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CPP: Chemische Physik und Polymerphysik
CPP 19: SYMPOSIUM Functional Organic Thin Films I
CPP 19.6: Talk
Thursday, March 30, 2006, 11:30–11:45, ZEU Lich
Full-Organic and Highly Efficient Top-emitting PIN-OLEDs for Display Applications — •Michael Hofmann1, Thomas Stübinger1, Philipp Wellmann1, Martin Vehse1, Jan Birnstock1, Ansgar Werner1, Jan Blochwitz-Nimoth1, and Qiang Huang2 — 1Novaled GmbH, Tatzberg 49, 01307 Dresden, Germany — 2TU Dresden, George-Bähr-Straße 1, 01069 Dresden, Germany
The next generation of active matrix displays is going to incorporate bright top-emitting organic LEDs. The top-emission design with high aperture ratio of 70% is favourable, because bottom emitting OLEDs suffer from the area occupation of advanced driving circuitry in the backplane. The concept of doped charge transport layers will easily enable the implementation on TFT-substrates. Furthermore, the approach ensures low operating voltage and high power efficiency over a large brightness range. Additionally, doped OLEDs can be adapted to a variety of electrode materials.
Essential requirements for OLED applications on reflective substrates are summarized. Performance and emission characteristics as well as lifetime data of full-organic OLED-stacks using molecular p- and n-doped transport layers are presented. In order to improve the quality of OLED-devices, thin film simulation tools are applied to study the influence of organic layer thicknesses and optical properties of both the top-most semi-transparent electrode and the reflective bottom contact. Microcavity effects are revealed and light outcoupling means are proposed.