Charge generation layers for all-solution processed organic tandem light emitting diodes with regular device architecture

Stefan Höfle; Christoph Bernhard; Michael Bruns; Christian Kübel; Torsten Scherer; Alexander Colsmann

doi:10.1117/12.2188041

5 October 2015 Charge generation layers for all-solution processed organic tandem light emitting diodes with regular device architecture

Stefan Höfle, Christoph Bernhard, Michael Bruns, Christian Kübel, Torsten Scherer, Alexander Colsmann

Author Affiliations +

Proceedings Volume 9566, Organic Light Emitting Materials and Devices XIX; 95660I (2015) https://doi.org/10.1117/12.2188041
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

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.

Conference Presentation

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Stefan Höfle, Christoph Bernhard, Michael Bruns, Christian Kübel, Torsten Scherer, and Alexander Colsmann "Charge generation layers for all-solution processed organic tandem light emitting diodes with regular device architecture", Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 95660I (5 October 2015); https://doi.org/10.1117/12.2188041

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