White Organic Light-Emitting Diode With Linearly Polarized Emission

An organic light emitting diode (OLED) with a linearly polarized white light emission is demonstrated using a nanograting structure. The aluminum based grating structure is fabricated by laser interference lithography and formed on the back side of the glass substrate of the OLED. The nanograting structure functions as a polarizer to select the transverse magnetic wave in the wavelength range of 400-700 nm. The polarization characteristics are studied experimentally and theoretically in detail. The experimental results agree well with the simulation by a rigorous coupled wave analysis. The polarization ratio of the polarizer can reach as high as 93.4%.