Electroluminescent properties of side-chain naphthalimide-derivated polymers

Six homopolymers derived from the naphthalimide emitting moiety have been synthesized and characterized by UV-visible absorption and photoluminescence (PL). These polymers differ either by the nature of the backbone (polymethylmethacrylate PMA or polystyrene PS) or by the N-substituent. All the polymers show a green electroluminescence (EL). A bilayer diode emitted a maximum luminance as high as 7100 cd/m 2 and exhibited a maximum external quantum yield of 1%.