title: Emissive Polyelectrolytes As Interlayer for Color Tuning and Electron Injection in Solution-Processed Light-Emitting Devices.
abstract: Herein we present a solution-processed hybrid device architecture combining organic light-emitting diodes (OLEDs) and light-emitting electrochemical cells (LECs) in a bilayer architecture. The LEC interlayer promotes the charge injection from an air-stable Ag cathode as well as permits the color tuning of the device emission. To this end, we used an alcohol-soluble anionic polyfluorene derivative, the properties of which were investigated by absorption and photoluminescence spectroscopy as well as by cyclic voltammetry. The bilayer device exhibited operating voltages ∼6 V and a color tuning of the emission spectrum dependent on the LEC interlayer thickness. The hybrid devices presented a color emission ranging from the yellow (x = 0.39, y = 0.47) toward the green region (x = 0.29, y = 0.4) of the Commission Internationale de I'Eclairage (CIE) 1931 chromaticity diagram.
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology , Engesserstr. 13, 76131 Karlsruhe, Germany.|InnovationLab , Speyerer Str. 4, 69115 Heidelberg, Germany.
authors.forename: Serpil
authors.initials: S
authors.lastname: Tekoglu
authors.affiliation: InnovationLab , Speyerer Str. 4, 69115 Heidelberg, Germany.|Organisch-Chemisches Institut, Ruprecht-Karls-Universität , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Petzoldt
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology , Engesserstr. 13, 76131 Karlsruhe, Germany.|InnovationLab , Speyerer Str. 4, 69115 Heidelberg, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Stolz
authors.affiliation: Organisch-Chemisches Institut, Ruprecht-Karls-Universität , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany.
authors.forename: Uwe H F
authors.initials: UH
authors.lastname: Bunz
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology , Engesserstr. 13, 76131 Karlsruhe, Germany.|Institute of Microstructure Technology, Karlsruhe Institute of Technology , Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Uli
authors.initials: U
authors.lastname: Lemmer
authors.affiliation: InnovationLab , Speyerer Str. 4, 69115 Heidelberg, Germany.|Organisch-Chemisches Institut, Ruprecht-Karls-Universität , Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany.
authors.forename: Manuel
authors.initials: M
authors.lastname: Hamburger
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology , Engesserstr. 13, 76131 Karlsruhe, Germany.|InnovationLab , Speyerer Str. 4, 69115 Heidelberg, Germany.
authors.forename: Gerardo
authors.initials: G
authors.lastname: Hernandez-Sosa
keywords: LECs; OLEDs; conjugated polyelectrolyte; electron injection layer; polyfluorene