Micro-spherically textured organic light emitting diodes: A simple way towards highly increased light extraction

Abstract We demonstrate a method to increase the efficiency of white organic light emitting diodes (WOLEDs) by a factor of up to 3.7. By fabricating the WOLED on top of a monolayer of SiO 2 -microspheres we texture the WOLEDs spherically. We attribute the significant increase of the device efficiency to a larger area on the same footprint and to an enhanced outcoupling of waveguide and substrate modes. Measurements reveal that the I – V characteristic of the device as well as the emissive characteristic remains unchanged.