Light Emitting Polymermaterials: the Working Base for Flexible Full Color Displays
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LIGHT EMITTING POLYMER MATERIALS: THE WORKING BASE FOR FLEXIBLE FULL COLOR DISPLAYS Heinrich Becker, Esther Breuning, Arne Büsing, Aurelie Falcou, Susanne Heun, Amir Parham, Hubert Spreitzer, Jürgen Steiger, Philipp Stössel Covion Organic Semiconductors GmbH Industrial Park Hoechst, G865, 65926 Frankfurt am Main, Germany phone: ++49 (0) 69 305 81974; fax ++49 (0) 69 305 81907; email: [email protected] ABSTRACT In the last few years, industrial research into materials fulfilling the needs of the maturing OLED display industry has intensified considerably. A first generation of polymers (phenylPPVs) is now being commercially exploited in first monochrome polymer LED display applications. Based on these materials, non-planar displays have already been demonstrated . However, those proof of concept devices have been monochrome. Especially the RGB materials need considerable improvement to be suitable for flexible full color displays. We will therefore report on the progress in the development of polymers for red, green, and blue emission. Our main focus here is on improving the properties of various polymers derived from the spiro-bifluorene core. Depending on the color, the main issues vary strongly: For BLUE polymers, efficiency, color coordinates, and processibility are already at a commercial level while operational lifetime still needs strong improvement. RED materials are in an almost contrary situation: here, the operational lifetime is excellent, whereas the efficiency and the driving current are requiring further improvement. For GREEN, achieving saturated emission, whilst maintaining the other properties (high efficiency, long operational lifetime), is still challenging. We will demonstrate the current status of material development within Covion. In addition, we achieved advances in full-color patterning, especially techniques based on InkJet printing. This technology potentially allows the efficient manufacturing of high resolution RGB devices on a variety of substrates, including flexible layers.
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1. INTRODUCTION The technology based on OLEDs and also PLEDs made dramatic progress during the last couple of years. Whereas for small molecule OLEDs all types of displays, starting from small monochrome matrix-displays up to large area (14'') full-color demonstrators (e. g. by SONY, SAMSUNG), have been demonstrated, not all of these are already commercially available. The commercial products range from either monochrome displays for cell-phones to area color displays, e. g. for car radios. Nevertheless, other full-color applications are close to market entry. In the field of polymers, the development is some time behind that of small molecules. The first PLED product (a small monochrome matrix display) is just entering the market. Several other monochrome
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