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Proceedings Paper

Inverted topside-emitting organic light-emitting diodes
Author(s): Thomas Dobbertin; Daniel Schneider; Anis Kammoun; Jens Meyer; Oliver Werner; Michael Kroeger; Thomas Riedl; Eike Becker; Christian Schildknecht; Hans-Hermann Johannes; Wolfgang Kowalsky
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Paper Abstract

Top-emitting organic light-emitting diodes (OLEDS) for next-generation active-matrix OLED-displays (AM-OLEDs) are discussed. The emission of light via the conductive transparent top-contact is considered necessary in terms of integrating OLED-technology to standard Si-based driver circuitry. The inverted OLED configuration (IOLED) in particular allows for the incorporation of more powerful n-channel field-effect transistors preferentially used for driver backplanes in AM-OLED displays. To obtain low series resistance the overlying transparent electrode was realized employing low-power radio-frequency magnetron sputter-deposition of indium-tin-oxide (ITO). The devices introduce a two-step sputtering sequence to reduce damage incurred by the sputtering process paired with the buffer and hole transporting material pentacene. Systematic optimization of the organic growth sequence focused on device performance characterized by current and luminous efficiencies is conducted. Apart from entirely small-molecule-based IOLED that yield 9.0 cd/A and 1.6 lm/W at 1.000 cd/m2 a new approach involving highly conductive polyethylene dioxythiophene-polystyrene sulfonate (PEDOT:PSS) as anode buffers is presented. Such hybrid IOLEDs show luminance of 1.000 cd/m2 around 10 V at efficiencies of 1.4 lm/W and 4.4 cd/A.

Paper Details

Date Published: 16 February 2004
PDF: 12 pages
Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); doi: 10.1117/12.505811
Show Author Affiliations
Thomas Dobbertin, Technische Univ. Braunschweig (Germany)
Daniel Schneider, Technische Univ. Braunschweig (Germany)
Anis Kammoun, Technische Univ. Braunschweig (Germany)
Jens Meyer, Technische Univ. Braunschweig (Germany)
Oliver Werner, Technische Univ. Braunschweig (Germany)
Michael Kroeger, Technische Univ. Braunschweig (Germany)
Thomas Riedl, Technische Univ. Braunschweig (Germany)
Eike Becker, Technische Univ. Braunschweig (Germany)
Christian Schildknecht, Technische Univ. Braunschweig (Germany)
Hans-Hermann Johannes, Technische Univ. Braunschweig (Germany)
Wolfgang Kowalsky, Technische Univ. Braunschweig (Germany)


Published in SPIE Proceedings Vol. 5214:
Organic Light-Emitting Materials and Devices VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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