Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: [DS] Organic Electronics and Photovoltaics II (jointly with CPP, HL, and O)
O 71.1: Vortrag
Donnerstag, 17. März 2011, 12:00–12:15, GER 38
Improving the performance of phosphorescent light-emitting electrochemical cells without sacrificing stability — •Sebastian Meier1,2, Wiebke Sarfert2, David Hartmann2, and Albrecht Winnacker1 — 1University of Erlangen-Nuremberg, Department of Materials Science, Chair VI: Materials for Electronics and Energy Technology, Martensstr. 7, 91058 Erlangen, Germany — 2Siemens AG, Corporate Technology, GTF ORE, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
Within the past few years a novel class of solution-processable solid-state organic light-emitting devices referred to as light-emitting electrochemical cells (LECs) has attracted considerable interest. Key feature of these devices is the existence of mobile ions within the active layer, which enable in-situ electrochemical doping with subsequent formation of a light-emitting p-n-junction. Due to their simple architecture and the use of air-stable electrodes LECs are regarded as an attractive approach for flexible large area lighting applications.
To compete with state of the art lighting technologies, however, the overall device performance of LECs has to be improved. For this purpose, an optimization of the device configuration and processing conditions as well as the use of a proper driving mode can be helpful. We show that the performance can be significantly enhanced due to modifications in the stack configuration (e.g. interfaces, layer thickness, cathode), processing conditions and by an adequate mode of operation without any losses in the device stability.