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Title: Inkjet-printed embedded Ag-PEDOT:PSS electrodes with improved light out coupling effects for highly efficient ITO-free blue polymer light emitting diodes
Authors: Kinner, Lukas 
Nau, Sebastian 
Popovic, Karl 
Sax, Stefan 
Burgués-Ceballos, Ignasi 
Hermerschmidt, Felix 
Lange, Alexander 
Boeffel, Christine 
Choulis, Stelios A. 
List-Kratochvil, E.J.W. 
Keywords: Anodes;Electrodes;Light emitting diodes;Plastic coatings;Tin oxides
Category: Mechanical Engineering
Field: Engineering and Technology
Issue Date: 6-Mar-2017
Publisher: American Institute of Physics Inc.
Source: Applied Physics Letters, 2017, Volume 110, Issue 10, Article number 101107
metadata.dc.doi: 10.1063/1.4978429
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®-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.
ISSN: 00036951
Rights: © 2017 Author(s).
Type: Article
Appears in Collections:Άρθρα/Articles

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