High-Efficiency Linearly Polarized Organic Light-Emitting Diodes

Thin-film light-emitting diodes (LEDs) with linearly polarized emission enable advanced photonic applications. Here, we demonstrate a linearly polarized light emission organic LED by utilizing the intrinsic polarization nature of the transverse electric (TE) waveguide mode present in the device and extracting it using a linear grating. With a device having 67.6% of the light trapped in the TE waveguide mode, we demonstrated a linearly polarized organic LED with a high current efficiency (CE) of 136 cd/A and a large polarization ratio above 30. Our analysis indicates that the CE can further be increased at least by 2-fold to 280 cd/A. Our device architecture can easily be adopted for other thin-film LED platforms for photonic applications.