Speaker
Level for award<br> (Hons, MSc, <br> PhD)?
PhD
Apply to be<br> consider for a student <br> award (Yes / No)?
Yes
Abstract content <br> (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 5D3→7FJ(J=0-6) and 5D4→7FJ(J=0-6) transitions of Tb3+ while the red emission was attributed to 5D0→7FJ(J=0-4) transitions of Eu3+.
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Main supervisor (name and email)<br>and his / her institution
Prof. Martin Ntwaeaborwa
ntwaeab@ufs.ac.za
Department of Physics at University of The Free State
