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18 April 2022 | Story Leonie Bolleurs | Photo Stephen Collett
Prof Ted Kroon
Prof Ted Kroon from the Department of Physics recently delivered his inaugural lecture on the topic What’s the use of a rainbow on the UFS Bloemfontein Campus.

“A rainbow is a natural phenomenon, the result of the refraction and reflection of the sun’s rays in drops of rain. As far as mankind is concerned, it’s a perfectly useless object and won’t make anyone money. Yet the poet who said, My heart leaps up when I behold a rainbow in the sky, only put into word the feeling of wonder and excitement we all have when we see a rainbow.”

“Every day I see a rainbow in my work; I do not need to wait to see one in the sky,” says Prof Ted Kroon, Professor in the Department of Physics at the University of the Free State (UFS), who used this phenomenon to introduce the topic of his inaugural lecture: What’s the use of a rainbow. 

“Far from being only a colourful spectacle with no practical value, rainbows are useful – and lead to useful things,” he believes. 

According to Prof Kroon, one can find examples of real rainbows and rainbow analogies used not only in everyday life, but also in physics. “Besides it being familiar devices in literature, culture, and even marketing, studies of rainbows can yield practical engineering information and may even help us to find new habitable planets,” he says.

Inspired by the many uses of a rainbow

In his lecture, he discussed the basic features of natural rainbows and how they come about. He also explored how the rainbow gives meaning to colour, and how this relates to the temperature of objects. He looked at an array of instances where the rainbow is used; from depicting the life of a star to indicating that we are sick (a thermometer) or when we need to refill a gas cylinder.
Moreover, Prof Kroon pointed out that rainbows are used in computer chips, stress identification, and to transmit internet data through underwater cables of glass fibre. He also referred to how the rainbow was harnessed as an engineering tool to measure refractive index and characterise fine droplet sprays used in industry. 

He continues, “Remarkably, the science developed to understand the natural rainbow can be redirected and applied to the optical properties of metallic nanoparticles, allowing the development of nanotechnology. Knowing how the natural rainbow works and its limitations, better systems have been developed to produce rainbows. Such rainbows have been used to discover new elements and to determine the age of the universe.”

As a member of an international community of phosphor researchers who are privileged to work with rainbows every day, he has used them to study the light-emitting properties of materials doped with bismuth. With this project – an initiative with the African Laser Centre taking place between 2016 and 2021 – he collaborated with the University of Khartoum in Sudan and trained a number of its postgraduate students. “My role included the guidance of students and the measurement and interpretation of the light-emitting properties of the materials. Our research during this time, considering more than a dozen materials, was summarised in 34 scientific publications that contributed to a greater understanding of bismuth ions as light-emitting materials,” he explains. 

Developing new materials, efficient in emitting blue light

He has been developing luminescent materials since 2006, primarily for general lighting (fluorescent tubes and LEDs) and displays (television, computer, and cellphone screens), as well as niche applications in medical and forensic science. 

As part of his current research, he is examining the effect of plasmonic metal nanoparticles on phosphor light emission. He is also exploring materials that absorb infrared light but emit visible light. “For this, I would like to consider the long-term stability of such materials and develop new materials that are more efficient in emitting particularly blue light,” he says. 

Prof Kroon holds a C2 rating from the National Research Foundation and has published more than 150 articles and book chapters, obtaining a Scopus h-index of 26.

News Archive

Council on Higher Education LLB qualification review not yet complete
2017-05-16

The reaction from various stakeholders following the ‘Outcomes of the National Review of the LLB Qualification’ by the Council on Higher Education (CHE) on 12 April 2017 requires the CHE to clarify that the national review process has not been completed and is ongoing.

The peer-review process conducted under the auspices of the CHE is based on the LLB Standards Document which was developed in 2014-2015 with input from higher-education institutions and the organised legal profession. Following self-review and site visits by peers, the process is now at the point where commendations and shortcomings have been identified, and the statement of 12 April reflects those findings. All law faculties and schools have been asked to improve their LLB programmes to meet the LLB Standard, and no LLB programme has been de-accredited. All institutions retain the accreditation they had before the Review process began and all institutions are working towards retaining their accreditation and improving their LLB programmes.

The South African Law Deans’ Association (SALDA) has issued a set of responses regarding the LLB programme review. The following questions and answers were published to give more clarity on the questions raised.

1.    What is the effect of a finding of conditional accreditation?
The programme remains accredited.

(“Accreditation refers to a recognition status granted to a programme for a stipulated period of time after an HEQC evaluation indicates that it meets minimum standards of quality.”)

The institution must submit a progress report by 6 October 2017 that indicates how short-term aspects raised in the HEQC reports have been addressed and an improvement plan to indicate how longer-term aspects will be addressed.

2.    What is the effect of a finding of notice of withdrawal of accreditation?
The programme remains accredited.

The institution must submit an improvement plan by 6 October 2017 to indicate how the issues raised in the HEQC report will be addressed, including time frames.

3.    How does the finding of notice of withdrawal affect current students?
Students currently enrolled for the LLB programme at any institution are not affected at all. They will graduate with an accredited qualification.

4.    How does the finding of notice of withdrawal affect new applicants?
The programmes remain accredited and institutions may enrol new students as usual. This also includes students completing BA/BCom (Law) programmes who wish to continue with the LLB programme.

5.    How does the finding of notice of withdrawal affect prior graduates?
Degrees previously conferred are not affected.

6.    What happens when the improvement plans are submitted in October 2017?
The CHE will evaluate the plans when they are submitted, and the programmes remain accredited until a decision is taken whether the improvement plan is sufficient and has been fully given effect to or not. The institutions will have to submit progress reports to the CHE indicating implementation of measures contained in the improvement plan.

Should a decision at some stage be taken that a programme’s accreditation must be withdrawn, a teaching-out plan would be implemented so that all enrolled students would have the opportunity to graduate with an accredited degree.

For more information on the CHE’s pronouncement please contact Moleboheng Moshe-Bereng on MosheBerengMF@ufs.ac.za.

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