HYPERBRANCHED POLYMERS FOR ELECTROLUMINESCENCE APPLICATIONS

Communication: Three-dimensional hyperbranched polymers are shown to b e new candidates for emitting materials in light-emitting devices (LED s). Owing to the properties of hyperbranched polymers, devices incorpo rating them are expected to have improved stability and efficiency com pared to LEDs made from linear polymers. The performance of a bilayer electroluminescence device is reported in which the electron-transport layer is made of a hyperbranched polycarbazole and a newly synthesize d linear polymer constitutes the hole-transport layer.