Positive conclusion: Fraunhofer AWZ established as an important partner for the lighting and illumination industry

In the future, the Fraunhofe AWZ in Soest will also contribute to strengthening the future viability and competitiveness of the lighting and illumination industry. This is the result of an evaluation of the research facility, which was founded in 2013.

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AOFA-Workshop at AWZ welcomes 150 participants

A highlight of the workshop was the presentation of the Rudolf Jaeckel Prize of the Deutsche Vakuumgesellschaft e.V. (DVG) to Prof. Dr. Eicke R. Weber of the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg.

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Thermally stable phosphors for white LEDs

In some of the white LEDs available commercially, the phosphor is gradually damaged by heat generated by high operating currents. The Fraunhofer AWZ is finding out how to prevent this.

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Luminescent lenses for white light-emitting diodes

Light-emitting diodes (LEDs) are the future of lighting. However, white LEDs have »cold white« color rendering. Fraunhofer AWZ uses a combination of several rare earths to set a wide range of colors and color temperatures.

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Thermal imaging of LEDs

Non-contact and spatially resolved determination of the surface temperature of LED modules is possible with the help of infrared thermography. The Fraunhofer AWZ makes use of this method to improve LED's lifetime.

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Phosphors

Leuchtstoffe Gläser
© Fraunhofer IMWS
Special, rare earth-doped lenses under excitation with UV light.

In recent years, the light-emitting diode (LED) has established itself as a universal artificial light source. Modern high-power LEDs offer numerous advantages in terms of efficiency, compactness, lifetime and environmental protection as compared to conventional incandescent and energy-saving lamps. The tuneability of its light and its small size opens up completely new possibilities for lighting design.

 

Increased demands

As the LED is established as lighting element, the task is now to further develop the technology for increased demands. Light management by intelligent control systems for interactive or automated control and energy saving (»Smart Lighting«) as well as advanced lighting concepts for stimulating the biological effects of light on humans (»Human Centric Lighting«) place new demands on the lighting environment. The digitalisation of processes in product development (»Digital Prototyping«), the networking of luminaires for monitoring the operating status (»Predictive Maintenance«) and for the distributed acquisition of sensor data (»Internet of Things«) also represent tasks for development.

 

New Challenges

New challenges not only consist of improving the LED chips, but also in the phosphors and encapsulation materials. In addition to the efficiency of the LEDs and the phosphor, reliability and colour stability are also important aspects. The thermal management in LEDs and LED modules  is of crucial importance.

 

Research and development

In the field of phosphors, our range of services consists of the evaluation, design, and development of phosphors and phosphor systems with the aim of improving their efficiency, reliability, and colour stability. In order to do so, we apply comprehensive optical and spectroscopic analyses, thermal and microstructural characterizations at the Fraunhofer Application Center in Soest as well as investigations into the long-term stability of light-emitting diodes and lighting elements.

The output of our research activities have led to phosphor-doped glasses and glass ceramics for lighting and lighting technology as well as medical diagnostics. Further research fields include the characterization of optics for light-emitting diodes as well as the microstructuring of optics and phosphors.

Our topics:

  • Characterization and assessment of luminaires, light-emitting diodes and phosphors and their long-term stability
  • Production and development of phosphor doped lenses and glass ceramics
  • Thermal management and photometric und photometric assessment of luminaires, light-emitting diodes (LEDs) and LED modules
  • Surface and element investigations, thermal and thermokinetic analyses
  • Structuring of LED optics and phosphors