title: Efficient waveguide mode extraction in white organic light emitting diodes using ITO-anodes with integrated MgF₂-columns.
abstract: We report a simple approach to enhance the out-coupling efficiency in white organic light emitting diodes (WOLEDs). By incorporating MgF₂-columns into the ITO-anode and optimizing of their geometry, an overall efficiency enhancement of up to 38% is achieved. In addition, the structuring of the anode does not lead to a change in the electrical behaviour of the devices. As evidenced by goniometric measurements, the angular emission characteristics of the WOLEDs remain unchanged. Simulations, performed with the T-matrix method, reveal the effect of the enhanced outcoupling efficiency of this approach.
authors.affiliation: Light Technology Institute, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, D-76131 Karlsruhe, Germany. tobias.bocksrocker@kit.edu
authors.forename: Tobias
authors.initials: T
authors.lastname: Bocksrocker
authors.forename: Florian
authors.initials: F
authors.lastname: Maier-Flaig
authors.forename: Carsten
authors.initials: C
authors.lastname: Eschenbaum
authors.forename: Uli
authors.initials: U
authors.lastname: Lemmer
mesh_terms: D003116:Color; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry*; D008029:Lighting / Q000295:instrumentation*; D017616:Magnesium Compounds / Q000737:chemistry*; D012666:Semiconductors
chemical_list: D017616:Magnesium Compounds; C031288:magnesium fluoride; D005459:Fluorides