Polarized light emission was observed in conjugated polymer electroluminescent diodes comprising rubbing‐aligned poly(2,5‐dinonyloxy‐1,4‐phenylenevinylene) as the emissive layer. By using 2‐(4‐biphenyly1)‐5‐(4‐tert‐butylphenyl)‐1,3,4‐oxadiazole dispersed in polystyrene as the electron‐transporting/hole‐blocking layer, the electroluminescence efficiency and the dichroic ratio of the electroluminescent light increased, resulting in polarized electroluminescence with a dichroic ratio of 4.0. ©1995 American Institute of Physics.