NEW LUMINESCENT POLYMERS FOR LEDS

Recent results are reported on the synthesis of statistical copolymers 8 and 9 derived from the highly luminescent silyl PPV derivative (DMO S-PPV) with various alternative building blocks carrying side chains c apable of supporting polyelectrolytes. These polymers are prepared by Gilch dehydrohalogenation polymerization. It is of interest to study t he effect on charge transport in standard electroluminescent (EL) devi ces using these PPV copolymers. Moderately efficient conventional sing le-layer devices are obtained for copolymer 9. When fabricated in a li ght-emitting electrochemical cell (LEG) configuration (lithium triflat e) without any extra supporting polymer electrolyte (e.g., poly(ethyle ne oxide), PEG), devices based on both 8 and 9 show lower turn-on volt ages and improved efficiency. (C) 1997 Elsevier Science S.A.