Eu3+.

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

Prof. Martin Ntwaeaborwa
Department of Physics at University of The Free State

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Primary author

Mr Samy Shaat (Department of Physics at University of The Free State)


Prof. Hendrik Swart (Department of Physics at University of The Free State)

Presentation Materials

Peer reviewing