Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: [DS] Organic electronics and photovoltaics: simulations and optics II (jointly with CPP, HL, O)
O 32.1: Vortrag
Dienstag, 27. März 2012, 11:30–11:45, H 2032
Fast, stable and high-brightness light-emitting electrochemical cells — •Sebastian B. Meier1,2, Daniel Tordera3, Henk J. Bolink3, Wiebke Sarfert2, and Albrecht Winnacker1 — 1University of Erlangen-Nuremberg, Department of Materials Science, Chair VI: Materials for Electronics and Energy Technology, Erlangen, Germany — 2Siemens AG, Corporate Technology, GTF Organic Electronics, Erlangen, Germany — 3Instituto de Ciencia Molecular, Universitat de València, Paterna, Spain
Light-emitting electrochemical cells (LECs) are among one of the simplest class of light-emitting devices based on organic semiconducting materials. In its most facile form they just comprise a single solution-processed layer of an ionic transition metal complex (iTMC) sandwiched between two air-stable electrodes, which supports all the three events of charge injection, charge transport and radiative recombination. The ordinary architecture and the possibility to use stable electrode materials is a direct consequence of the ionic nature of the active layer enabling efficient charge injection with concomitant in-situ electrochemical doping resulting in the formation of a light-emitting p-i-n junction. There has been a longstanding issue in iTMC device operation between fast response and high stability when standard constant DC voltage is used, which is due to the dynamic nature of the junction. We will show how to stabilize the dynamic junction to achieve long-living (> 1000 h) high-brightness (> 1200 cd/m2) iridium(III) iTMC-based LECs possessing simultaneous fast turn-on times (< 20s) at considerable light intensity (> 200 cd/m2).