Inkjet-printed embedded Ag-PEDOT: PSS electrodes with improved light out coupling effects for highly efficient ITO-free blue polymer light emitting diodes
Abstract
We report on solution processed polymer light emitting diodes (PLEDs) using inkjet-printed embedded and non-embedded metal grid anodes. Metal grids were inkjet-printed in a honeycomb layout. Honeycomb dimensions were varied from 3 mm to 8 mm to optimize device performance. Inkjet-printed grids were then coated with a highly conductive PEDOT:PSS formulation. First experiments on PEDOT: PSS coated, non-embedded metal grid anodes showed that grids with a 3 mm honeycomb diameter have a similar efficiency as optimized indium tin oxide (ITO) based reference devices. To further improve the efficiency of the devices, the honeycomb Ag-grids were embedded in an Ormocer (R)-based material. A detailed performance analysis of PLEDs fabricated on ITO, non-embedded and embedded grids was carried out. It is shown that reduced leakage current and enhanced light outcoupling by embedding result in a significant efficiency enhancement of 250% in inkjet-printed embedded Ag-PEDOT: PSS ITO-free PLEDs, compared to the ITO-based reference PLEDs.
Author(s)
Kinner, Lukas
NanoTecCenter Weiz Forschungsgesellschaft mbH, Franz-Pichler-Str. 32, 8160 Weiz, Austria
Nau, Sebastian
NanoTecCenter Weiz Forschungsgesellschaft mbH, Franz-Pichler-Str. 32, 8160 Weiz, Austria
Popovic, Karl
NanoTecCenter Weiz Forschungsgesellschaft mbH, Franz-Pichler-Str. 32, 8160 Weiz, Austria
Sax, Stefan
NanoTecCenter Weiz Forschungsgesellschaft mbH, Franz-Pichler-Str. 32, 8160 Weiz, Austria
Burgués-Ceballos, Ignasi
Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 45 Kitiou Kyprianou Street, 3014 Limassol, Cyprus
Hermerschmidt, Felix
Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 45 Kitiou Kyprianou Street, 3014 Limassol, Cyprus
Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 45 Kitiou Kyprianou Street, 3014 Limassol, Cyprus
List-Kratochvil, Emil J.W.
Institut für Physik, Institut für Chemie & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 6, 12489 Berlin, Germany
