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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 launches journal on name change
2008-11-14

 

At the launch of the journal on name change were, from the left: Prof. Johan Lubbe, research associate of the Unit for Language Management at the UFS and guest editor of the magazine, Dr Lucie Möller, expert on geographical names and place name expert - and also an occasional member of the United Nations' committee of experts, Dr Peter Raper, research associate of the Unit for Language Management at the UFS, and Prof. Theo du Plessis, Director of the Unit for Language Management at the UFS. The magazine is dedicated to Dr Möller.
Photo: Lacea Loader

UFS launches journal on name change

From all the language issues coved in the English and Afrikaans printed media, the name change of place names is receiving the most attention. This is according to Prof. Johan Lubbe, research associate from the University of the Free State’s (UFS) Unit for Language Management, during the recent launch of a journal on name change on the Main Campus in Bloemfontein.

In the journal it is found, among other, that, as a result of the nature of the new democratic foundation of the ANC controlled government which puts the interests of the majority first, there is a move in the thinking and execution of name change. In this way not only names change but art, culture and heritage matters are democratically thought through and planned.

“As a directive from the South African Language Board (Pansalb), the Unit for Language Management at the UFS annually compiles the SA Language Monitor which reports on the language rights situation in South Africa as mainly reported by the print media. Issues about name change appeared throughout and this is why the unit decided to publish a journal with various perspectives on this,” said Prof. Lubbe, who is also the guest editor of the journal.

Other topics discussed in the journal include, among others, language visibility, a historical overview of the change in place names, the Khoisan influence on naming and naming amongst Xhosa speakers.

In a contribution on language visibility it is found that geographical naming policy and the national language policy does not correlate and language visibility as language mechanism is not considered. In a historical overview on the change of place names it is found that name change was never a calculated, political process and only after 2000 mention was made of a conscious, orchestrated process of name change.

In a further contribution on the name change of Johannesburg International airport, it was found that the government, by ignoring the sentiments of the minority, made itself guilty of splitting the nation in spite of pronunciations that nation building is a priority. Where African languages are concerned, it was found that the English name is increasingly being discarded in favour of the Xhosa name. This is apparently connected to the language debate in South Africa.

The journal, “Kritiese perspektiewe op naamsverandering” (“Critical perspectives on name change”) is a supplement to the “Acta Academica”, an accredited national journal that is independently publishing selected research articles in the human sciences and interdissiplinary fields. Nine cooperators from across the country made contributions to the journal.

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  
14 November 2008
 

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