Speaker
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 O.M Ntwaeaborwa
ntwaeb@ufs.ac.za
University of the Free State
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
No
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
Dysprosium and terbium doped lanthanum phosphovanadate (LaV0.25P0.75O4: Dy3+ and Tb3+) phosphor powders were synthesized by the solution combustion method. X-ray diffraction (XRD) was used investigate phase formation of the prepared phosphor powder. Scanning electron microscopy (SEM) images revealed that the prepared powder consisted of different shapes and sizes. Elemental composition was examined by energy dispersive x-ray spectroscopy (EDS), while the stretching mode frequencies were determined by Fourier transform infrared spectroscopy (FTIR). The band gap was estimated from the diffuse reflectance spectra. The excitation spectra of both dysprosium and terbium doped samples showed a strong broad band extending from 200 to 350 nm with the maximum at λ ≈ 274 nm. Photoluminescence emission spectra for dysprosium doped samples showed two peaks at 480 nm (4 F9/2 —6 H13/2) and 573 nm (4 F9/2 —6 H15/2) corresponding to Dy3+ emission while four emission peaks were observed for terbium doped samples at 490 nm (5 D2 — 7 F5), 544 nm (5 D2 — 7 F5), 586 nm (5 D2 — 7 F2) and 623nm (5 D2 — 7 F5) corresponding to transitions of Tb3+ ions. These photoluminescence results further revealed that the PL intensity increases with an increase in temperature.
Apply to be<br> considered for a student <br> award (Yes / No)?
No
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
N/A
