Berlin 2005 – wissenschaftliches Programm

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.14: Poster

Montag, 7. März 2005, 18:00–20:00, Poster TU A

Charge injection layers for inverted organic light-emitting diodes — •Michael Kröger, Thomas Dobbertin, Jens Meyer, Torsten Rabe, Henning Krautwald, Eike Becker, Thomas Riedl, Hans-Hermann Johannes, and Wolfgang Kowalsky — Technische Universität Braunschweig, Institut für Hochfrequenztechnik

In this work charge injection layers for highly efficient inverted organic light-emitting diodes are discussed. Organic light emitting diodes (OLED) are expected to be a future technology for display applications. Single products employing the OLED-technology have been already introduced to the market. For the a generation of OLED-displays, which have to compete with established display-technologies, thin-film-transistors will be integrated onto the display-substrate itself. This involves the development of top-emitting organic light emitting diodes. Considering conventional bottom-emitting OLEDs a reversed deposition sequence results in such devices, speaking of inverted organic light emitting diodes (IOLED).

Highly efficient IOLEDs can be prepared by the introduction of charge injection layers, lowering the driving voltage and balancing the charge carrier distribution. The polymeric or doped small-molecule hole- and electron-transporting layers compared here show a high conductivity and great stability. Maximum efficiencies of 59.2 cd/A and 21.2 lm/W employing an inert silver cathode and a sputtered indium-tin-oxide (ITO) anode have been achieved.