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 a narrowband Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH):Gd<sup>3+</sup>, Pr<sup>3+</sup> phosphor for medical applications

10 Jul 2012, 17:30
2h
IT Building

IT Building

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

Speaker

Ms PUSELETSO MOKOENA (UNIVERSITY OF THE FREE STATE)

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

M.Sc

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

Hydroxylapatite (Ca5(PO4)3(OH)) is a well-known bioceramic material for medical application because of its ability to form a chemical bond with bones. Due to the better osteoconductivity, synthetic hydroxylapatite is considered to be an ideal material as a bone substitute. In this study, we investigate the luminescent properties of (Ca5(PO4)3(OH)) co-doped with Gadolinium (Gd3+) and Praseodymium (Pr3+) synthesized using a wet chemistry method. The dried and calcined Ca5(PO4)3(OH):Gd3+, Pr3+ phosphor was characterized using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Photoluminescence (PL) spectroscopy. The XRD patterns showed a single hexagonal (Ca5(PO4)3(OH)) phase. The diffraction peaks became narrower with an increase in the calcination temperature from 700 ⁰C to 900 ⁰C indicating an increase in the degree of crystallininty. Photoluminescence excitation measurements showed that the phosphor can be efficiently excited by 221 nm UV light. The PL emission spectrum consisted of two narrow bands with a major emission at 316 nm and a minor emission at 630 nm, which correspond to radiative transitions in Gd3+ and Pr3+ respectively. The Ca5(PO4)3(OH):Gd3+, Pr3+ phosphor is evaluated for a possible application as a light source in phototherapy lamps.

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

Yes

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

OM Ntwaeaborwa
ntwaeab@ufs.ac.za
University of the Free state

Primary author

Ms PUSELETSO MOKOENA (UNIVERSITY OF THE FREE STATE)

Co-authors

Prof. HENDRIK SWART (UNIVERSITY OF THE FREE STATE) Prof. MARTIN NTWAEABORWA (UNIVERSITY OF THE FREE STATE)

Presentation Materials

Peer reviewing

Paper