In this study, we reported the improved light outcoupling efficiency of an OLED by antireflective periodic
micro-pyramids structure. The flexible PET substrate with the micro-pyramids structure was fabricated using
fully Roll-to-Roll(R2R) processed method. During the measurement, the light emission from the OLED with
the texture structure has light enhancement of 1.3 times. A special angle of far-field pattern is also observed
from the OLED with the texture structure due to periodic structure of the pyramids.
