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01 March 2024 | Story Leonie Bolleurs | Photo SUPPLIED
Dr Lucas Erasmus
Dr Lucas Erasmus, Junior Researcher in the Department of Physics, has just returned from Belgium where he had his public defence of a joint PhD with Ghent University, titled: Luminescent solar concentrators – where Sm2+ doped phosphors shine.

“I like taking what I have learned from literature and going to the laboratory to test it. Sometimes the results surprise me, leading to additional experiments or refining. This process could continue for several months and even years, with me slowly building the puzzle. And finally, one day, all the pieces come together, and everything becomes very clear to me as a physicist. And if I am lucky, I will have the privilege of knowing a secret about nature that nobody else has known up to this point. However, as an innovator, I am tasked with using this new knowledge to develop ways to manipulate nature to deliver a helpful device.”

These are the thoughts of Dr Lucas Erasmus, Junior Researcher in the Department of Physics at the University of the Free State (UFS), who has just returned from Ghent, Belgium, where he had his public defence of a joint PhD with Ghent University, titled: Luminescent solar concentrators – where Sm2+ doped phosphors shine.

The research project is part of a bilateral collaboration between the Department of Physics at the UFS and the Department of Solid State Sciences at Ghent University. In this study, the strengths, experience, and resources of both research groups – experienced in developing luminescent materials for various applications – are used to ensure a stronger final product. To meet the requirements stipulated in the cooperation agreement between the two institutions for the joint supervision and certification of Dr Erasmus’ doctoral studies, research was conducted both at the UFS and at Ghent University.

Dr Erasmus’ research is significant in the light of rising energy prices, energy scarcity, and the pursuit of a carbon-free society, where there are strong incentives to develop new and renewable energy sources.

Combining windows and solar cells increase their relevancy in many applications

He says that although solar panels play an essential role in renewable energy – since they provide a route to directly convert solar radiation into electricity – there are limitations to installing conventional panels, which are bulky, rigid, and opaque. He believes that combining windows and solar cells could increase their relevance in the built environment, agricultural sector, and modern consumer electronics.

Explaining about the luminescent solar concentrator (LSC) in his study, he states that it is a device used as a large-area solar radiation collector that converts and emits radiation. The emitted radiation is directed to photovoltaic cells located in the small side area of the device. According to him, a basic LSC consists of a transparent waveguide with an embedded luminescent material and a strategically placed photovoltaic cell on the edge.

Dr Erasmus continues, “The large area of the waveguide collects a portion of the solar radiation, while the luminescent material absorbs the energy and downshifts it to longer wavelengths. Internal reflection directs the emitted photons towards smaller areas on the sides where the photovoltaic cells are used to convert the concentrated light into electricity.”

In his view, creating a large and efficient LSC is a challenging endeavour that requires an in-depth study of multiple domains. “This includes developing and optimising the luminescent material, studying its behaviour and the characteristics of the waveguide, and finally adding these two components and developing, characterising, and simulating the hybrid device,” he remarks.

“While the current prototype we have developed delivers good results, it is still far from perfect and not commercially viable,” he says, stating that this study could, however, serve as a guide for future researchers interested in developing LCSs. Dr Erasmus believes the underlying science behind the results contributes to a general understanding of the materials, making this study valuable to other fields and contributing to the larger body of science. At the end of the study, he also makes some recommendations for future research in this field. 

Study a reflection of theoretical knowledge and a practical system

The public defence consisted of both an internal and an external defence. The internal defence took place in January at the UFS between Dr Erasmus and the examination committee. The external defence occurred at Ghent University and was also open to the broader public. Also present at this event in Belgium were colleagues from the UFS – Prof David Motaung, an examiner; Prof Koos Terblans, co-supervisor; and Prof Hendrik Swart, supervisor for the PhD thesis.

Dr Erasmus’ experience of the oral examination was that the examiners were primarily positive in their critique but also thorough in their questioning. According to him, some of their remarks pointed out that they were impressed with the meticulous planning, execution, and interpretation of the experimental results and that the researchers involved ensured that any parameter that might have influenced the device was maximised. “Moreover, they liked the fact that I went all the way from theoretical knowledge to a practical system. The examiners also noted that the study compares well with the current state-of-the-art research in the field,” adds Dr Erasmus.

He says that having the public defence in Belgium was a once-in-a-lifetime experience, allowing him to interact and deliberate directly with the examiners and communicate their findings and conclusions to the broader public. Dr Erasmus hopes that this will lead to stronger collaboration and better public sentiment toward spending funding for scientific projects.

For future steps, he states, the research group involved in the project plans to continue this research by further increasing the device's efficiency. “To this end, we have already developed another luminescent material that can address some of the challenges we encountered while developing the first prototype device. This forms part of the work that Johané Odendaal is doing in her master’s degree, of which I am a co-supervisor. We also plan to enlarge the scope of our research to consider the challenges that are currently hampering the next generation of photovoltaic cells and to find ways in which we could address these issues,” comments Dr Erasmus.

News Archive

Relief for baby and child care at the UFS with donation from Fuchs Foundation
2007-11-17

 

At the launch of the Beds of Hope campaign were, from the left: Dr Riaan Els, Chief Executive Officer of the Carl en Emily Fuchs Foundation, Prof. André Venter (Head of the Department of Paediatrics and Child Care), Ms Corné Booyens (National Grants Manager at the Carl en Emily Fuchs Foundation), Dr Nick van Zyl (Clinical Head at Universitas Hospital), and Prof. Niel Viljoen (Chief Director: Operations).
Photo: Leonie Bolleurs

Relief for baby and child care at the UFS with donation from Fuchs Foundation

The Department of Paediatrics and Child Health at the University of the Free State (UFS) has received relief for their need of specialised healthcare for babies and children with a donation of R1,5 million from the Carl and Emily Fuchs Foundation.

As a result of this, the Beds of Hope campaign was launched today on the Main Campus in Bloemfontein. With the campaign, the department wants to address the serious need for specialised healthcare for babies and children in the central regions of South Africa.

The department is one of four out of 19 children hospitals in South Africa to receive such a donation. .

“We take care of babies and children in the Universitas and Pelonomi Hospitals in Bloemfontein who have a serious need for specialised healthcare. We are, however, the only supplier of this kind of care in the Free State, North West, Eastern Cape and Lesotho and are responsible for the specialised healthcare of more than 100 000 children. Many of our equipment are outdated and must be urgently repaired or replaced,” said Prof. André Venter, Head of the Department of Paediatrics and Child Care at the UFS.

“Because we are concerned about our patients, the department launched the Beds of Hope campaign with the help of the donation we received from the Fuchs Foundation. With the campaign, we aim to raise some R15 million in the space of two years to purchase beds and specialised equipment for the intensive care and high care units for both hospitals,” said Prof. Venter.
According to Prof. Venter, this includes babies and children with needs for specialised healthcare in the fields of intensive care, oncology, cardiology, neurology, endocrinology, gastro-enterology, neonatology and infectious diseases.

“About ten children are currently not receiving the care they need due to the lack of beds in the intensive care unit. Much more neonates can annually receive critical care if we can supply adequate facilities,” said Prof. Venter.

The other hospitals that are also supported by the Fuchs Foundation’s donation are: Healing Jozi Kids, Boikanyo Foundation and the Groote Schuur Hospital’s neonatal department.

The donation is the beginning of the first phase of the national Fuchs Healing Kids Project, which aims to improve the quality of paediatric care in South Africa.

The aim of this phase is to assist the hospitals to develop the systems and skills needed to collect more money. The research part of phase two and the building up of the hospitals’ children trust funds to be self self-supporting, will happen simultaneously. This phase will be launched early in 2008.

Media Release
Issued by: Lacea Loader
Assistant Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za  
16 November 2007
 

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