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OLLA delivers its first milestones: Novel materials, devices and ITO-free OLED lighting device demonstrated

18 months after its start, the EU OLLA project delivers its first promising milestone to the European Commission. The deliverable is an advanced white Organic Light-Emitting Diode (OLED) prototype light source, with an efficacy of more that 10 lm/W, emitting several thousand hours at 1000 cd/m² brightness.

This initial result makes use of Novaleds P-I-N (R) doping technology, which enables increased efficiency with long lifetime at lower driving voltages. “With this approach further strong improvements of OLED technology can be expected." said Dr. Jan Blochwitz-Nimoth, CTO of Novaled. “Indeed we have made substantial progress in nearly all working areas within the project ’ comments Peter Visser, project manager of the European integrated project OLLA. “New chemical compounds for OLEDs have been synthesized, characterized and transferred to other partners to be tested in OLED devices. Further on optical light out coupling structures were investigated and our modeling activities helped us to get a much deeper understanding of the basic processes inside OLEDs. These results show our combined progress in view of large area lighting.’ Among these first results, also an indium tin oxide (ITO) free OLED device has been demonstrated within OLLA. Indium tin oxide coatings are commonly used as conductive anode material for OLEDs and liquid crystal display (LCD) panels. Due to the growing demand of mainly flat-panel displays, the price of the rare metal indium has been driven sky-high from 60 US$ per kilogram in 2002 to nearly 1000 US$ today. As OLEDs gain more and more interest in the field of lighting applications, the consumption of indium is expected to further rise in the future. To replace ITO, a newly developed conductive polymer from H.C. Starck was employed by the OLLA project. “ Until now, our BAYTRON® is used as layer on top of ITO anodes as Hole Injection Layer (HIL) to improve brightness, lower the driving voltages, and to reduce the defect density of OLEDs. “ said Dr Andreas Elschner of H.C. Starck. “ We have developed a new formulation of Baytron®, which is especially tailored to reach high conductivity and good optical properties for use in OLED applications. “ BAYTRON® PH500 is a new formulation of the conductive polymer Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate), or PEDOT/PSS in short. It can be applied in solution by common spin-coating, printing or inkjet techniques. In close cooperation with H.C. Starck, the TU Dresden based Institut für Angewandte Photophysik (IAPP) now demonstrated a first 1.1 cm² green OLED using the new BAYTRON® PH500 formulation instead of a normal ITO anode. “ We measured an efficiency of 18.7 lm/W at 1000 cd/m² brightness”‘, IAPP’s Dr Karsten Walzer said, “which is an amazingly high value. We could even show that OLEDs on PH500 are more efficient than on ITO. This is due to their better matching optical properties within the OLED.” More detailed research results will be disclosed during a presentation by IAPP on the SPIE Photonics Europe conference in Strasbourg. “This encouraging result is one example of many steps we still have to make before commercializing OLEDs in Lighting applications becomes reality. ” comments Dr Dietrich Bertram of Philips Lighting and technical coordinator of OLLA, “A possible elimination of the ITO layer is a very interesting option in developing this technology towards commercialization, coming out of OLLA“. Bertram explains. “ However, as the feasibility now has been shown on 1cm2, additional research has to be done on larger areas “. =====================background=========== About the OLLA project: OLLA is a joint research project on the development of white OLEDs for general lighting applications. Goal of the OLLA project is to demonstrate in 2008 high-brightness white OLED light tiles with a long lifetime and high energy efficiency. The consortium has 24 partners in 8 European countries. OLLA is partially funded under the IST (Information Society Technologies) priority of the European Union’s 6th Framework Programme. www.olla-project.org. About OLEDs OLEDs are a novel and attractive class of solid-state light sources, which are thin, flat and lightweight and generate a diffuse, non- glaring illumination. Due to its freedom of design, OLED lighting technology offers possibilities for a range of new lighting applications. OLEDs could also be used in lighting systems with controllable color, allowing users to customize their light atmosphere at home. Furthermore, as a high efficient light source, the technology has the potential of achieving substantial energy savings. About H.C. Starck: H.C. Starck is an international group of companies with more than 3,400 employees at production sites in Europe, North America and the Far East. The companies produce functional materials for electronic applications, like anti-static and high conductive coatings, OLEDs, and capacitors. H.C. Starck has been part of the Bayer Group since 1986. About IAPP The Institut für Angewandte Photophysik of Technische Universität Dresden, Germany, is specialized in controlled doping of organic semiconductors. IAPP develops well-conductive organic thin films and introduces them, e.g. in organic LED prototypes. It’s activities cover a broad range of organic electronics, reaching from basic studies to complex devices, such as OLEDs and organic solar cells. Approximately 40 researchers are working in this field, 10 of them with OLEDs. Several spin-off companies, among them Novaled AG, have been founded over the last years. About Novaled Novaled provides world-leading OLED technology and materials to display and lighting manufacturers for making the most power-efficient and easy-to-manufacture OLED devices. The unique doping approach of Novaled PIN OLEDTM technology leads to lowest operating voltages combined with high current efficiencies and great flexibility in OLED design. The company has a strong IP position in OLED technology based on more than 160 patents granted or pending. About Royal Philips Electronics Royal Philips Electronics of the Netherlands (NYSE: PHG, AEX: PHI) is one of the world's biggest electronics companies and Europe's largest, with sales of EUR 30.4 billion in 2005. With activities in the three interlocking domains of healthcare, lifestyle and technology and 159,200 employees in more than 60 countries, it has market leadership positions in medical diagnostic imaging and patient monitoring, color television sets, electric shavers, lighting and silicon system solutions. News from Philips is located at http://www.philips.com/newscenter.

Keywords

OLED, LIGHTING

Countries

Austria, Belgium, Czechia, Germany, Denmark, Estonia, Greece, Spain, Finland, France, Hungary, Ireland, Italy, Lithuania, Luxembourg, Latvia, Malta, Netherlands, Poland, Portugal, Sweden, Slovenia, Slovakia