Speaker
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>
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.
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
Msc
Main supervisor (name and email)<br>and his / her institution
HC Swart
SwartHC@ufs.ac.za
University of the Free State
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
