New luminescent polymers for leds and LECS

Abstract

Abstract Statistical copolymers 5 containing poly(2‐dimethyloctylsilyl‐1,4‐phenylenevinylene) (DMOS‐PPV) and poly[2‐methoxy‐5‐(2′‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV) have been synthesized using the dehydrohalogenation condensation route. The copolymers show a shift of photoluminescence maxima to longer wavelengths as the proportion of the MEH‐PV unit increases. This trend is accompanied by reduced efficiencies and lower turn‐on voltages in single layer electroluminescent devices. Light‐emitting electrochemical cells (LECs) have been prepared using a blend of DMOS‐PPV 1 with poly(ethylene oxide)/lithium triflate and the homopolymer poly[2‐methoxy‐5‐(triethoxymethoxy)‐1,4‐phenylene vinylene] (MTEM‐PPV) 9 with lithium triflate. In comparison with single‐layer devices which were fabricated using the homopolymers 1 and poly[2,5‐bis(triethoxymethoxy)‐1,4‐phenylene vinylene] (BTEM‐PPV) 10 , the LEC devices showed lower turn‐on voltages.