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Printed Electronics World
Posted on November 28, 2011 by  & 

Successful advancement of OLED technology

Upon its recent official termination, the European research project OLED100.eu celebrates the achievement of important advancements in bringing organic light-emitting diodes (OLEDs) closer to market introduction in general lighting.
 
Fifteen companies and research institutes from six European countries have been working on this goal since September 2008. During this period, not only technical issues have been investigated and solved, also the acceptance levels and preferences of end-users with respect to this novel lighting technology have been studied. Moreover, the research consortium has developed a large-area OLED luminaire that consists of nine 33 ¡Ñ 33 cm2 OLED tiles.
 
With OLED100.eu the consortium has focused on the five goals:
  • Increase of the luminous efficacy
  • Increase of the lifetime
  • Up-scaling of the light-emitting area
  • Reducing manufacturing cost by optimized processes
  • Measurement standardization based on application research
The most relevant results are:
 
High efficiency OLEDs based on Novaled PIN OLED technology and out-coupling materials showing 60 lm/W which are more efficient than energy saving lamps
  • Long lifetime OLEDs with Novaled knowhow, demonstrating 100,000 hours comparable to inorganic LED lifetime
  • Perception case studies on taste and acceptance of OLEDs as light source
  • Industrialisation scenarios and cost calculation of manufacturing processes with an emphasis on cost-efficient technologies like screen printing for substrate structuring
  • Work on standardisation of measurement procedures for OLEDs, which now serve as basis for work of the International Commission on Illumination CIE
Today OLED100.eu presents for the first time the large-area OLED luminaire, which consists of nine 33 ¡Ñ 33 cm2 OLED tiles with an optimized luminance distribution for application in shop lighting.
 
 
"The OLED100.eu research consortium has played a vital part in ensuring that Europe will play a leading role in OLED technology for lighting applications also in the future," says Dr.Stefan Grabowski, Senior Scientist at Philips Research Aachen and project manager of OLED100.eu.
 
"The results of OLED100.eu will contribute to further increase the acceptance of OLED technology", comments Dr. Karsten Diekmann, who is responsible for OLED product and application development at OSRAM. "In the project we gained a better understanding of end-user preferences, a better comparability through standardized measurement procedures, and better OLEDs."
 
Dr. Christian May, Head of Business Unit OLED Lighting, gets excited about the project results: "The work to achieve the challenging goals of the OLED 100.eu project brought us to a higher level of our COMEDD pilot process line. We are really proud of the 33 x 33 cm2 large OLED panels, which are one of the largest worldwide and made at our pilot process line."
 
Similar to inorganic LEDs, OLEDs are semiconductor devices, which convert current into light. While inorganic LEDs are point light sources, OLEDs emit light over a large area.
 
 
OLEDs consist of different organic materials that are deposited on a substrate. The light emitting area has a thickness of only about 400 nanometres, a hundred times thinner than a human hair. In off-state, OLEDs can be either mirror-like, neutral white or transparent.
 
Partners in the OLED100.eu consortium include:
  • Bartenbach LichtLabor GmbH, Austria
  • European Photonics Industry Consortium (EPIC), France
  • Evonik Degussa GmbH, Germany
  • Fraunhofer Institut fur Photonische Mikrosysteme (IPMS), Germany
  • Microsharp Corporation Limited, U.K.
  • Novaled AG, Germany
  • Oce Technologies B.V., The Netherlands
  • OSRAM, Germany
  • Philips Technologie GmbH, Business Center OLED Lighting ¡V Lumiblade, Germany
  • Philips Technologie GmbH Forschungslaboratorien, Germany
  • Physikalisch-Technische Bundesanstalt (PTB), Germany
  • Saint-Gobain Recherche S.A., France
  • Siemens AG, Germany
  • Technische Universitat Dresden, Institut fur Angewandte Photophysik (IAPP), Germany
  • Universiteit Gent, Belgium
Technical data of the presented OLED-tiles:
  • Size: 33 × 33 cm2
  • Light-emitting area: 828 cm2
  • Driving voltage and current: 45 V / 250 mA
  • Luminance: 1000 cd/m2
  • Efficacy: 27 lm/W
  • Lifetime: 10,000 h (Decrease of luminance to 50%)
Further information on the research project can be found on the website:
 
 
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