title: Tuning the Microcavity of Organic Light Emitting Diodes by Solution Processable Polymer-Nanoparticle Composite Layers.
abstract: In this study, we present a simple method to tune and take advantage of microcavity effects for an increased fraction of outcoupled light in solution-processed organic light emitting diodes. This is achieved by incorporating nonscattering polymer-nanoparticle composite layers. These tunable layers allow the optimization of the device architecture even for high film thicknesses on a single substrate by gradually altering the film thickness using a horizontal dipping technique. Moreover, it is shown that the optoelectronic device parameters are in good agreement with transfer matrix simulations of the corresponding layer stack, which offers the possibility to numerically design devices based on such composite layers. Lastly, it could be shown that the introduction of nanoparticles leads to an improved charge injection, which combined with an optimized microcavity resulted in a maximum luminous efficacy increase of 85% compared to a nanoparticle-free reference device.
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT) , Engesserstr. 13, 76131 Karlsruhe, Germany.
authors.forename: Jan B
authors.initials: JB
authors.lastname: Preinfalk
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT) , Engesserstr. 13, 76131 Karlsruhe, Germany.
authors.forename: Fabian R
authors.initials: FR
authors.lastname: Schackmar
authors.affiliation: Institute of Physics, University of Augsburg , Universitätsstr. 1, 86135 Augsburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Lampe
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT) , Engesserstr. 13, 76131 Karlsruhe, Germany.
authors.forename: Amos
authors.initials: A
authors.lastname: Egel
authors.affiliation: Institute of Physics, University of Augsburg , Universitätsstr. 1, 86135 Augsburg, Germany.
authors.forename: Tobias D
authors.initials: TD
authors.lastname: Schmidt
authors.affiliation: Institute of Physics, University of Augsburg , Universitätsstr. 1, 86135 Augsburg, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Brütting
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT) , Engesserstr. 13, 76131 Karlsruhe, Germany.|Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Gomard
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT) , Engesserstr. 13, 76131 Karlsruhe, Germany.|Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Uli
authors.initials: U
authors.lastname: Lemmer
keywords: conductive polymer; light outcoupling; microcavity; nanoparticle composites; organic light emitting diodes; silica nanoparticles; solution processing