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SDK records 'highest' emissive frequency for organic EL tech

Posted: 21 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Showa Denko K.K.? SDK? organic electroluminescent device? organic EL? external quantum efficiency?

Showa Denko K.K. (SDK) has developed a single-layer organic electroluminescent (EL) device technology based on phosphorescent polymer materials, achieving what it touts as the industry's highest external quantum efficiency17 percent for green light and 16 percent for blue lightand closing the gap to realize the theoretical maximum quantum efficiency for the devices, which tips at 20 percent. The technology also features a durability of 350,000hrs. With this technology, SDK said, they will develop large surface-emission panels and will build a trial volume-production line by middle of the year.

To achieve these features, SDK has developed a copolymer in which phosphorescent substance and other materials are mixed. The company also used a cleaning/interface control technology. In a 100nm-thick organic EL that is sandwiched between electrodes, SDK explained, the cleanliness of electrode surface and work function can largely influence device performance.

The phosphorescent organic EL devices can theoretically produce four times higher emissive efficiency and cut electric consumption to a quarter compared to its fluorescent counterparts which are widely used today for cellphone displays.

SDK aims to use the technology to develop high-performance and stable organic EL panels for advertisement and display applications, utilizing the technology's high emissive efficiency, long durability and large area-emission functions. The company will market the new product by the end of 2008.

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