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Prof Hendrik Swart played a key role in the Department of Physics acquiring the PHI Quantes XPS system, the first in Africa and one of only 20 in the world.

The state-of-the-art equipment in the Department of Physics at the University of the Free State (UFS) differentiates this department from its competitors. Availability of the equipment makes it possible for researchers as well as students to deliver work that receives national and international recognition. 

Recently, the department acquired a PHI Quantes XPS system, the first in Africa and one of only 20 in the world. 

Creating better phosphor 

“The Quantes XPS system uses X-rays to determine the chemical composition of molecules on the surface of a sample. The system is unique in the sense that it also has an extra X-ray source that can determine the chemical state below the surface, which was not possible in the past.  This will help us to dictate the position of defects in our phosphor materials that will consequently enable us to create better phosphor for solid state lighting as well as solar cell applications,” explains Prof Hendrik Swart, Senior Professor in the Department of Physics, who also holds the SARChI Chair in Solid State Luminescent and Advanced Materials.

After he had the opportunity to observe the system in the factory in Chigasaki, Kanagawa, Japan, where he attended a conference, Prof Swart was very impressed by its performance. He discussed it with Prof Koos Terblans, Head of the department, and other colleagues, and started making plans to buy the system. 

When the department first bought the X-ray photoelectron spectroscopy (XPS) system in 2007/2008, it became the national facility on XPS measurements. Not only is this an upgrade of the XPS system bought 14 years ago, but the new system will enable the department to do more measurements. “The number of samples that we have to handle has just become too much for one system. The new system’s increased capacity for making measurements addresses this challenge and it also gives UFS scientists and postgraduate students more time to spend on fundamental measurements to develop research of a higher level,” says Prof Swart.

(The Quantes XPS system. Photo:Supplied)

Explaining about the measurements, Prof Swart says: “This advanced X-ray photoelectron spectroscopy (XPS) instrument has the capability to analyse the very small area that the user is interested in and a large area of the uniform sample surface. The two different types of X-ray sources – the hard X-ray source and the more conventional soft X-ray source – can be switched automatically, allowing users to analyse the same area and/or points of a sample. The PHI Quantes XPS system ensures the availability of superior features such as automatic analysis, automatic sample transfer, turnkey charge neutralisation, and advanced data processing.”

“This XPS instrument is designed to pioneer new methods and applications transcending conventional ideas of what is possible.”

Optimising efficiency of materials

Prof Swart says the Department of Physics, especially the Research Chair in Advanced and Luminescent Materials, is developing new high-technology materials on a daily basis. “It is very important to know the chemical composition and defect distribution of the materials in order to add value to the fabrication of these materials,” he adds.

“The distribution of these defects is vital for the efficiency of the phosphor materials. If we know where these defects are located, we can determine the mechanisms of the light output coming from these phosphors,” describes Prof Swart.

Research conducted as part of the Research Chair in Solid State Luminescent and Advanced Materials will benefit significantly from this new system.

(Prof Koos Terblans, Head of the Department of Physics next to the Quantes XPS system. Photo:Supplied) 

“We are currently concentrating on phosphors as sensors (temperature), light-emitting diodes (LEDs), and solar cells, where we optimise the efficiency and durability of these materials. Any new knowledge, which I believe the PHI Quantes XPS system will provide us, will help us to reach our goal much quicker,” he says. 

Apart from the positive impact on research, the PHI Quantes XPS system will also be a benefit to society in the long term. Improved LEDs can be used to save electricity, and better solar cells can help to generate electricity, to mention but two examples. 

News Archive

UFS will increase its volume of quality research
2009-11-25

 
From the left are, seated: Prof. Alice Pell, Vice-Provost: International Relations at Cornell University in the USA and Prof. Jonathan Jansen, Rector and Vice-Chancellor of the UFS; standing: Prof. Ezekiel Moraka, Vice-Rector: External Relations at the UFS, and Prof. David Wolfe from Cornell University during the signing of a memorandum of agreement between the two institutions.
Photo: Stephen Collett

The University of the Free State (UFS) is taking its research serious and is therefore going to increase its volume of quality research. This includes the production of quality scholarly books in the humanities and social sciences.

This was said by Prof. Jonathan Jansen, Rector and Vice-Chancellor, at the launch of the Strategic Academic Cluster initiative of the University on the Main Campus in Bloemfontein last night.

“We are going to produce the kind of research that is associated with scholarships. New models of training, new standards of performance and the introduction of an accelerated Vice-Chancellor’s Prestige Scholars’ Programme are among the initiatives that will be introduced. These are all aimed at boosting our university’s research performance,” said Prof. Jansen.

Another strategy to boost research performance at the UFS is the search for 25 leading professors to be appointed across the disciplines, but especially in the social sciences, education and the humanities. These positions have already been advertised and will be phased in with the goal of achieving equity and excellence in the academic and research profile of the UFS. “We’ve had an overwhelming response to the advertisements from local academics as well as those abroad,” said Prof. Jansen.

Each of the six Cluster Directors gave a short presentation of its aim and focus areas during last night’s dinner. These Clusters will in future direct the University’s research endeavours. It represents a move from a fragmented to a more focused approach to research development at the UFS.

The UFS also signed a memorandum of agreement with Cornell University (USA) last night. The guest speaker, Prof. Alice Pell, Vice-Provost: International Relations at Cornell University and member of the UFS’s International Advisory Board, said that, just as the cluster research teams need representatives from different disciplines, universities need diverse partners to recognise their potential fully. Collaborating with partners with ‘fresh eyes’ that have different cultural perspectives, access to different technologies and partners with different priorities can have important implications in the research and education provided by the UFS and Cornell,” she said.

“The interdisciplinary approach adopted by the UFS in developing the Strategic Academic Clusters seems likely to provide students with the intellectual frameworks and research tools that they need to address the problems in society,” she said.

“The most important issues facing the USA and South Africa are similar, namely how to effect the social transformation that will provide equal opportunities to all of our citizens. South Africa, Brazil, India and the USA share strong commitments to democracy, to overcoming our dark histories of religious and racial discrimination and to sustainable economic development without adverse impacts on our planet. We at Cornell are excited about the opportunity to work with the UFS on all of the clusters, but we are particularly looking forward to learning more about social transformation,” said Prof. Pell.

Media release
Issued by: Lacea Loader
Deputy Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za  
24 November 2009

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