Wednesday, May 12, 2004

[ODCAD] Philips-high efficiency polymer OLED (breakthroughs)

Improvement of power efficiency is critical for success of OLED display technology. Scientists from Philips claims that a breakthrough in that aspect has been made.

One development Philips made is using proper hole transportation layer (HTL) material. Usually, conductive polymer has more hole injected than electron, which results in waste of energy from extra hole. Choosing proper HTL material to reduce the hole injected can improve the power efficiency. (Sounds like anode junction barrier is increased) The quantum efficiency has been raised to 12% that is about 3 to 6 times higher than standard OLED devices.

Another development Philips made is dispersing a phosphorescent guest material into a light emitting polymer host. The polymer host used by Philips is carbazole-oxadiazole derivative. The guest material is iridium complex. A research fellow Meulenkamp from Philips presented the work on April 28, 2004 at the International Society for Optical Engineering's Photonics Europe conference in Strasbourg, France. Philips expects that these developments can significantly improve polymer OLED (PLED) device performance.

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