4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

Synthesize and characterisation of optical properties of a down-converting Y<sub>2</sub>O<sub>3</sub> phosphor co-doped with Bi<sup>3+</sup> and Yb<sup>3+</sup>.

5 Jul 2016, 16:10
1h 50m
Kramer Law building

Kramer Law building

UCT Middle Campus Cape Town
Board: A.033
Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster Session (1)

Speaker

Mr Edward Lee (University of the Free State)

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

Yes

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

Msc

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

HC Swart
SwartHC@ufs.ac.za
University of the Free State

Abstract content <br> &nbsp; (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>

For silicon (Si) solar cells, phosphor materials are necessary for the conversion of ultraviolet (UV) to near-infrared (NIR) radiation. The emission of more than one NIR photon for each UV photon absorbed was demonstrated using a down-converting Y2O3 phosphor co-doped with Bi3+ and Yb3+. Synthesis of Bi3+ and Yb3+ co-doped Y2O3 phosphor was accomplished by using the co-precipitation method with varying the pH levels of the obtained solution. The influence of pH on the crystal structure, luminescent properties and the size and morphology of the particles were investigated using x-ray diffraction, photoluminescence and scanning electron microscopy. Strong NIR emission was observed at around 1 m. The strong NIR emission at around 1 m, under UV excitation, was due to the 2F5/2 to 2F7/2 transition of Yb3+ as a result of energy transfer from Bi3+ to Yb3+ ions. An energy transfer mechanism was proposed and will be presented. This phosphor proves to be promising for enhancing the efficiency of c-Si solar cells.

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

Yes

Primary author

Mr Edward Lee (University of the Free State)

Co-authors

Prof. Hendrik Swart (University of the Free State) Prof. JJ (Koos) Terblans (UFS)

Presentation Materials

Peer reviewing

Paper