Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Smoothing the way for economic flexible OLEDs

14.04.2010
The dream of low-cost, energy-efficient lighting on a big scale becomes tangible thanks to barrier coating systems for flexible OLEDs developed by Fraunhofer researchers

Organic light-emitting diodes (OLEDs) are nowadays synonymous with next generation lighting, which could replace common light-bulbs in a couple of years. They convert electricity very efficiently into light of high quality.

However, existing OLEDs on the market are costly and mostly deposited on rigid materials such as glass. The development of flexible, organic light-emitting diodes, which can be manufactured on an industrial scale, promises economies of scale and accordingly broader marketing of the environmentally sound and highly efficient devices.

Scientists from two renowned Fraunhofer Institutes from Dresden (Germany) assembled flexible, large-area organic light-emitting diodes with barrier layer systems which are necessary for long device lifetimes. The Fraunhofer Institute for Photonic Microsystems IPMS and the Fraunhofer Institute for Electron Beam and Plasma Technology FEP for the first time manufactured a flexible OLED in a roll-to-roll production and encapsulated the device in a subsequent inline-process. This process design would allow the production in a single plant.

The steps were developed in the frame of the project ROLLEX (roll-to-roll production of highly efficient light-emitting diodes on flexible substrates, support codes 13N8858 and 13N8857), funded by the German federal ministry of education and research (BMBF). Professor Karl Leo, director of the Fraunhofer IPMS, confirms: "The successful assembly of an OLED in a roll-to-roll process means a breakthrough on the way to highly efficient and competitive devices. The achievement of this project proves the capacity of Dresden as a focal point for research in organic electronics."

A major component of flexible organic LEDs is the homogenous encapsulation of luminescent layers with transparent barrier layer systems. Permeation of only small amounts of humidity or oxygen shortens the lifetime of the devices drastically, which explains the strong need for barrier systems protecting the luminescent materials on a large area without defects. However, the barrier layers should not absorb the emitted light and should not interfere with the colors of the light.

The researchers of the Fraunhofer Institutes deposited OLED materials on a cheap aluminum foil in a roll-to-roll pilot plant, further encapsulated the luminescent foil with a barrier layer system, patented by the Fraunhofer FEP, without compromising its luminosity. Dr. Christian May, head of the business unit "Organic Materials and Systems" at the Fraunhofer IPMS, is pleased about the promising project: "Developing the flexible OLED, experience from both institutes have been united in an optimal way. I am avid that we integrated the effective barrier layer systems developed from the Fraunhofer FEP into the OLED-technology of the Fraunhofer IPMS." Dr. Nicolas Schiller, head of the business unit "Coating of flexible products" at the Fraunhofer FEP adds: "The coating processes are all done in a roll-to-roll modus with a continuously moved substrate which opens up strong potential to reduce costs."

The technology developed by the two Fraunhofer Institutes marks a milestone on the way towards an industrial manufacturing of flexible OLEDs. Besides OLEDs, also other devices, such as organic solar cells or memory systems, could be realized in intermediate terms.

The work is going to be continued by the Dresden Institutes in a bigger consortium. More information on the achieved results can be found under http://www.rollex-projekt.de and http://www.ipms.fraunhofer.de/en/comedd/ as well as information about the Fraunhofer IPMS and Fraunhofer FEP under http://www.ipms.fraunhofer.de/en/ and http://www.fep.fraunhofer.de/enu/index.asp, respectively.

scientifical-contact:

Dr. Nicolas Schiller, head of business unit Coating flexible products, Fraunhofer Institute for Electron Beam and Plasma Technology FEP Dresden, Phone +49 351/2586-131, nicolas.schiller@fep.fraunhofer.de

press-contact:

Ines Schedwill, Fraunhofer Institute for Photonic Microsystems IPMS Dresden, Phone +49 351/8823-238, ines.schedwill@ipms.fraunhofer.de

Annett Arnold, Fraunhofer-Institut für Elektronenstrahl- und Plasmatechnik FEP Dresden, Phone +49 351/2586-452, annett.arnold@fep.fraunhofer.de

Annett Arnold | idw
Further information:
http://www.ipms.fraunhofer.de
http://www.ipms.fraunhofer.de/en/ and http://www.fep.fraunhofer.de/enu/index.asp

More articles from Physics and Astronomy:

nachricht Molecule flash mob
19.01.2017 | Technische Universität Wien

nachricht Magnetic moment of a single antiproton determined with greatest precision ever
19.01.2017 | Johannes Gutenberg-Universität Mainz

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland

19.01.2017 | Earth Sciences

Not of Divided Mind

19.01.2017 | Life Sciences

Molecule flash mob

19.01.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>