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Proceedings Paper

Charge generation layers for all-solution processed organic tandem light emitting diodes with regular device architecture
Author(s): Stefan Höfle; Christoph Bernhard; Michael Bruns; Christian Kübel; Torsten Scherer; Alexander Colsmann
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Paper Abstract

We present multi-photon OLEDs where enhanced light emission was achieved by stacking two OLEDs utilizing a regular device architecture (top cathode) and an intermediate charge carrier generation layer (CGL) for monolithic device interconnection. With respect to future printing processes for organic optoelectronic devices, all functional layers were deposited from solution. The CGL comprises a low-work function zinc oxide layer that was applied from solution under ambient conditions and at moderate processing temperatures and a high-work function interlayer that was realized from various solution processable precursor-based metal oxides, like molybdenum-, vanadium- and tungsten-oxide. Since every injected electron-hole pair generates two photons, the luminance and the current efficiency of the tandem OLED at a given device current are doubled while the power efficiency remains constant. At a given luminance, the lower operating current in the tandem device reduces electrical stress and improves the device life-time. ToF-SIMS, TEM/FIB and EDX analyses provided evidence of a distinct layer sequence without intermixing upon solution deposition.

Paper Details

Date Published: 5 October 2015
PDF: 18 pages
Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 95660I (5 October 2015); doi: 10.1117/12.2188041
Show Author Affiliations
Stefan Höfle, Karlsruher Institut für Technologie (Germany)
Christoph Bernhard, Karlsruher Institut für Technologie (Germany)
Michael Bruns, Karlsruher Institut für Technologie (Germany)
Christian Kübel, Karlsruher Institut für Technologie (Germany)
Torsten Scherer, Karlsruher Institut für Technologie (Germany)
Alexander Colsmann, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 9566:
Organic Light Emitting Materials and Devices XIX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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