compound semiconductor ♦ news digest

Philips Lumileds extends Future partnership

2010-04-15

Philips Lumileds has announced a continuation of its partnership with Future Lighting Solutions.

Future has enjoyed a ten-year collaboration with Philips as an exclusive distribution partner and this announcement further strengthens the relationship between the two firms.

As such, the company is to become a direct supplier of basic LED light engine components under the Philips LED licensing programme.

“This exciting expansion of our relationship will allow Philips and Future to enhance our offer to the OEM market, serving existing and new customers with a broader portfolio of LED lighting solutions and services,” commented Rudy Provoost, chief executive officer of Philips Lighting.

Elsewhere, Future was recently awarded the Industry Leadership prize in LED Journal’s annual Innova Awards.

It achieved recognition from the publication for its SSL Designer tool, having previously won the award in 2008 for its QLED Thermal Design and Simulation software - making this the second year in a row that the company has taken home this accolade.

Flexible OLEDs from Fraunhofer

2010-04-19

Low-cost, energy efficient lighting 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 colours of the light.

The researchers of the Fraunhofer Institutes deposited OLED materials on a cheap aluminium foil in a roll-to-roll pilot plant, further

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