Abstract
The electroluminescence and photoluminescence of poly( m-phenylenevinylene)-alt-( p-phenylenevinylene) green light emitting copolymers have been studied. The effect of alkoxy substitutions (–OC 4H 9 and –OC 6H 13) in single and double layer device configurations was also investigated. In double layer devices, poly( p-phenylene vinylene), PPV (60 nm) was used as a hole transport layer and substantial increase in the longevity, stability and electroluminescence efficiency of the devices was observed. Blending of green light emitting copolymers with poly( N-vinylcarbazole), PVK and [2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (butyl-PBD)] gives further promising results, namely an increase in brightness and EL efficiency of the LEDs.
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