Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
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

UFS Safety Awareness March set to create a safe space for students
2017-07-27

 Description: Suspicious behavior Tags: safety, campaign, SRC, communication, awareness


The University of the Free State (UFS), in collaboration with various stakeholders, has dedicated the week of 24 to 28 July 2017 to creating awareness for the safety of students on and around its campuses.

UFS and CUT unite for safety
The highlight of the week will be on Thursday 27 July 2017 when a safety awareness march will take place from the Main Building on the Bloemfontein Campus to the Bram Fischer Building, where a memorandum will be handed over to Mr Sam Mashinini, MEC for Police, Roads, and Transport in the Free State. The march is a partnership between the UFS Student Representative Council (SRC) and the Central University of Technology (CUT).

 During a meeting on 24 July 2017, the Executive Committee of Senate granted formal approval for students and staff of the Bloemfontein Campus to take part in the safety march on 27 July 2017. For this reason, all lectures will be suspended from 11:00 to 13:00 on 27 July 2017 in order to give the campus community the opportunity to participate in the march. Academic staff, as well as staff in the administrative support services, are encouraged to join the march.

Programme for the safety march:


11:00: Marchers gather in front of the Main Building

11:15: Marchers depart from the Main Building to the Main Gate

11:30: Marchers exit the Main Gate and move towards the Central University of Technology (CUT). Students and staff who are unable to participate in the rest of the march, return to their work places or classes.

12:20: UFS and CUT marchers will gather at the Bram Fischer Building, situated on the corner of Nelson Mandela Avenue and Markgraaff Street. Here, the Rector and Vice-Chancellor of the UFS, Prof Francis Petersen, and the Vice-Chancellor and Principal of CUT, Prof Henk de Jager, will address the marchers, after which the memorandum will be read by the respective SRC Presidents and handed to Mr Mashinini.

Activities underway to raise safety awareness
During the week, the Student Representative Council (SRC), together with other stakeholders, have been involved in several activities on and off the Bloemfontein Campus, including door-to-door visits to student homes and residences on and around campus, awareness campaigns at all the gates of the campus, and a Safety Dialogue that will be held on Wednesday 26 July 2017 at the Equitas Auditorium. The aim of the Safety Week is to focus on informing, educating, and encouraging students as well as the Mangaung community at large, in order to work together in creating a safe environment for students.

The week started with the roll-out of an awareness campaign titled Reach Out, which is set to bring students and the community of Mangaung together to help decrease the number of violent crimes faced by students off campus. The communication plan includes safety messages, using outdoor billboards, posters on lampposts around the residential student areas, local community radio stations, campus media, and the university’s social media platforms.

A similar student safety awareness campaign will take place on the university’s Qwaqwa Campus during the week of 31 July 2017.



We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept