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Inkjet-printed embedded Ag-PEDOT: PSS electrodes with improved light out coupling effects for highly efficient ITO-free blue polymer light emitting diodes

: Kinner, Lukas; Nau, Sebastian; Popovic, Karl; Sax, Stefan; Burgués-Ceballos, Ignasi; Hermerschmidt, Felix; Lange, Alexander; Boeffel, Christine; Choulis, Stelios A.; List-Kratochvil, Emil J.W.


Applied Physics Letters 110 (2017), No.10, Art. 101107, 6 pp.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
European Commission EC
FP7-NMP; 604568; PLASMAS
Journal Article
Fraunhofer IAP ()

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.