has been used as a substrate for a flexible organic electroluminescent device. An indium tin oxide (ITO) thin film on the polyimide substrate is shown to yield a high performance for the device, comparable to that of devices with conventional ITO-coated glass substrates. The Figure shows a photograph of the working device under a flexing load. (C.-S. Ha et al., September 16, Adv. Mater. 2002, 14, 1275-1279)