Polarized red, green, and blue light emitting diodes fabricated with identical device configuration using rubbed PEDOT:PSS as alignment layer

Zhang Haoran, Zhang Qi^‡, Zhang Qian, Sun Huizhi, Hai Gang, Tong Jing, Xu Haowen, Xia Ruidong^§

(a) LED configuration: ITO (120 nm)/PEDOT:PSS (rubbed, 30 nm)/polymer (aligned 70 nm)/LiF (1 nm)/Al (120 nm). (b) Polarized EL spectra of the polymers and blends. Filled and open symbols represent polarizer detection parallel and perpendicular to the rubbing direction (squares for PFO, down-triangles for F8BT, up-triangles for PFO/F8BT, and circles for F8BT/Red F).