4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Synthesize and characterisation of optical properties of a down-converting Y2O3 phosphor co-doped with Bi3+ and Yb3+.

Presented by Mr. Edward LEE on 5 Jul 2016 from 16:10 to 18:00
Type: Poster Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.033

Abstract

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 Y<sub>2</sub>O<sub>3</sub> phosphor co-doped with Bi<sup>3+</sup> and Yb<sup>3+</sup>. Synthesis of Bi<sup>3+</sup> and Yb<sup>3+</sup> co-doped Y<sub>2</sub>O<sub>3</sub> 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 Yb<sup>3+</sup> as a result of energy transfer from Bi<sup>3+</sup> to Yb<sup>3+</sup> 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.

Award

Yes

Level

Msc

Supervisor

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

Paper

Yes

Permission

Yes

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room:


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