Inkjet Printed ITO Dispersion as Transparent Conductive Anode for OLED Applications
A new mask-less process by inkjet-printiog of structured, transparent and conductive layers (TCL) applicable as electrodes for display and lighting applications has been developed. This new approach is based on dispersions of nano-particulate indium tin oxide (ITO) material and features manufacturing advantages; reduction of process steps, increase of material yield, compatibility with variable layouts and designs as well as substrate size and scalability for large areas by using direct printing instead of vacuum sputtering and edging. New sintering methods have been matched to the limited thermal stability of typical polymer-type substrates like PET, however they are equally suitable for glass-type substrates. The electrodes combine low sheet resistance below 100 Ω/□ and a transmittivity above 90％ on glass. This approach can be part of a new enabling technology for all-printed devices.The performance of a Novaled-PIN OLEDTM stack on top of this ITO TCL used as an anode has been characterized in detail. Typical performance data comprise very low operating voltages of 2.6 V for a red emitting and 2.8 V for a green emitting OLED at 100 cd/m2. A high current efficiency exceeding 6 cd/A has been demonstrated for a deep red device. The lifetime data is indicating more than 2 000 h at 500 cd/m2. The OLED device shows a Lambertian emission characteristic and no angular dependence of the color in the emission spectrum. This is due to die nano-particulate nature of die ITO anode, which results in a nano-porous layer with distinct light scattering behavior. Further applications in this context include liquid-crystal displays and AC thickfilm electroluminescence displays with a focus on low-information content types.
Transparent Conductive Oxide (TCO) Transparent Conductive Film (TCF) Organic Light-emitting Diode (OLED) Printing Display Lighting Signage
D. Adam M. Inhester T. L(u)thge M. Hofmann J. Birnstock
Degussa GmbH, Creavis Technologies & Innovation, Paul-BaumannStrasse 1, Science to Business Center, Novaled AG, Tatzberg 49, D-01307 Dresden, Germany
国际会议
上海
英文
918-919
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）