title: Highly efficient white top-emitting organic light-emitting diodes comprising laminated microlens films.
abstract: White top-emitting organic light-emitting diodes (OLEDs) attract much attention, as they are optically independent from the substrate used. While monochrome top-emitting OLEDs can be designed easily to have high-emission efficiency, white light emission faces obstacles. The commonly used thin metal layers as top electrodes turn the device into a microresonator having detrimental narrow and angular dependent emission characteristics. Here we report on a novel concept to improve the color quality and efficiency of white top-emitting OLEDs. We laminate a refractive index-matched microlens film on the top-emitting device. The microlens film acts both as outcoupling-enhancing film and an integrating element, mixing the optical modes to a broadband spectrum.
authors: Institut für Angewandte Photophysik, TU Dresden, George-Bähr-Strasse 1, D-01069 Dresden, Germany.
authors: Michael
authors: M
authors: Thomschke
authors: Sebastian
authors: S
authors: Reineke
authors: Björn
authors: B
authors: Lüssem
authors: Karl
authors: K
authors: Leo
mesh_terms: D003116:Color; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008029:Lighting / Q000295:instrumentation*; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D009930:Organic Chemicals / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D009930:Organic Chemicals