Transparent low-profile OLEDs demonstrated in research project

As part of a research project funded by the German government, Osram Opto Semiconductors has developed prototype large, transparent OLED panels. Measuring 17 x 17 cm2 and with a luminous area of 210 cm2, the panels are only a few hundred micrometers thick. Also, they do not need separate encapsulation.

The test samples were developed as part of the TOPAS research project funded by the Germany Ministry for Education and Research (BMBF). The aim of the project is to produce 1 m2 transparent OLED modules and will run until 2011.

Osram Opto Semiconductors says that the OLED panels provide a clear indication of the direction that the OLED lighting market is taking. Apparently, there is a clear demand is for large, low-profile transparent light sources.

Even though the modules will have to be made larger they already have many of the properties that distinguish OLEDs from other light sources. They are extremely slim and no longer need expensive encapsulation. Their thickness is now defined only by the substrate as the carrier material – at present this is between 300 and 700 micron.

Further development work will lead to an even thinner carrier material and therefore even thinner OLEDs. These low-profile OLED modules will be even easier to use in all kinds of applications. They can be made in any shape, take up very little space and can be integrated so discreetly that they are only noticed when they are switched on (see photo).

“Transparent OLEDs, and flexible OLEDs at a later date, will add an entirely new aesthetic dimension to lighting solutions," said Karsten Heuser, head of the OLED division at Osram Opto Semiconductors. “The possibilities range from light sources that can be integrated in room dividers and furniture, for example, to entire windows that would allow natural light in during the day and flood the room with light at night.”

The OLED panels will be showcased at the Professional Lighting Design Convention (PLDC) from October 29 to 31, 2009 in Berlin. Osram says that the panels "provide an impressive foretaste of future applications" in which designers can "let their imaginations run wild".

The OLED panels can be made transparent without any obstructing features, due to new developments in electrode design, a special component architecture and a new approach to thin-film technology. Without any additional conductor-path structures on the light-emitting surface, the current is distributed evenly over the active surface, which in turn leads to uniform luminance.

The new technology also simplifies the manufacturing process, whether OLEDs are produced on a small molecule or polymer basis. Irrespective of the material of the active layers, the technology can be used for colored, warm white and cold while OLEDs. The next stage is to integrate the processes into a stable manufacturing operation.

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