Speaker
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
PhD
Main supervisor (name and email)<br>and his / her institution
Name :Prof. O.M. Ntwaeaborwa
Email :ntwaeab@ufs.ac.za
Institution :University of the Free State
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
Yes
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>
Barium orthophosphate or Ba3(PO4)2 is known to be a good host for rare earth dopant ions to prepare light emitting materials or phosphors [1]. In this study Ba5(PO4)3OH was doped with europium (Eu3+), by using the combustion method, resulting in a phosphor material that emitted red light when excited with ultraviolet radiation. The following characterization techniques: X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, and photoluminescence (PL) spectroscopy were used to determine the structure, morphology, chemical composition and luminescent properties of the Ba5(PO4)3OH:Eu3+ phosphor powders with different concentrations of Eu3+. The XRD data exhibited characteristic diffraction patterns of the hexagonal phase of Ba5(PO4)3OH referenced in the standard JCPDS card number 00-001-0811, while the SEM results confirmed the formation of needle-like particles with diameter approximately equal to 100 nm. The red PL emission was attributed to transitions of the Eu3+ ions. The PL intensity of the Ba5(PO4)3OH:Eu3+ phosphors was shown to improve when the concentration of Eu3+ was increased from 0.1 to 3 mol% and the intensity was quenched for concentrations higher than 3 mol% due to the concentration quenching effects. This material was evaluated for possible applications in photodynamic therapy or PDT.
[1] M. Cheng, H. Junhui, Material Letters, 2012, 70, 101-104
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
