A simple effective method to improve light out-coupling in organic light-emitting diodes by introducing pyramid-based texture structure

Abstract This paper showed a very simple method to increase the light extraction of organic light-emitting diodes (OLEDs) by attaching an inverted pyramid texture film to them. The texture film was fabricated by transferring the pyramid-based textured morphology of mono-crystalline silicon surface using a printing process. Compared to the reference device, our results showed a great improvement in the current efficiency (+37.0%) and external quantum efficiency (+36.6%) at a current density of 100 mA/cm 2 . Furthermore, the EL spectrum and CIE coordinates of the OLEDs did hardly vary with the introduction of the texture film and variation of viewing angles, and the OLED with the texture film was proved to be a perfect Lambertian emitter, which suggested that the utilization of this method was a promising approach for the development of OLEDs and could be suggestive conduction to EL lightening and backlight.