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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

UFS agreement on staff salary adjustment of 7.5%
2011-11-10

 
At this year's salary negotiations were from the left, front: Mr Lourens Geyer, Director: Human Resources; Ms Ronel van der Walt, Manager: Labour Relations; Ms Tobeka Mehlomakulu, Vice Chairperson: NEHAWU; Prof. Johan Grobbelaar, convener of the salary negotiations; back: Mr Ruben Gouws, Vice Chairperson of UVPERSU, Ms Esta Knoetze, Vice Chairperson of UVPERSU, Mr David Mocwana, fultime shopsteward for NEHAWU; Mr Daniel Sepeame, Chairperson of NEHAWU, Prof. Nicky Morgan, Vice-Rector: Operations; Prof. Jonathan Jansen, Vice-Chancellor and Rector of the UFS; Ms Mamokete Ratsoane, Deputy Director: Human Resources and Ms Anita Lombard, Chief Executive Officer: UVPERSU.
Photo: Leonie Bolleurs


Salary adjustment of 7,5%

The University of the Free State’s (UFS) management and trade unions have agreed on a general salary adjustment of 7,5% for 2012.
 
The negotiating parties agreed that adjustments could vary proportionally from a minimum of 7,3% to a maximum of 8,5%, depending on the government subsidy and the model forecasts.
 
The service benefits of staff will be adjusted to 9,82% for 2012. This is according to the estimated government subsidy that will be received in 2012.
 

UVPERSU and NEHAWU sign
 
The agreement was signed (today) Tuesday 8 November 2011 by representatives of the university’s senior leadership and the trade unions UVPERSU and NEHAWU.
 

R2 500 bonus
 
An additional once-off, non-pensionable bonus of R2 500 will also be paid to staff with their December 2011 salary payment. The bonus will be paid to all staff members who were in the employment of the university on UFS conditions of service on 31 December 2011 and who assumed duties before 1 October 2011. The bonus is payable in recognition of the role played by staff during the year to promote the UFS as a university of excellence and as confirmation of the role and effectiveness of the remuneration model.
 
It is the intention to pass the maximum benefit possible on to staff without exceeding the limits of financial sustainability of the institution. For this reason, the negotiating parties reaffirmed their commitment to the Multiple-year, Income-related Remuneration Improvement Model used as a framework for negotiations. The model and its applications are unique and have as a point of departure that the UFS must be and remains financially sustainable. 
 
 
Capacity building and structural adjustments
 
Agreement was reached that 1,54% will be allocated for growth in capacity building to ensure that provision is made for the growth of the UFS over the last few years. A further 0,78% will be allocated to structural adjustments.
 
Agreement about additional matters such as funeral loans was also reached.
 
“The Mutual Forum is particularly pleased that a general salary adjustment of 7,5 % could be negotiated for 2012. Taken into account the world financial downturn, marked cuts in university subsidies and the growth of the university, this is a remarkable achievement,” says Prof. Johan Grobbelaar, Chairperson of the Mutual Negotiation Forum. 
 

Increase for Professors, Deputy and Assistant Directors
 
According to Prof. Grobbelaar the Mutual Forum is also pleased that Professors and Deputy and Assistant Directors will benefit from the structural adjustments. These increases will align the positions with the median of the higher education market. The 1,54% allocated for growth will ensure that appointments can be made where the needs are the highest. The special year-end bonus of R2 500 is an early Christmas gift and implies that the employees in lower salary categories receive an effective increase of almost 9,5 %.
 
“The UFS is in a unique position when it comes to salary negotiations, because the funding model developed more than a decade ago, has stood the test of time and ensured that the staff receive the maximum possible benefits. Of particular note is the fact that the two majority unions (UVPERSU and NEHAWU) work together. The mutual trust between the unions and management is an example of how large organisations can function to reach specific goals and staff harmony,” says Prof. Grobbelaar. 

The implementation date for the salary adjustment is 1 January 2012. The adjustment will be calculated on the total remuneration package.

 

 

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