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Copolymers containing alternating flexible aliphatic blocks and rigid poly(%p%|phenylenevinylene) (PPV) blocks were synthesized and characterized. It was found that the fluorescent intensity increases with increasing length of the flexible blocks. Bright blue|light emitting diodes were fabricated using PPV copolymers as electroluminescent layers. The devices show 190 cd/m+2 light|emitting brightness at 460 nm and 15 V turn|on voltage. The effects of oxadiazole derivative PBD and tris(8|hydroxyquinoline) aluminum Alq-3 electron|transporting layers on the luminance and stability of the devices are discussed.$$$$
It was found that the fluorescent intensity increases with increasing length of the flexible blocks. Bright blue | light emitting diodes were fabricated using PPV copolymers as electroluminescent layers. The devices show 190 cd / m + 2 light | emitting brightness at 460 nm and 15 V turn | on voltage. The effects of oxadiazole derivative PBD and tris (8 | hydroxyquinoline) aluminum Alq - 3 electron | transporting layers on the luminance and stability of the devices are discussed. $$$$